期刊:
Journal of Environmental Management,2024年351:119729 ISSN:0301-4797
通讯作者:
Yang, Shao
作者机构:
[Peng, Kaida; Yang, Hongyan; Xu, Min; Cheng, Hu; Liu, Yi; Liu, Pan; Liu, Xiaofeng] School of Life Sciences, Central China Normal University, Wuhan, 430079, China;[Yang, Shao] School of Life Sciences, Central China Normal University, Wuhan, 430079, China. Electronic address: yangshao@ccnu.edu.cn
通讯机构:
[Yang, Shao] S;School of Life Sciences, Central China Normal University, Wuhan, 430079, China. Electronic address:
关键词:
Anthropogenic activities;Bloom-forming cyanobacterial genera;Climate change;Driving factors;Sedimentary ancient DNA;Thresholds
摘要:
Cyanobacterial blooms pose a global environmental concern, with various genera contributing to their formation. The harmfulness of cyanobacterial blooms varies depending on the specific genus, yet the factors triggering their formation remain incompletely understood. This study conducted qPCR of sediment DNA in Lake Erhai to reconstruct the historical succession of three common bloom-forming cyanobacterial genera (i.e., Microcystis, Dolichospermum, and Aphanizomenon). The driving factors and their corresponding thresholds were identified, and human activities related to driving factors were evaluated. The results revealed two successions in the past century. The first succession transitioned from Aphanizomenon (1902-1978) to Microcystis and Dolichospermum (1978-1999), driven by TN:TP and TP. The second succession shifted from Microcystis and Dolichospermum (1978-1999) to Microcystis (1999-2010), driven by TP, TN:TP, and temperature. The thresholds of TP and TN:TP for the Microcystis bloom were 0.023mg/L and 17, respectively. TN:TP was significantly influenced by domestic pollution and crop farming in both successions, while TP was significantly impacted by domestic pollution in the first succession and by pollution from crop and dairy farming in the second succession. These results shed light on the underlying mechanism responsible for the blooms of various cyanobacterial genera and could serve as a valuable reference for effectively preventing and controlling nutrient input in the watershed.
作者机构:
[Chen, Bizhong; Yao, Liangshuang] Minist Educ, Key Lab Adolescent Cyberpsychol & Behav CCNU, Wuhan, Peoples R China.;[Sun, Xiaojun] Cent China Normal Univ, Sch Psychol, Wuhan, Peoples R China.;[Huang, Xuan] Beijing Normal Univ, Fac Psychol, Beijing, Peoples R China.;[Sun, Xiaojun; Sun, XJ] Cent China Normal Univ CCNU, Sch Psychol, 382 Xiongchu Rd, Wuhan 430079, Peoples R China.
通讯机构:
[Sun, XJ ] C;Cent China Normal Univ CCNU, Sch Psychol, 382 Xiongchu Rd, Wuhan 430079, Peoples R China.
关键词:
social anxiety;social relationships;longitudinal studies;meta-analysis
摘要:
It is theoretically plausible that social anxiety (SA) and social relationships (SR) can influence each other. However, the available empirical evidence is inconsistent, leading to substantial uncertainty regarding the cross-lagged relations between SA and SR. This meta-analysis systematically integrates data from 107 longitudinal studies, comprising 110 independent samples and involving a total of 115,133 participants from childhood to adulthood. Four types of SR were assessed: family-related, school-related, romantic, and general relationships. One-stage meta-analytic structural equation modeling was applied to fit four cross-lagged panel models and to test potential moderators. No significant publication bias was detected. Effect size analyses revealed that prior SA significantly and negatively predicted quality of all types of SR. Family-related and general relationships each predicted prospective SA symptoms, but school-related and romantic relationships did not. No moderators were identified in analyses of family-related and romantic relationships. However, the publication year, sample age, gender, reporter, and time lag played a moderating role in analyses of school-related and general relationships. These findings suggest that SA is a crucial factor undermining SR and that dysfunctional family and general relationships also contribute to the exacerbation of SA symptoms. The strengths, limitations, and future directions of this study are discussed. Public Significance Statement A hotly debated issue in academia is whether past social anxiety (SA) hinders future social relationships(SR) or if prior poor SR precipitate subsequent SA symptoms. To shed light on this matter, a comprehensive meta-analysis was conducted, encompassing data from 107 longitudinal studies and involving over 110,000 participants. The findings suggest that SA poses a significant risk to all types of SR, but only family-related and general relationships potentially impacted later levels of SA.
作者机构:
[Ji Wang; Yixuan Li] Department of Electronics and Information Engineering, Central China Normal University, Wuhan, China;[Peng Zhu; Lijuan Qin; Wenwu Xie] School of Information Science and Engineering, Hunan Institute of Science and Technology, Yueyang, China;[Xingwang Li] School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo, China
关键词:
Energy splitting of STAR-RIS;time swiching of STAR-RIS;UAV-enabled outdoor-to-indoor WPCN;indoor NFZ
摘要:
This paper investigates a Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface (STAR-RIS)-assisted unmanned aerial vehicle (UAV)-enabled outdoor-to-indoor (O2I) wireless powered communication network (WPCN), in which the UAV avoids flying over the indoor no-fly zone (NFZ). In the downlink energy transfer (DET) stage, the energy-constrained STAR-RIS and the O2I Internet of Things (IoT) devices harvest energy from the radio frequency (RF) signals of the UAV to self-sustain its operation. In the uplink information transmission (UIT) stage, the IoT devices transmit information to the UAV using the harvested energy, assisted by the STAR-RIS. We introduce the STAR-RIS energy splitting (ES) and time switching (TS) operating protocols in the DET and UIT stages, respectively, to maximize the harvested downlink energy and the achievable uplink sum-rate. Further, an alternating optimization (AO) algorithm based on the penalty method and successive convex approximation (SCA) technology is proposed to solve the resulting highly-coupled non-convex optimization problems, in which the UAV trajectory based on the UAV power consumption model, resource allocation of the O2I IoT devices, and beamforming vectors of the STAR-RIS are jointly optimized. Finally, numerical results demonstrate that our proposed scheme can achieve significant system sum-rate gains that are better than other baseline schemes.
摘要:
Background: Leaderboards are a highly popular gamification component used in student learning to enhance motivation, attentional engagement, and learning performance. However, few studies have examined the effects of individual leaderboard elements on English vocabulary learning through video lectures.Objectives: The present study aimed to examine how different leaderboard elements (i.e., points and rank) may affect students' English vocabulary learning through video lectures.Methods: A total of 34 students were assigned to groups using different leaderboard elements in a counterbalanced order. Participants' motivation, eye movements, and learning performance were measured and analysed.Results and Conclusions: Students' leaderboard rank was shown to increase their motivation regardless of whether other elements were present. Eye movement tracking revealed that the presence of the leaderboard increased students' saccades between the questions and the options, and lengthened their dwell time on the learning materials while reducing their dwell time on the non-learning-related screen areas. Presenting students' rank alone also improved their learning performance.Implications: Our findings strongly support the use of video lectures for English vocabulary learning, with the following recommendations: (1) Instructors should present students' rank on the leaderboard to enhance students' motivation and engagement; (2) Instructors should present only the students' rank on the leaderboard to also enhance students' learning performance.
作者:
He, Ying;Wang, Yan;Yang, Jerry Zhijian;Yin, Hongshuang
期刊:
EAST ASIAN JOURNAL ON APPLIED MATHEMATICS,2024年 ISSN:2079-7362
通讯作者:
Wang, Y
作者机构:
[Yang, Jerry Zhijian; Yin, Hongshuang; He, Ying] Wuhan Univ, Sch Math & Stat, Wuhan 430072, Peoples R China.;[He, Ying] Yanqi Lake Beijing Inst Math Sci & Applicat, Beijing 101408, Peoples R China.;[Wang, Yan] Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.;[Wang, Yan] Cent China Normal Univ, Hubei Key Lab Math Sci, Wuhan 430079, Peoples R China.
通讯机构:
[Wang, Y ] C;Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Hubei Key Lab Math Sci, Wuhan 430079, Peoples R China.
摘要:
Numerical methods for the nonlinear Dirac equation (NDE) in the massless nonrelativistic regime are considered. In this regime, the equation contains a small dimensionless parameter 0 < epsilon <= 1, and its solution is highly oscillatory in time. We present and analyze traditional numerical schemes for the NDE, including finite difference methods, time-splitting methods and exponential integrators. Error analysis indicates that all these methods require an epsilon-dependent time-step size to achieve an optimal convergence order. Utilizing an operator splitting technique, we propose a uniformly accurate (UA) scheme. The scheme enables first-order convergence in time for all epsilon is an element of (0,1] without restrictions on time-step size. Error estimates for the UA scheme are rigorously established and numerical results confirm the properties of the method.
摘要:
Significance Statement This study has revealed an important role of OsTIL1 in maintaining the cell membrane integrity by regulating the 18:3‐containing glycerolipids biosynthesis and reducing reactive oxygen species damage under cold stress in rice seedlings. SUMMARY Lipocalins constitute a conserved protein family that binds to and transports a variety of lipids while fatty acid desaturases (FADs) are required for maintaining the cell membrane fluidity under cold stress. Nevertheless, it remains unclear whether plant lipocalins promote FADs for the cell membrane integrity under cold stress. Here, we identified the role of OsTIL1 lipocalin in FADs‐mediated glycerolipid remodeling under cold stress. Overexpression and CRISPR/Cas9 mediated gene edition experiments demonstrated that OsTIL1 positively regulated cold stress tolerance by protecting the cell membrane integrity from reactive oxygen species damage and enhancing the activities of peroxidase and ascorbate peroxidase, which was confirmed by combined cold stress with a membrane rigidifier dimethyl sulfoxide or a H2O2 scavenger dimethyl thiourea. OsTIL1 overexpression induced higher 18:3 content, and higher 18:3/18:2 and (18:2 + 18:3)/18:1 ratios than the wild type under cold stress whereas the gene edition mutant showed the opposite. Furthermore, the lipidomic analysis showed that OsTIL1 overexpression led to higher contents of 18:3‐mediated glycerolipids, including galactolipids (monoglactosyldiacylglycerol and digalactosyldiacylglycerol) and phospholipids (phosphatidyl glycerol, phosphatidyl choline, phosphatidyl ethanolamine, phosphatidyl serine and phosphatidyl inositol) under cold stress. RNA‐seq and enzyme linked immunosorbent assay analyses indicated that OsTIL1 overexpression enhanced the transcription and enzyme abundance of four ω‐3 FADs (OsFAD3‐1/3‐2, 7, and 8) under cold stress. These results reveal an important role of OsTIL1 in maintaining the cell membrane integrity from oxidative damage under cold stress, providing a good candidate gene for improving cold tolerance in rice.
作者机构:
[Wan, Qing-Yu; Li, Min; Shu, Wen-Ming; Lin, Ri-Lan; Yu, Wei-Chu; Peng, Yan-Qing] Yangtze Univ, Coll Chem & Environm Engn, Hubei Engn Res Ctr Clean Prod & Pollut Control Oil, Jingzhou 434023, Peoples R China.;[Wu, An-Xin] Cent China Normal Univ, Int Joint Res Ctr Intelligent Biosensor Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.
通讯机构:
[Shu, WM; Yu, WC ] Y;Yangtze Univ, Coll Chem & Environm Engn, Hubei Engn Res Ctr Clean Prod & Pollut Control Oil, Jingzhou 434023, Peoples R China.
摘要:
An iodine-mediated cyclization has been developed to 4-aryl-NH-1,2,3-triazoles, with p-toluenesulfonyl hydrazide and sulfamic acid used as nitrogen sources. Sulfamic acid plays a crucial role in this reaction by both acting as a substrate and providing an acidic environment. This reaction offers a metal- and azide-free strategy to access NH-1,2,3-triazoles.
作者机构:
[Shen, Bo] Division of Kinesiology, Wayne State University, Detroit, MI,USA;[Pang, Yanli; Zhang, Mingting; Xiang, Yuan; Dong, Liangshan; Song, Yu] School of Physical Education, Central China Normal University, Wuhan, HUB,China;[Bo, Jin; Lasutschinkow, Patricia; Dillahunt, Alina] Department of Psychology, Eastern Michigan University, Ypsilanti, MI,USA;[Li, Dan] LinJie Autism Rehabilitation Center, Wuhan, HUB,China
关键词:
transfer of learning;generalization;fundamental motor skills
摘要:
The current study examined the acquisition, retention, and transfer effects of a motor program. Children with autism spectrum disorder participated in a 9-week program that targeted 13 fundamental motor skills based upon the Test of Gross Motor Development-3. Assessments were conducted before and after the program, as well as at 2-month follow-up. Significant improvements were found on not only the trained fundamental motor skills (acquisition) but also the untrained tasks on balance (transfer). The follow-up tests revealed continuous improvement on the trained locomotor skills (retention), as well as the untrained skills on balance (retention + transfer). These findings highlight the importance of continuous support and long-term participation on motor practices.
作者机构:
[Li, Qian; Yan, Qiang; Yan, Q; Li, Yuntao] Zhejiang Univ, Huzhou Cent Hosp, Affiliated Huzhou Hosp, Dept Gen Surg,Sch Med, Huzhou 313000, Peoples R China.;[Li, Qian; Sun, Yao; Zhao, Fang] Cent China Normal Univ, Coll Chem, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;[Ye, Huan] Guangxi Univ, Sch Light Ind & Food Engn, Nanning 530004, Peoples R China.;[Zhang, ZP; Zhang, Zhipeng] Hubei Univ Sci & Technol, Xianning Med Coll, Coll Pharm, Xianning 437100, Peoples R China.
通讯机构:
[Zhang, ZP ] H;[Sun, Y ] C;[Yan, Q ] Z;Zhejiang Univ, Huzhou Cent Hosp, Affiliated Huzhou Hosp, Dept Gen Surg,Sch Med, Huzhou 313000, Peoples R China.;Cent China Normal Univ, Coll Chem, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.
摘要:
Bacterial infections can lead to the development of large-scale outbreaks of diseases that pose a serious threat to human life and health. Also, conventional antibiotics are prone to producing resistance and allergic reactions, and their therapeutic effect is dramatically diminished when bacterial communities form biofilms. Fortunately, well-designed supramolecular coordination complexes (SCCs) have been used as antibacterials or anti-biofilms in recent years. SCCs can kill bacteria by directly engaging with the bacterial surface through electrostatic interactions or by penetrating the bacterial membrane through the auxiliary effect of cell-penetrating peptides. Furthermore, scientists have engineered fluorescent SCCs that can produce reactive oxygen species (ROS) to eliminate bacteria when exposed to laser irradiation, and they also demonstrate outstanding performance in in vivo imaging, enabling integrated diagnosis and treatment. In this review, we summarize the design strategy and applications of SCCs in antibacterials or anti-biofilms and provide an outlook on future research.
期刊:
Journal of Hazardous Materials,2024年462:132730 ISSN:0304-3894
通讯作者:
Yang, Wen-Chao;Fang, Linchuan
作者机构:
[Ju, Wenliang] National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China;[Ju, Wenliang] School of Environment, Tsinghua University, Beijing 100084, China;[Liu, Ji] Hubei Province Key Laboratory for Geographical Process Analysis and Simulation, Central China Normal University, Wuhan 430079, China;[Liu, Ji] Department of Ecohydrology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin 12587, Germany;[Yang, Wen-Chao] National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China. Electronic address: wcyang@gzu.edu.cn
通讯机构:
[Yang, Wen-Chao] N;[Fang, Linchuan] C;National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China. Electronic address:;CAS Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an 710061, China. Electronic address:
摘要:
Revegetation is effective in improving soil quality in ecologically fragile areas. However, little is known about the impact of diverse phytomanagement strategies of tailings on soil quality and ecological security in erosion-prone areas. We investigated the water stability, soil aggregate nutrients, and the risk of heavy metal contamination of abandoned tailings under phytomanagement and in adjacent bare land on the Loess Plateau. The results showed that phytomanagement significantly enhanced soil aggregate stability, as demonstrated by higher contents of soil organic carbon (SOC), glomalin-related soil protein (GRSP), aromatic-C, and alkene-C in macro-aggregates. The pollution load index (PLI) and ecological risk index (RI) of soil heavy metals were lower in shrub/herbaceous mixed forests than in natural grasslands and planted forests. The risk of heavy metal contamination was higher in macro-aggregates (>0.25mm) than in micro-aggregates (<0.25mm) and was significantly and positively correlated with the SOC and GRSP contents of the aggregates. Our study demonstrates that soil aggregate quality is closely related to the fate of heavy metals. Diversified tailing revegetation measures can improve soil quality and ensure ecological security.
期刊:
Science of The Total Environment,2024年:167878 ISSN:0048-9697
通讯作者:
Hao, Ge-Fei
作者机构:
[Zhao, Wei; Zhang, Xiao; Gao, Yang-Yang; Huang, Yuan-Qin; Kumar, Vinit; Hao, Ge-Fei] National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang 550025, PR China;[Hao, Ge-Fei] National Key Laboratory of Green Pesticide, Central China Normal University, Wuhan 430079, PR China. Electronic address: gefei_hao@foxmail.com
通讯机构:
[Hao, Ge-Fei] N;National Key Laboratory of Green Pesticide, Central China Normal University, Wuhan 430079, PR China. Electronic address:
摘要:
Pesticides are indispensable to maintain crop quality and food production worldwide, but their use also poses environmental risks. Pesticide risk assessment involves a series of complex, expensive and time-consuming toxicity tests. To improve the efficiency and accuracy for assessing the environmental impact of pesticides, numerous computational tools have been developed. However, there is a notable deficiency in critical analysis or a systematic summary of environmental risk assessment tools and their applicable contexts. Here, many of the current approaches and tools for assessing environmental risks posed by pesticides are reviewed, and the question of whether these tools are fit for use on complex multicomponent scenarios is discussed. We analyze the adaptations of these tools to aquatic and terrestrial ecosystems, followed by the provision of resources for predicting pesticide concentrations in environmental medias, including air, soil and water. The successful application of computational tools for risk assessment and interpretation of predicted results will also be discussed. This assessment serves as a valuable resource, enabling scientists to utilize suitable models to enhance the robustness of pesticides risk assessments.
期刊:
Microwave and Optical Technology Letters,2024年66(1) ISSN:0895-2477
通讯作者:
Jin, J
作者机构:
[Ma, Li; Liu, Wei] Tianjin Univ, Sch Microelect, Tianjin, Peoples R China.;[Zhang, Qi-Jun] Carleton Univ, Dept Elect, Ottawa, ON, Canada.;[Jin, Jing] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.;[Zhang, Jianan] Southeast Univ, State Key Lab Millimeter Waves, Nanjing, Peoples R China.
通讯机构:
[Jin, J ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.
关键词:
electromagnetic;finite element method;Pade via Arnoldi;single-size simplification
摘要:
Abstract This paper proposes a new Padé via Arnoldi algorithm with single‐size matrix simplification for electromagnetic (EM) fast frequency sweep. New equations are derived to reduce the double‐size system matrix to single‐size system matrix. We also propose a systematic algorithm to calculate S‐parameters using the simplified single‐size system matrix. Using the proposed algorithm, the EM responses can be obtained with the same accuracy while consuming much less time compared with that using the existing double‐size matrix Padé via Lanczos. The proposed algorithm is demonstrated by two microwave examples.
期刊:
Concurrency and Computation: Practice and Experience,2024年 ISSN:1532-0626
通讯作者:
He, H
作者机构:
[Wu, Tong; He, Hui; Zhao, Gang] Cent China Normal Univ, Fac Artificial Intelligence Educ, Wuhan, Peoples R China.;[Di, Bingbing] Henan Univ, Fac Educ, Kaifeng, Peoples R China.
通讯机构:
[He, H ] C;Cent China Normal Univ, Fac Artificial Intelligence Educ, Wuhan, Peoples R China.
摘要:
Sharing high-quality educational resources has become an effective way to promote educational equity. The traditional educational resource sharing platforms using centralized storage architecture have security issues. Recently, many studies use blockchain to achieve secure sharing of educational resources. However, the existing blockchain-based educational resource sharing schemes only use blockchain as a storage tool, and have issues such as low sharing efficiency, without considering copyright security, and lack of a trusted sharing environment, which prevents the large-scale sharing of educational resources. In response, we propose ERSChain, a novel blockchain-based educational resources sharing solution. First, we put forward a hybrid storage method that keeps the hash value of resource in the blockchain and stores the encrypted resource in the off-chain, which can alleviate the storage and computing pressure brought by massive educational resources while ensuring the integrity of resources. Second, we construct an efficient revocable ciphertext-policy attribute-based encryption algorithm to implement flexible access control and an outsourced decryption algorithm to achieve greater efficiency. Obtaining access to educational resources is possible when user's attributes meet the access policy and the user's identity does not exist in the revocation list. Third, we put forward a credit mechanism to adjust the user's credibility and a credit-based consensus mechanism to maintain the trusted sharing environment. Finally, security analysis and plentiful of experiments demonstrate that our proposed ERSChain achieves security assurance, has better applicability than similar works, and enables large-scale sharing of educational resources.
期刊:
British Journal of Psychology,2024年 ISSN:0007-1269
通讯作者:
Zhang, Y
作者机构:
[Li, Hao; Zhang, Ying; Chen, Gaowei] Univ Hong Kong, Fac Educ, Hong Kong, Peoples R China.;[Li, Bo; Li, Na] Cent China Normal Univ, Sch Math & Stat, Wuhan, Peoples R China.;[Zhou, Xin] Sichuan Univ, Middle Sch, Chengdu, Peoples R China.;[Zhang, Ying; Zhang, Y] Univ Hong Kong, Fac Educ, Pokfulam, Hong Kong, Peoples R China.
通讯机构:
[Zhang, Y ] U;Univ Hong Kong, Fac Educ, Pokfulam, Hong Kong, Peoples R China.
摘要:
Bullying victimization can undermine adolescents' well-being. However, few studies have comprehensively investigated the contributions of various victimization forms to well-being and compared which forms were more harmful than others. Evidence on whether resilience and social support moderate such associations is also limited. Using a sample of 12,058 Chinese adolescents in the Programme for International Student Assessment (PISA) 2018, this cross-sectional study aimed to (1) investigate the associations of physical, verbal and relational victimization with well-being; (2) compare the strengths of these associations; and (3) examine the moderating roles of resilience and teacher and parent support in these associations. Results showed that three victimization forms were associated with poorer well-being. Relational and physical victimization were more harmful to most studied well-being outcomes than verbal victimization. Furthermore, resilience weakened the negative effects of physical victimization on negative affect and life satisfaction but aggravated the negative effects of verbal victimization on both outcomes and the negative effect of relational victimization on school belonging. Teacher support intensified the negative effects of physical victimization on school belonging. Parent support was not effective in regulating the victimization-well-being association. The findings underscored the detrimental effects of bullying victimization on adolescents' well-being and the potentially harmful sides of resilience and social support. Implications for bullying prevention were discussed.
期刊:
Journal of Soils and Sediments,2024年 ISSN:1439-0108
通讯作者:
Liu, Muxing;Yi, J
作者机构:
[Yi, Jun; Lu, Shiguo; Liu, Muxing; Zhang, Hailin; Liu, MX; Wang, Weijie] Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;[Yi, Jun; Lu, Shiguo; Liu, Muxing; Zhang, Hailin; Liu, MX; Wang, Weijie] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Wan, Jinhong] Inst Water Resources & Hydropower Res, Beijing 100048, Peoples R China.
通讯机构:
[Yi, J ; Liu, MX] C;Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.
关键词:
Soil infiltration response;Forest conversion;Hillslope hydrology;Humid area
摘要:
PurposeUnderstanding the characteristics of soil infiltration response to rainfall is critical for soil water transport processes and hydrologic modeling. However, little is known about how they vary with forest conversion at different temporal stages (< 20 years) below the rooting zone. Therefore, this study aims to investigate soil infiltration response patterns in different subtropical forest conversion hillslopes, including mature original forest (thick root), young secondary forest (middle root), and very young secondary grassland (fine root), and analyzed the effects of environmental factors on the dynamics of soil infiltration.Materials and methodsSeveral metrics were evaluated to characterize and quantify the nature of these responses by estimating changes in the soil water content, the response time difference between two adjacent soil depths, and infiltration velocities for 1144 infiltration events at 6 locations on the three hillslopes.Results and discussionSoil infiltration responses were similar on both forestland hillslopes, yet significantly different from those on the grassland hillslope. The preferential flow was more evident in the profile of thick-rooted vegetation, and the velocity of the wetting front was faster in the profiles of middle- and fine-rooted vegetation. Topography and root characteristics interact to influence soil infiltration response at the hillslope scale.ConclusionsConversion from thick-rooted forests into fine-rooted grasslands altered the rainfall-related soil infiltration dynamics below the rooting zone. In particular, the occurrence of preferential flow and infiltration rates varied, which helps enhance our understanding of ecohydrological processes in the context of changing land use and hydroclimatic conditions.
期刊:
Frontiers in Ecology and Evolution,2024年11:1332116 ISSN:2296-701X
作者机构:
Institute Of China Rural Studies, Central China Normal University, China;School of Public Administration, Central China Normal University, China;Mining College, Guizhou University, China
关键词:
Autumn phenology;the start of brown-down phase (SOB);the end of brown-down phase (EOB);the length of brown-down phase (LOB);Temporal Trends;temperate China
摘要:
Land surface phenology plays a crucial role in accurately parameterizing interactions between land ecosystems and the atmosphere. Changes in autumn phenology directly impact the length of vegetation growing season and year-to-year changes in carbon uptake. Previous studies have often focused solely on the end of growing season when characterizing autumn phenology, neglecting the onset and duration of autumn. Here, we extracted the annual autumn phenological metrics, i.e., the start of brown-down phase (SOB), the end of brown-down phase (EOB), and the length of brown-down phase (LOB), for temperate China from 1982 to 2018 based on our self-developed global LSP dataset. We conducted a comparative analysis of SOB, EOB, and LOB in the field of their spatial distribution, temporal trends, and performance on various categories of vegetated regions (i.e., forests, grasslands, croplands, and vegetated areas in urban lands (V_Urban)). The results showed a significant negative correlation between the timing of autumn phenological metrics and latitude in temperate China. Between 1982 and 2018, there were significant positive increasing trends in EOB and LOB in V_Urban, as well as in LOB in forests in temperate China. However, the annual mean SOB, EOB, and LOB did not show significant trends across the entire study area. At the local pixel scale, SOB, EOB, and LOB exhibited a combination of advanced and delayed trends within various vegetated categories. The trends of the same phenological metric were not uniform across these diverse vegetated regions. For instance, the majority of pixels with significant trends in SOB exhibited delayed trends in forests and croplands, while displaying advanced trends in grasslands and V_Urban. In this study, employing three metrics (SOB, EOB, and LOB) to describe autumn phenology enhances our understanding of the impacts of global climate change on ecosystems, offering a more comprehensive and detailed perspective. In the future, satellite-based monitoring and phenological modeling should contemplate incorporating additional potential phenological metrics.