作者：
Wu, Tieniu;Cheng, Antai;Lin, Henry;Zhang, Hailin;Jie, Yi
期刊：
地球科学学刊,2023年34(5):1556-1566 ISSN：1674-487X
通讯作者：
Wu, TN
作者机构：
[Cheng, Antai; Wu, Tieniu; Jie, Yi; Zhang, Hailin] Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei Province, Peoples R China.;[Lin, Henry; Wu, Tieniu] Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA.;[Cheng, Antai; Wu, Tieniu; Jie, Yi; Zhang, Hailin] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, TN ] C;Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei Province, Peoples R China.;Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA.;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.
关键词：
MIS 9;climatic fluctuation;Paleosol;S3;Chinese Loess Plateau;environmental geology
摘要：
Marine Isotope Stages (MIS) 9 has been proposed as an analog for the present warm period. However, detailed studies of this geological time period are rare in loess-paleosol sequence. In the Chinese Loess Plateau (CLP), the corresponding stratum is the third paleosol layer (S3). Here, we report the terrestrial reconstruction of climatic fluctuations during MIS 9 by analyzing the paleo-climate indexes of S3 with high sampling density. Our results showed that: (1) During the period of MIS 9, the main climatic sub-cycle was 29 ka; (2) MIS 9 could be divided into five sections, MIS 9a, 9b, 9c, 9d, and 9e. Among them, MIS 9a, 9c, and 9e were warm stages, while MIS 9b and 9d were cool intervals; and 3) There were also three swift warm-wet events and one cool-dry event, which occurred around 332-331, 324-323, 311-310, and 331-329 ka BP, respectively. The overall trend of paleo-climate fluctuation correlated approximately with SPECMAP, LR04 stack and Iberian margin deep-sea cores. This study suggested that the paleosol records in the southern margin of the CLP have global significance and contain more detailed climatic signals than marine deposits.
作者机构：
[Liu, Weihang; Sun, Ran; Li, Yan; Chen, Shuo; Li, Zitong; Ye, Tao; Liu, Yiqing] Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol E, Beijing, Peoples R China.;[Liu, Weihang; Sun, Ran; Chen, Shuo; Li, Zitong; Ye, Tao; Liu, Yiqing] Beijing Normal Univ, Key Lab Environm Change & Nat Disasters, Minist Educ, Beijing, Peoples R China.;[Liu, Weihang; Sun, Ran; Chen, Shuo; Li, Zitong; Ye, Tao; Liu, Yiqing] Minist Educ, Minist Emergency Management, Acad Disaster Reduct & Emergency Management, Beijing, Peoples R China.;[Liu, Weihang; Sun, Ran; Chen, Shuo; Li, Zitong; Ye, Tao; Liu, Yiqing] Beijing Normal Univ, Fac Geog Sci, Beijing, Peoples R China.;[Li, Yan] Beijing Normal Univ, Inst Land Surface Syst & Sustainable Dev, Fac Geog Sci, Beijing, Peoples R China.
通讯机构：
[Ye, T ] B;Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol E, Beijing, Peoples R China.;Beijing Normal Univ, Key Lab Environm Change & Nat Disasters, Minist Educ, Beijing, Peoples R China.;Minist Educ, Minist Emergency Management, Acad Disaster Reduct & Emergency Management, Beijing, Peoples R China.;Beijing Normal Univ, Fac Geog Sci, Beijing, Peoples R China.
摘要：
Understanding how crop phenology responds to climate change is critical for enabling agricultural adaptation measures. Pre-season temperature alone leads to well-understood changes in crop phenology. Nevertheless, the modulation effect of concurrent precipitation extremes on the response to temperature extremes has been largely under-addressed. Here, we investigate the response of rice transplanting dates to pre-season temperature extremes and reveal the modulation effects of concurrent precipitation extremes by using station-observed rice transplanting dates from 1981 to 2018 across mainland China. We also evaluate the performance of a remotely sensed phenology product, ChinaCropPhen1km, in reproducing the above temperature responses and modulation effects. Our results showed that transplanting dates tended to advance in response to an extremely hot pre-season, while concurrent extreme drought offset the advance by up to 2.6 days. Transplanting dates tended to be delayed in response to an extremely cold pre-season, while concurrent extreme precipitation exacerbated the delay by up to 1 day. Responses to temperature extremes and modulation effects were divergent across different regions. Under extremely hot conditions, transplanting dates advanced further in hotter and wetter regions, while under extremely cold pre-seasons, transplanting dates delayed less in colder and drier regions. Transplanting dates from the ChinaCropPhen1km product underestimated the responses to temperature extremes by up to 4.7 days and detected the opposite modulation effect compared to those obtained from observations. Our results highlight that the need to improve our understanding and modeling of modulation effects of precipitation extremes on temperature–phenology relationship, which benefits the field of agriculture risk analysis and climate change adaptation.
Concurrent extreme drought offset the extreme hot induced-advance, and extreme precipitation exacerbate the extreme cold induced-delay
Responses to temperature extremes and modulation effects of precipitation extremes are divergent across regions
Remotely sensed transplanting dates from ChinaCropPhen1km underestimate the responses to temperature extremes and modulation effects
Frequent climate extremes are projected with ongoing climate change. This paper reveals the effect of concurrent precipitation extremes in modulating rice transplanting date response to pre-season temperature extremes in China and assesses remotely sensed transplanting dates from the ChinaCropPhen1km product in reproducing the above temperature responses and modulation effects. Results show that concurrent precipitation extremes substantially influence the temperature–transplanting date relationship. Two kinds of modulation effects are detected: (a) concurrent extreme precipitation tends to exacerbate the extremely cold-induced delay by up to 1 day, and (b) concurrent extreme drought conditions tend to offset the extremely hot-induced advance by up to 2.6 days. From a spatial perspective, responses to temperature extremes and modulation effects are divergent across regions. Additionally, remotely sensed transplanting dates from the ChinaCropPhen1km product underestimate the temperature responses and detect the opposite modulation effects compared to observations. This study highlights the critical role of concurrent precipitation extremes in modulating temperature impact on crop phenology, which requires more understanding and modeling in future analysis.
作者机构：
[Zhang, Juan; Chen, Dong; Liu, Zhaojun; Xiong, Kangning; Gu, Xinyan; Zhang, Ning] Guizhou Normal Univ, Sch Karst Sci, Guizhou Engn Lab Karst Desertificat Control & Ecoi, Guiyang 550001, Peoples R China.;[Zhang, Juan; He, Lixiang] Guizhou Univ Finance & Econ, Sch Management Sci & Engn, Guiyang 550025, Peoples R China.;[He, Lixiang] Cent China Normal Univ, Sch Urban & Environm Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Xiong, KN ] G;Guizhou Normal Univ, Sch Karst Sci, Guizhou Engn Lab Karst Desertificat Control & Ecoi, Guiyang 550001, Peoples R China.
关键词：
Natural World Heritage;Buffer zone;Conservation;Tourism;Coupling coordination;Libo-Huanjiang Karst
摘要：
Karst World Heritage Site (KWHS) combines high-grade landscape resources and a fragile ecological environment. As an essential tool for heritage conservation and maintaining local interests, its buffer zone is primarily located in remote villages, a crucial and challenging area for rural revitalization. The conflict between heritage conservation and development is particularly acute at the site. How to deal with the relationship between the heritage site's OUV conservation and the buffer zone's tourism industry development and realize the synergy between the two subsystems? Few studies have focused on it. There is an urgent need to explore the synergistic mechanism of the KWHS's OUV conservation and the buffer zone's tourism industry development. Accordingly, this study takes the Libo-Huanjiang KWHS, one of the 'South China Karst' series of heritage sites, as a case study. The coupling coordination degree model, gray correlation analysis (GCA), and Geographic Information System (GIS) spatial analysis are used. The results show that: (1) There is a synergistic effect between the Libo-Huanjiang KWHS's OUV conservation and its buffer zone's tourism industry development, showing a favorable trend. The mean value of the coupling coordination degree increased from 0.57 in 2015 to 0.63 in 2020, and the overall situation improved from barely coupling coordination state to primary coupling coordination. (2) Influenced by the main driving factors, such as NDVI, landscape dominance, government support for tourism development, tourists' satisfaction, and residents' support, the coupling coordination of the four tourist scenic areas in the study area differed slightly in 2015 and 2020. Yaoshan Ancient Village Scenic Area is the highest in both years, increasing from 0.69 to 0.81, followed by the Mengliu Buyi Scenic Area (0.59), Wanmu Meiyuan Scenic Area is relatively stable with a slight increase, and Lianshanwan Scenic Area (0.45) is the lowest. (3) The four dimensions of ecological resources, policy drivers, economy drivers, and social facilitators work together to create a synergistic mechanism between the KWHS's OUV conservation and the buffer zone's tourism industry development. Future research can promote synergy between the two by formulating a comprehensive plan, encouraging sustainable tourism, establishing a diversified tourism industry, strengthening heritage education and training, enhancing community participation, and reinforcing stakeholder cooperation.
期刊：
ISPRS Journal of Photogrammetry and Remote Sensing,2023年205:34-49 ISSN：0924-2716
通讯作者：
Hu, Q
作者机构：
[Xu, Baodong; Shi, Zhihua; Cai, Zhiwen] Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China.;[Hu, Q; Hu, Qiong; Yang, Jingya] Cent China Normal Univ, Coll Urban & Environm Sci, Hubei Prov Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei, Peoples R China.;[Zhang, Xinyu; You, Liangzhi; Wei, Haodong] Huazhong Agr Univ, Macro Agr Res Inst, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China.;[Li, Wenjuan; Yang, Jingya] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arid & Semi arid, Beijing 100081, Peoples R China.;[Zeng, Yelu] China Agr Univ, Coll Land Sci & Technol, Beijing 100083, Peoples R China.
通讯机构：
[Hu, Q ] C;Cent China Normal Univ, Coll Urban & Environm Sci, Hubei Prov Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei, Peoples R China.
关键词：
Agricultural field parcel delineation Deep learning Multimodal satellite data Spatiotemporal fusion Spatial transferability
摘要：
Accurate spatial information for agricultural field parcels is important for agricultural production management and understanding agro-industrialization and intensification. However, traditional remote sensing methods that rely on single-modal or single-date data struggle to identify heterogeneous field parcels, particularly in regions dominated by smallholder farming systems. To address this challenge, we proposed a Dual branch Spatiotemporal Fusion Network (DSTFNet) that integrated very high-resolution (VHR) images and medium-resolution satellite image time series (MRSITS) to extract agricultural field parcels over various landscapes. The DSTFNet consisted of two branches: a spatial branch that extracted spatial features from VHR images and a temporal branch that explored seasonal spectral dynamics from MRSITS data by using ConvLSTM units and an attention module. We evaluated the DSTFNet in four regions across China by using GF-2 and Sentinel-2 data. The results showed that DSTFNet performed well in delineating agricultural field parcels, achieving the highest Matthew's correlation coefficient (MCC) = 0.823 for the field extent, the highest F1-score of edge (Fedge) = 0.865 for field boundary, and the lowest errors of segmentation evaluation index (SEI) = 0.191 for the vectorized field parcels in Hubei province. In addition, DSTFNet significantly outperformed two single-branch models that used VHR or MRSITS alone, as well as existing BsiNet, ResUNet_a, UNet and RAUNet models. DSTFNet also showed good spatial transferability in distinct regions without training data (on average, MCC = 0.728, Fedge = 0.729, and SEI = 0.281 for three target regions). Using limited training data to fine-tune the DSTFNet can further improve its ability to delineate field parcels over complex regions. The visualization analysis of temporal attention weights demonstrated that DSTFNet can well capture cropland spectral dynamics, making it advantageous in extracting diverse cropland parcels. By exploiting important spectral, spatial and temporal information from multimodal satellite data, DSTFNet provided an effective, robust, and transferable solution for accurately delineating agricultural field parcels across heterogeneous farming systems.
期刊：
Global Change Biology,2023年29(5):1377-1389 ISSN：1354-1013
通讯作者：
Yongshuo H. Fu<&wdkj&>Fanghua Hao<&wdkj&>Yongshuo H. Fu Yongshuo H. Fu Yongshuo H. Fu<&wdkj&>Fanghua Hao Fanghua Hao Fanghua Hao
作者机构：
[Zhang, Xuan; Chen, Shouzhi; Zhang, Jing; Wu, Zhaofei; Geng, Xiaojun; Fu, Yongshuo H.] Beijing Normal Univ, Coll Water Sci, Beijing 100875, Peoples R China.;[Geng, Xiaojun] Minist Water Resources, Gen Inst Water Resources & Hydropower Planning &, Beijing, Peoples R China.;[Hao, Fanghua; Wu, Hao] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Tang, Jing] Lund Univ, Dept Phys Geog & Ecosyst Sci, Lund, Sweden.;[Tang, Jing] Univ Copenhagen, Dept Biol, Terr Ecol Sect, Copenhagen, Denmark.
通讯机构：
[Yongshuo H. Fu; Fanghua Hao; Yongshuo H. Fu Yongshuo H. Fu Yongshuo H. Fu; Fanghua Hao Fanghua Hao Fanghua Hao] C;College of Water Sciences, Beijing Normal University, Beijing, China<&wdkj&>College of Urban and Environmental Sciences, Central China Normal University, Wuhan, China
关键词：
autumnal foliar senescence;climatic warming;green season;spring leaf-out;thermal season
摘要：
Global warming leads to substantial changes in the thermal conditions for vegetative growth. Based on in situ and remote sensing‐based phenological observations, we show that global warming is extending both the thermal (potential) and green (actual) season of temperate deciduous trees, but green season extensions lag behind the thermal season by 7.9–11.1 days and this mismatch was mainly driven by tree's leaf‐out dates did not follow proportionately the strong advance in the thermal season onset. Our results call for caution when using thermal sums to predict future changes in plant vegetative growth or any processes involving plant development. Abstract Over the past decades, global warming has led to a lengthening of the time window during which temperatures remain favorable for carbon assimilation and tree growth, resulting in a lengthening of the green season. The extent to which forest green seasons have tracked the lengthening of this favorable period under climate warming, however, has not been quantified to date. Here, we used remote sensing data and long‐term ground observations of leaf‐out and coloration for six dominant species of European trees at 1773 sites, for a total of 6060 species–site combinations, during 1980–2016 and found that actual green season extensions (GS: 3.1 ± 0.1 day decade−1) lag four times behind extensions of the potential thermal season (TS: 12.6 ± 0.1 day decade−1). Similar but less pronounced differences were obtained using satellite‐derived vegetation phenology observations, that is, a lengthening of 4.4 ± 0.13 and 7.5 ± 0.13 day decade−1 for GS and TS, respectively. This difference was mainly driven by the larger advance in the onset of the thermal season compared to the actual advance of leaf‐out dates (spring mismatch: 7.2 ± 0.1 day decade−1), but to a less extent caused by a phenological mismatch between GS and TS in autumn (2.4 ± 0.1 day decade−1). Our results showed that forest trees do not linearly track the new thermal window extension, indicating more complex interactions between winter and spring temperatures and photoperiod and a justification of demonstrating that using more sophisticated models that include the influence of chilling and photoperiod is needed to accurately predict spring phenological changes under warmer climate. They urge caution if such mechanisms are omitted to predict, for example, how vegetative health and growth, species distribution and crop yields will change in the future.
作者机构：
[Liu, Ji; Liu, Muxing; Zhang, Hailin; Yi, Jun] Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei, Peoples R China.;[Liu, Ji; Wang, Qiuyue; Liu, Muxing; Zhang, Hailin; Yi, Jun] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Hu, Wei] New Zealand Inst Plant & Food Res Ltd, Private Bag 4704, Christchurch 8140, New Zealand.
通讯机构：
[Jun Yi] K;Key Laboratory for Geographical Process Analysis & Simulation, Hubei Province, Wuhan, 430079, China<&wdkj&>College of Urban and Environmental Sciences, Central China Normal University, Wuhan, 430079, China
关键词：
Volumetric soil water content;Wavelet analysis;Significant coherence area;Time scale;Vegetation type;Slope position
摘要：
Clarifying the mechanisms governing volumetric soil water content (VSWC) dynamics in soil profiles is essential, as it can help to elucidate soil water transport processes and improve the prediction accuracy of soil hydrological processes. Using Spearman's rank correlation and wavelet coherence analysis methods, similarity in soil profile VSWC dynamics and factors governing VSWC soil profile dynamics in upslopes and downslopes under three vegetation types (evergreen forest [EG], secondary deciduous forest mixed with shrubs [SDFS], and deforested pasture [DP]) at different time scales (hourly, daily, weekly, and monthly) and in different seasons were analyzed. The results revealed significant similarity in the VSWC of different soil depths (P < 0.01), with the similarity decreasing in accordance with the increment in soil depth. Greater VSWC similarity was found in EG than SDFS and DP sites and in upslope than downslope areas at both forest sites. The average significant coherence area (SCA) of VSWC similarity among surface and deep soil layers varied with the time scale, which was in the order of monthly (58.6%) > weekly (42.8%) > daily (21.8%). The effects of soil properties (e.g., texture, saturated hydraulic conductivity), rainfall, and potential evapotranspiration (ETp) on VSWC similarity were related to the time scale and season in which VSWC monitoring took place. Soil properties had apparent effects on VSWC similarity at longer time scales (i.e., monthly), with a high SCA. In contrast, the effects of rainfall and ETp on VSWC similarity were concentrated at weekly and daily scales, with a relatively low SCA. Rainfall and ETp dominated VSWC dynamics in the summer and fall, respectively. These results imply the use of measured VSWC at one soil depth to predict the VSWC at other soil depths was a reliable method. While the in-fluence of time scale effects and seasonal variations on prediction accuracy of VSWC should be considered. ](c) 2022 International Research and Training Center on Erosion and Sedimentation, China Water and Power Press, and China Institute of Water Resources and Hydropower Research. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY -NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
摘要：
Abstract: The fast development of urban built-up areas in China is causing many problems, such as pollution, congestion, etc. How to effectively evaluate the coordination between urban areas and environmental problems has been attracting many scholars worldwide. This paper intends to discover this “secretary” through investigating the built-up areas and their accompanied economic and environmental factors over almost 30 years (1992 to 2020) in Nanjing, China. DMSP/OLS nighttime lights images from 1992 to 2013 and the NPP/VIIRS nighttime lights images from 2012 to 2022 are used for extraction of built-up areas. A spatiotemporal evolution model is established to evaluate whether the built-up areas have developed in coordination and the relationship between urban built-up areas and various factors, including compactness, the fractal dimension, boundary and shape changes, exhaust emissions, and the production of general industrial solid waste, which was further investigated to ascertain whether there was coordination or not. The investigated results discovered that Nanjing’s built-up areas had maintained continuous growth from 1992 to 2020, with the compactness of built-up areas gradually decreasing from 0.42 to 0.23 and the built-up differentiation dimension changing from 1.31 to 1.39, demonstrating that built-up areas had gradually moved from a loose pattern to a compact pattern and from irregular development to balanced development in all directions. The macro model of the coordination index change trend is 0.847 from 1995 to 2020, which indicates that the coordination between urban built-up areas of development and their environments has been improving; however, the reduction in urban green space, the increase in waste emissions, and the increased production of general industrial solid waste has raised questions regarding sustainable development. Keywords: nighttime light image; spatiotemporal analysis; urban built-up areas; coordination; environmental factors; Nanjing
作者机构：
[Xueling, Tan; Hu, Yu] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China.;[Yinhe, Li; Xueling, Tan] Yanbian Univ, Sch Geog & Ocean Sci, Yanbian, Peoples R China.;[Yajuan, Li] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan, Peoples R China.
通讯机构：
[Yu Hu] I;Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
关键词：
Glocalization;food cultural space;production;reconstruction;China
摘要：
This study constructs a theoretical framework for the production and reconstruction of food cultural space from a glocalization perspective. Through a qualitative analysis, we analyse the practice and representation of food cultural space in Yanji City. The results show that food cultural spaces have evolved from commercial residential to open urban leisure consumption spaces through a leap from a quantitative to a qualitative change.It integrates fashionable cultural consumption elements into the optimisation and expression of urban space extension, thus achieving the spatial image of symbolic communication. As the representational space of residents’ daily life, the evolution of food cultural space is accompanied by capital multiplication, power cultivation, and class mobility, which play an important role in promoting urban space expansion and social structure renewal. The results enrich the research on food cultural space under the background of glocalisation and provide a reference for the sustainable development of urban cultural space.
