期刊：
Journal of Environmental Management,2023年327:116880 ISSN：0301-4797
通讯作者：
Guangming Yu
作者机构：
[Gu, Yinxue; Xu, Lili; Zhang, Chenlei; Chen, Xiaoxu; Yu, Guangming; Tu, Zhenfa] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Yu, Guangming] Kashi Univ, Coll Life & Geog Sci, Kashi 844000, Peoples R China.;[Xu, Lili; Tu, Zhenfa] Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;[Yang, Jian] Hubei Univ Arts & Sci, Fac Resource Environm & Tourism, Xiangyang 441053, Peoples R China.
通讯机构：
[Guangming Yu] C;College of Urban and Environmental Sciences, Central China Normal University, Wuhan, 430079, China<&wdkj&>College of Life and Geographic Sciences, Kashi University, Kashi, 844000, China
关键词：
Citizen water use;Han river basin;SHRD model;Water accessibility;Water price
摘要：
Water resource, with properties of scarcity, is one of the vital resource endowments. Like land resources, the prices of these resource endowments should be correlated to their locations to follow fair and reasonable principles. The current water price systems are mainly policy-oriented fixed regimes. And the water use was charged according to the regional-average situation with scarce consideration of the fine-scale geographical water accessibility. With a combination of the water accessibility and the current water pricing regime, this paper first proposed a novel water pricing model, the Water Price at Grid-scale (WPG) model, to dynamically allocate water prices to fine grids for urban residents. The WPG model was examined in the case study of the Han River Basin in the Hubei province of China. The specific results were: (1) the P(grid) of Tier I is between 0.66 and 3.94 yuan/m³, the P(grid) of Tier II is between 0.57 and 5.44 yuan/m³, and the P(grid) of Tier III is between 0.47 and 6.94 yuan/m³ in the study area. (2) the grids with more water acquisition generally have lower water prices than others and vice versa. (3) the average water prices in tiers obtained by the WPG model are generally higher than that derived from the current water pricing system. The results proved that the proposed WPG model spatially allocates the three-tier water prices into grids of urban areas. The WPG framework can be adopted in any society by involving its water price regimes and adjusting the scale of grids and the pricing year. This study provided a new viewpoint of domestic water pricing involving fine-scale water accessibility. The WPG model has great potential to ease water shortage pressure in water-limited societies and can be utilized and loaded into the current smart-city network for efficient and fine-scale water resource management.
作者机构：
[Xu, Baodong; Wei, Haodong; Xu, Zilu; Yang, Jingya; Cai, Zhiwen] Huazhong Agr Univ, Macro Agr Res Inst, Coll Resources & Environm, Wuhan 430070, Peoples R China.;[Hu, Qiong; He, Zhen] Cent China Normal Univ, Coll Urban & Environm Sci, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;[You, Liangzhi] Huazhong Agr Univ, Coll Econ & Management, Wuhan 430070, Peoples R China.;[You, Liangzhi] Int Food Policy Res Inst, 1201 1 St NW, Washington, DC 20005 USA.;[Chen, Yunping] Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China.
通讯机构：
[Baodong Xu] M;Macro Agriculture Research Institute, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China<&wdkj&>State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Aerospace Information Research Institute, Chinese Academy of Sciences and Beijing Normal University, Beijing, 100101, China
关键词：
Ratoon rice;Potential northern limits;Potential planting areas;Climate conditions;MaxEnt model
摘要：
Ratoon rice has emerged as a promising rice cropping system to improve grain production and reduce labor costs compared with traditional single/double rice in China. However, the potential planting areas of ratoon rice in China remain unclear. This research investigated the potential northern limits and promotion extent of ratoon rice in China by considering its climatic suitability based on the optimized maximum entropy (MaxEnt) model as well as terrain and land use conditions. The MaxEnt model derived by all environmental variables yielded a good performance, with average AUC (area under the curve) and TSS (true skill statistic) over the validation dataset of 0.940 and 0.825, respectively. The comparison with field samples and previous studies revealed the reliability of the derived potential promotion areas. Potential northern limits contained a closed curve surrounding the Sichuan Basin, and the other curve ran from Yunnan Province to Jiangsu Province. Safe promotion areas of ratoon rice in China were 472,003 km2, mainly located in Sichuan, Hubei, Guangxi and Hunan. Risky promotion areas were 74,150 km2, which were dominant in Henan, Anhui and Yunnan. Our study provides crucial infor-mation for rice planting pattern adjustment to alleviate national food insecurity caused by the loss of double rice.
作者机构：
[Fu, Yongshuo H.; Xiao, Yi] Beijing Normal Univ, Coll Water Sci, Beijing 100875, Peoples R China.;[Hao, Fanghua; Guo, Yahui; Chen, Jiahao; Nie, Xingyu; Li, Xiran; Xu, Yue; Guo, Shihui] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Fu, YH ] B;Beijing Normal Univ, Coll Water Sci, Beijing 100875, Peoples R China.
关键词：
High spatial resolution;Optical Satellite;Inland waters;Chlorophyll-a;Suspended sediment;Unmanned aerial vehicle (UAV)
摘要：
In recent decades, phytoplankton proliferation and sediment input to rivers (especially urban rivers) have become more dramatic under the compound pressure of climate change and human activities. Given the generally narrow width of rivers and current high spatial resolution satellites, which are limited by band settings, bandwidth, and the signal-to-noise ratio, UAVs with their exceptional spatiotemporal resolution can be used as a useful tool for river environmental monitoring and inversion uncertainty assessment. In this study, UAV-based hyperspectral (X20P) and multispectral (P4M) images, along with Sentinel-2 MultiSpectral Instrument (MSI), Landsat-8 Operational Land Imager (OLI) and Landsat-9 OLI2 data, were used to assess the uncertainty in retrieving chlorophyll-a (Chla) and suspended sediment (SS) concentrations in rivers. Chla and SS models based on UAV and satellite data were constructed using stepwise multiple regression and typical Chla and SS retrieval algorithms, respectively, and the performance of the models was the focus of our research. The results demonstrated that in the Chla concentration inversion, each sensor performed as follows: X20P > P4M > Landsat9 OLI2 > Sentinel-2 MSI > Landsat8 OLI, and the performance in the SS concentration inversion was as follows: X20P > Sentinel-2 MSI > P4M > Landsat9 OLI2 > Landsat8 OLI. In addition, the uncertainty of high spatial resolution satellite retrievals was analyzed with the assistance of the UAV-based model. Results showed that narrow bandwidths and finely tuned band settings are more essential for the Chla inversion. The typical Chla retrieval algorithm, NDCI, is only effective in certain bands (band 1 from 684 to 724 nm and band 2 from 660 to 680 nm). It is also noted that Landsat8 and Landsat9 lack some key band settings (e.g., the red-edge band of 700-710 nm), severely limiting practical application in relation to Chla. However, specific variances in different sensor bands have a relatively small impact on SS inversion, for example, the correlation between SS and the R/B (a typical SS retrieval algorithm) constructed by each sensor ranged from 0.68 to 0.77. Chla monitoring, on the other hand, necessitates a higher spatial resolution than SS monitoring. The accuracy decreased markedly when UAV images were resampled to 10 m and 30 m spatial resolution. However, it is not as crucial for the SS inversion, images with the original spatial resolution (RMSE<30cm = 6.28 mg/L) were resampled to 10 m resolution (RMSE10m = 5.85 mg/L) and 30 m resolution (RMSE30m = 4.08 mg/L) while using P4M for SS inversion, and the accuracy increased. Our results demonstrated and highlighted various options for future monitoring of Chla and SS, while exploiting the synergy between UAVs and satellites to achieve more precise observations at greater spatial and temporal scales, which will benefit aquatic environment management and protection.
作者机构：
[Zheng, Wensheng; Xiong, Yajun; Wang, Xuzheng; Wang, Xiaofang; Zhou, Ying] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Zheng, Wensheng; Wang, Xiaofang] China Tourism Acad, Wuhan Branch, Wuhan 430079, Peoples R China.;[Zheng, Wensheng] Cent China Normal Univ, Hubei High qual Dev Inst, Wuhan 430079, Peoples R China.
通讯机构：
[Wensheng Zheng] C;College of Urban and Environment Science, Central China Normal University, Wuhan, China<&wdkj&>Wuhan Branch of China Tourism Academy, Wuhan, China<&wdkj&>Hubei High-quality Development Institute, Central China Normal University, Wuhan, China
作者机构：
[Fang, Jian; Tao, Kai] Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;[Fang, Jian; Tao, Kai] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Yang, Wentao] Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China.;[Fang, Jiayi] Hangzhou Normal Univ, Inst Remote Sensing & Earth Sci, Sch Informat Sci & Technol, Hangzhou 311121, Peoples R China.;[Fang, Jiayi] Hangzhou Normal Univ, Zhejiang Prov Key Lab Urban Wetlands & Reg Change, Hangzhou 311121, Peoples R China.
关键词：
Flood;Compound event;Extreme precipitation;Middle Yangtze River
摘要：
The potential damages of flood would be magnified by the compounding effect of local heavy rainfall and extreme river flow from upstream/downstream, which has brought significant challenges to traditional flood risk management. To better understand the risk of these compound extreme events, we used the latest datasets to characterize compound inland floods in the middle Yangtze River region. The frequency, intensity, duration, timing, and dependence of the compound events from heavy rainfall in Wuhan and upstream–downstream floods in the Dongting Lake and Poyang Lake Basin were investigated from 1980 to 2020. In addition, we explored the effects of different compounding scenarios and discussed the synoptic and topographic conditions for these events. The results show that the frequency, intensity, and duration of all compound events had increased significantly after 2004; the occurrence time of most compound events had become more concentrated and advanced slightly in 2004–2020. Significantly positive correlation between extreme precipitation and corresponding upstream river flow and downstream water level were found, and the correlation became stronger in 2004–2020. The favorable synoptic and topographic conditions in this area make it prone to compound floods, and the influence from the concurrence with downstream flood was more profound than the concurrence with upstream flood. Higher risk of compound floods could be expected, given the increase in the drivers and their dependence in future, highlighting the necessity of more comprehensive study toward the mechanism, dynamics and risk of compound floods and more systematic strategies for flood risk management.
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.
摘要：
Accurate geographic data of slums are important for handling urban poverty issues. Previous slum mapping studies using high-resolution or very-high-resolution (HR/VHR) remotely sensed (RS) images are commonly not suitable for city-wide scale tasks. This study aims to efficiently generate a slum map on a city-wide scale using freely accessed multispectral medium-resolution (MR) Sentinel-2 images. Composite slum spectral indices (CSSIs) were initially proposed based on the shapes of spectral profiles of slums and nonslums and directly represent slum characteristics. Specifically, CSSI-1 denotes the normalized difference between the shortwave infrared bands and the red edge band, while CSSI-2 denotes the normalized difference between the blue band and the green band. Furthermore, two methods were developed to test the effectiveness of CSSIs on slum mapping, i.e., the threshold-based method and the machine learning (ML)-based method. Experimental results show that the threshold-based method and the ML-based method achieve intersection over unions (IoU) of 43.89% and 54.45% in Mumbai, respectively. The accuracies of our methods are comparable to or even higher than the accuracies reported by existing methods using HR/VHR images and transfer learning. The threshold-based method exhibits a promising performance in mapping slums larger than 5 ha, while the ML-based method refines mapping accuracies for slum pockets smaller than 5 ha. The threshold-based method and the ML-based method produced the slum map in Mumbai in 2 and 28 min, respectively. Our methods are suitable for rapid large-area slum mapping owing to the high data availability of Sentinel-2 images and high computational efficiency.
摘要：
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.
关键词：
Gully erosion;Soil depth;Area of collapsing wall;Erosion rate
摘要：
Gully erosion, a spectacular erosional landform in the hilly areas of southern China, poses an enormous threat to local sustainable economic development and ecological security. The depth of granite weathering mantle in-creases from north to south, which is consistent with the increase of gully density and accelerated soil loss. However, the spatial distribution of soil depth in gully areas remains unclear. Herein, soil depth was measured by field sampling investigation, and soil depth mapping was established using the Fuzzy c-means algorithm. To explore the relationship between soil depth and gully erosion rate, gully characteristics and erosion process were monitored by unmanned aerial vehicle. The results showed that the gully density increased from Tongcheng (29 degrees 2 & PRIME;- 29 degrees 24 & PRIME; N) to Wuhua (23 degrees 23 & PRIME;- 24 degrees 12 & PRIME; N) in the range of 11.25-61.75 gullies/km2, in contrast to an opposite trend in the soil depth range from 180 to 5 cm. Additionally, soil depth mapping by fuzzy c-means algorithm performed well in gully areas, with overall accuracy, Pearson correlation coefficient, and agreement coefficient reaching 81.60%, 0.90, and 0.97, respectively. Moreover, the gully erosion rate in the range of 7.60-29.08 m3 yr.-1 had a significant positive linear relationship with the area of collapsing wall (R2 = 0.54, p < 0.05). Based on this relationship, a power function was established between soil depth and gully erosion rate (R2 = 0.41, p < 0.01), which provides a possibility for effective prediction of gully erosion. This study facilitates a better understanding of the gully erosion mechanism and its effective control.
作者机构：
[Liu, Fang] Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China.;[Qin, Tianling; Liu, Shanshan; Wang, Hao] China Inst Water Resources & Hydropower Res IWHR, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China.;[Nie, Hanjiang] Cent China Normal Univ, Sch Urban & Environm Sci, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Peoples R China.;[Wang, Jianwei] Yellow River Inst Hydraul Res, 45, Shunhe Rd, Zhengzhou 450003, Peoples R China.
通讯机构：
[Tianling Qin] S;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research (IWHR), Beijing 100038, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
landscape structure;configuration;landscape characteristic index;river water quality;scale effect;slope
摘要：
Landscape composition and configuration determine the source of pollutants. They also determine the interception and pollution-holding potential of the surface landscape. Using the upper reaches of the Si River Basin, a major grain-producing region in Shandong province in east-central China, as a case study, this study analyzed the influence of landscape characteristics on river water quality (RWQ) after superimposing topographic slope factors for 2017, and investigated which spatial scale had the strongest influence on RWQ. The landscape indices of three spatial scales (riparian zone, river reach and sub-catchment) and three slope scales (general land, flat ground and steep slope) were extracted. Correlation analysis and redundancy analysis were used to reveal the effects of landscape characteristics on RWQ at different scales. The results indicate that the landscape types were dominated by arable land and construction land in 2017. Landscape indices at different scales were significantly different. The RWQ generally met Class II or III surface water quality standard. Arable land and construction land had a negative impact on RWQ, both of which were "source" landscapes, while forest was a "sink" landscape that can effectively alleviate the deterioration of RWQ. The eight landscape indices which indicated heterogeneity, fragmentation level, landscape diversity, and shape information had different degrees of correlation with NO3--N, NH4+-N, CODMn and BOD5. Different scales of landscape features had different correlations with RWQ, with the strongest correlation in the riparian zone, followed by the river reach, and the weakest in the sub-catchment. The influence of steep slope land was higher than that of flat ground land. The study confirmed that landscape structure and configuration had a scale effect on RWQ. It thus has great significance for water resources protection and land use management in the study area.
