摘要：
The changes of lakes directly affect the sustainable development of regional ecological environment and social economy. Affected by the environmental changes and human activities, most of the inland lakes globally have suffered from the area shrinkage and wetland degradation. The protection and restoration of lakes have become a hot public issue. In this study, a lake spatial database of Hubei Province (China) is built to analyze the temporal-spatial dynamic change of lakes in Hubei Province from 1974 to 2014, with the analysis models of lake dynamic change rate (LDCR), lake landscape shape index (LLSI), and lake centroid shift rate (LCSR). The results are as follows: (1) Lakes in Hubei Province showed a shrinking and fragmenting trend from 1975 to 2014. The total area of lakes decreased by 23.08%, and the number of lake increased by 68.03%. (2) The value of LLSI firstly increased and then decreased after 1995, meaning that the lake disturbance degree of human activities decreased firstly and then increased. (3) The lake centroids of Hubei Province were in the Jianghan Plain and shifted to the northwest by 33.67 km from 1975 to 2014, due to the lake shrinkage was more serious in the southeastern than in the northwest. The situation of inland lakes' shrinkage and degeneration is still very severe. The national and local governments should strengthen the lake management and protection, curb the lake shrinkage and degradation, and promote the healthy and sustainable development of lakes.
作者机构：
[Yu Guangming; Tu Zhenfa; Tan Wenxia; Xu Lili] Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Hubei, Peoples R China.;[Yu Guangming; Tu Zhenfa; Tan Wenxia; Xu Lili] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Hubei, Peoples R China.;[Zhang Wenjie] Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China.;[Zhang Wenjie] Univ Technol Sydney, Plant Funct Biol & Climate Change Cluster C3, Sydney, NSW 2007, Australia.
通讯机构：
[Xu Lili] C;Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
关键词：
temperature;precipitation;trend feature;trend-shift feature;arid/semi-arid area
摘要：
Detecting change features of climate variables in arid/semi-arid areas is essential for understanding related climate change patterns and the driving and evolution mechanism between climate and arid/semi-arid ecosystems. This paper takes Inner Mongolia of China, a unique arid/semi-arid ecosystem, as the study area. We first detected trend features of climate variables using the linear trend analysis method and then detected their trend-shift features using the breaks for additive seasonal and trend method based on the time-series of monthly precipitation and monthly mean temperature datasets from 1962 to 2016. We analyzed the different change features of precipitation and temperature on a regional scale and in different ecological zones to discover the spatial heterogeneity of change features. The results showed that Inner Mongolia has become warmer-wetter during the past 54 years. The regional annual mean temperature increased 0.4°C per decade with a change rate of 56.2%. The regional annual precipitation increased 0.07 mm per decade with a slightly change rate of about 1.7%, but the trend was not statistically significant. The warmer trend was contributed by the same positive trend in each season, while the wetter trend was contributed by the negative trend of the summer precipitation and the positive trend of the other three seasons. The regional monthly precipitation series had a trend-shift pattern with a structural breakpoint in the year 1999, while the regional monthly mean temperature series showed an increasing trend without a periodical trend-shift. After the year 2000, the warmer-wetter trend of the climate in Inner Mongolia was accelerated. The late 20th century was a key period, because the acceleration of the wetter trend in some local zones (I and II) and the alleviation of the warmer trend in some local zones (VII, VIII and IX) occurred simultaneously. Moreover, the change features had a strong spatial heterogeneity, the southeastern and southwestern of Inner Mongolia went through a warmer-drier trend compared with the other areas. The spatio-temporal heterogeneity of the climate change features is a necessary background for various types of research, such as regional climate change, the evolution of arid/semi-arid ecosystems, and the interaction mechanisms between climate and arid/semi-arid ecosystems based on earth-system models in Inner Mongolia.
通讯机构：
[Tu, ZF; Yu, GM] C;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
关键词：
Crop water requirement;CropWRA model;SDCWR model;SHRD model;Water resources assessment;Water-satisfied degree
摘要：
An assessment model for the satisfied degree of crop water requirements (CWR) on the grid scale, the CropWRA model, is developed to support precise management of agricultural water resources. On the grid scale, we urge that the CWR satisfied degree is not only rested with the abundance of water resources in a region, but also related to crop types, growing periods, water accessibility, etc. The CropWRA model also consists of corresponding indexes such as the CWR characteristics, crop planting combination and proportion, available water of agricultural production, water accessibility, etc. In this case study, the CWR satisfied degree of main food crops is evaluated with DEM data, hydrological data, meteorological and climate data, crop experiment and observation data, and statistical data in Hanjiang River Basin, China. In general, the results show that agricultural water resources can satisfy the CWR but the spatial differences are profoundly remarkable. The CropWRA index varies from -20% to 200%, and this difference is the comprehensive effects caused by the topography, river system, crop planting combination, land use, and water resources composition, etc. CropWRA model reveals the spatial differences in the relationships of CWR supply and demand and can provide the data support for precise water resource allocation.
摘要：
Discriminating the significant human-induced vegetation changes over the past 15 years could help local governments review the effects of eco-programs and develop sustainable land use policies in arid/semi-arid ecosystems. We used the residual trends method (RESTREND) to estimate the human-induced and climate-induced vegetation changes. Two typical regions in the Horqin Sandy Land of China were selected as study areas. We first detected vegetation dynamics between 2000–2014 using Sen’s slope estimation and the Mann–Kendall test detection method (SMK) based on the Moderate Resolution Imaging Spectroradiometer (MODIS) normalized difference vegetation index (NDVI) time series, then used RESTREND to profile human modifications in areas of significant vegetation change. RESTREND was optimized using statistical and trajectory analysis to automatically identify flexible spatially homogeneous neighborhoods, which were essential for determining the reference areas. The results indicated the following. (1) Obvious vegetation increases happened in both regions, but Naiman (64.1%) increased more than Ar Horqin (16.8%). (2) Climate and human drivers both contributed to significant changes. The two factors contributed equally to vegetation change in Ar Horqin, while human drivers contributed more in Naiman. (3) Human factors had a stronger influence on ecosystems, and were more responsible for vegetation decreases in both regions. Further evidences showed that the primary human drivers varied in regions. Grassland eco-management was the key driver in Ar Horqin, while farming was the key factor for vegetation change in Naiman.
通讯机构：
[Yu, GM; Tu, ZF] H;[Yu, GM; Tu, ZF] C;Hubei Prov Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei Province, Peoples R China.;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.
关键词：
Water accessibility;Natural river network;SHRD model;Watershed scale;Water resources management
摘要：
Traditional assessments of water resources use water availability as an evaluating metric. Water availability is a statistical average and cannot reflect the spatial differences of water resources in a region or basin. This assessment usually engenders a paradox, that is, water resources are abundant in a region but it is difficult to obtain water for the people on some spatial points in this region. In this study we define a new term, water accessibility, to eliminate this paradox and develop a model of water accessibility (the SHRD model) to meet the need of spatial details in water resources assessment at the grid scale. In the case study the water accessibility of the Hanjiang River Basin is mapped and assessed by the SHRD model. The comprehensive index of water accessibility is 0 to 4.5 and tends to increase from northwest to southeast in the study area. The results of the SHRD model can show the spatial pattern of water accessibility in a region, and can server a more finely-tuned water resources management approach. This model and method push the macroscopic (regional) water resources assessment forward from the microcosmic (raster cell) analysis.
通讯机构：
[Yu, Guangming] C;[Fan, Yong] W;Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.
关键词：
Evolution mechanism;Origin;Resistance model;Spatial pattern;Urban system;Urban tree theory
摘要：
The origin, spatial pattern, and evolution of urban system have been hot research issues in the field of urban system. In this study, the theory of "urban tree (UT)" was proposed to address these issues. The spatial pattern of urban system can be expressed by the phrase UT and the growth of the UT reflects the origin, spatial pattern, and evolution of urban system. Analysis of the UT growth can reveal the evolutionary mechanisms of the urban system. We present an UT resistance model to determine spatial extension in the evolutionary processes of urban system. The Thiessen polygon method and spatial re mapping were used to construct the UT. Data collected in 1995, 2000, 2005 and 2010 from cities in the Huai River Basin were used to construct the UT model to analyze the origin, spatial pattern, and evolution of urban system in this region. Xuzhou City was the UT "tree root" and the UT growth the followed four paths. Growth of cities on the nodes of these paths promoted the evolution of urban system. The UT theory expresses the spatial pattern and evolution of urban system in an intuitive way and helps to explain the origin and evolution mechanisms of urban system. Empirical research supported the UT theory. Because of the operational and visual expression, this theory has broad application prospects in the urban system research. (C) 2016 Elsevier Ltd. All rights reserved.
作者机构：
[Yu, Guang-ming; Yu, Qi-wu; He, Xiao-li; Wu, Lei] Cent China Normal Univ, Coll Urban & Environm Sci, Lab Global Change & Disasters, Wuhan 430079, Peoples R China.
会议名称：
2014 International conference on energy, environment and materials engineering (EEME 2014)
关键词：
Rainfall variation;Trend analysis;Correlation analysis;Global climate change;Wuhan city
摘要：
The daily average rainfall and the data of NOAA precipitation reconstruction (PREC) are adopted to analyze the characteristics of rainfall variation and its response to global climate change by trend analysis and correlation analysis in Wuhan City from 1951 to 2011 in this study. The results of this study show as: (1) The change of decadal average rainfall is undulant, but the overall trend is ascending in recent 60 years; (2) trend of rainfall increase or decrease is significant in different seasons; (3) there are three cycles with the scales of 15 to 32 years, 4 to 17 years, and 1 to 3 years respectively; and (4) the change of rainfall is more apparent than global, and mutation probability of rainfall increases slightly in recent decades.
摘要：
The purpose of this study is to develop an assessment framework of ecological security at the watershed scale to meet the need of watershed management, and to assess ecological security using this framework in the middle and lower reaches of Hanjiang River Basin (in Hubei Province, China). The states and their changes of ecological security in the study region are investigated with the support of ERDAS and ARC/INFO platform. The results show that the ecological security index (P) values in 1995 and 2000 were 0.685 and 0.699 respectively in the study region. While in 2005 and 2010, the P values were decreased to 0.657 and 0.624. In 1995, there were 5 counties with degree II state (the poor state) of ecological security, and 14 counties with degree III state (the common state). By 2000, the amount of counties with degree II decreased to 4 counties. And the number of counties with degree II is the same as 2000 in 2005. The result of 2010 shows there were 12 countries with degree III state as well as 7 counties with degree II state. The results of our case study of the Hanjiang River Basin reflect that the ES situation is very grim in the study area. The degree of ecological security developed in this study can be used as a useful tool for watershed managers and decision-makers.
摘要：
A metropolitan area is a region with one or more central cities and a tendency gathering the neighboring connected cities as an entirety. The metropolitan area of Ruijin city consists of four cities, that is, Ruijin, Ningdu, Huichang and Shicheng cities. The fundamental conditions and constraints in the development of metropolitan area in Ruijin city are analyzed, the developmental model and spatial pattern are discussed, and the developmental strategies are suggested in the paper.
作者机构：
[Guangming Yu; Huanghuang Jia] Laboratory of Global Change and Disasters, College of Urban and Environment Science, Central China Normal University, Wuhan, 430079, China
作者机构：
[Yu, Guang-ming; He, Xiao-li; Wu, Lei] Cent China Normal Univ, Coll Urban & Environm Sci, Lab Global Change & Disasters, Wuhan 430079, Peoples R China.;[Fan, Yong] Xinyang Normal Univ, Coll Urban & Environm Sci, Xinyang 464000, Peoples R China.
会议名称：
International Conference on Energy, Environment and Materials Engineering (EEME)
会议时间：
FEB 22-23, 2014
会议地点：
Shenzhen, PEOPLES R CHINA
会议主办单位：
[Wu, Lei;He, Xiao-li;Yu, Guang-ming] Cent China Normal Univ, Coll Urban & Environm Sci, Lab Global Change & Disasters, Wuhan 430079, Peoples R China.^[Fan, Yong] Xinyang Normal Univ, Coll Urban & Environm Sci, Xinyang 464000, Peoples R China.
关键词：
Extreme precipitation events;Change trend;Mutation feature;Periodicity;Wuhan City
摘要：
Based on the daily precipitation data during 1951-2012, this paper analyzes the variation of extreme precipitation events in Wuhan City since 1951, with the methods of testing mutation such as CRAMER test, Sliding T-test, YAMAMOTO test, Mann-Kendall Non-parametric test and Morlet Wavelet Analysis. The results show that the overall change trend of extreme precipitation events is not significant in Wuhan City. There is a significant correlation between extreme precipitation index and annual precipitation. Annual precipitation is mainly affected by extreme precipitation and strong rainy days. The change of maximum five-day precipitation has a significant mutation in 1965. There are not significant mutations in the maximum daily precipitation, extreme precipitation, the days of heavy rainfall; the index of average annual extreme precipitation has a significant mutation in 1979; and change cycles are similar in all the extreme precipitation indices, with the long of about 28 or 20 years, the middle of about 11 years and the short of about 5 years.
作者机构：
[Guangming Yu; Xigui Li] College of Urban and Environmental Sciences, Central China Normal University
会议名称：
2014 3rd International Conference on Physical Education and Society Management(ICPESM 2014)
会议时间：
2014-01-01
会议地点：
Sanya,China
摘要：
Urbanization is the necessary stage in a regional construction of modernization, and the corollary of the development of human society and economyThere are two inevitable problems in the process of ur
作者机构：
[Yu, Guang-ming; Yu, Hai-long; Hu, Xiao-yan] Cent China Normal Univ, Coll Urban & Environm Sci, Lab Global Change & Disasters, Wuhan, Peoples R China.
会议名称：
2014 International Conference on Water Resource and Environmental Protection (WREP 2014)
关键词：
Rural;Outskirt;Environment Pollution;Countermeasures;Shangqiu City
摘要：
With the rapid development of the urbanization in recent years, some peculiar environmental pollution is taken place in the outskirts of the large and medium-size cities. It does not only hinder the progress of urbanization and the New Village's construction but also restrict the improvement in the living standard of the suburban. In a case study of rural environment in Shangqiu suburb, the causes, condition and features of the environment pollution are analyzed based on the field investigation and statistical data analysis, and then some countermeasures from the social, economic and cultural are put forward. The result of this study can provide a reference for environment protection and melioration.
