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Spatio-temporal Distribution of Drought in the Belt and Road Area During 1998–2015 Based on TRMM precipitation Data

Journal of Resources and Ecology 2017年第6期8卷 559-570页

作者： BAI Yongqing WANG Juanle WANG Yujie HAN Xuehua Bair Z. Tsydypov Altansukh Ochir Davaadorj Davaasuren State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China University of Chincse Academy of Sciences Beijing 100049 China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023 China Shandong University of Technology Zibo Shandong 255012 China Baikal Institute of Nature Management Siberian Branch Russian Academy of Sciences U lan-Ude 670047 Russia School of Engineering and Applied Sciences National University of Mongolia Ulaanbaatar city 210646 Mongolia Department of the Geography School of the Art ＆ Sciences National University of Mongolia Ulaanbaatar city 210646 Mongolia

Drought is a worldwide natural disaster that has long affected agricultural production as well as social and economic activities. Frequent droughts have been observed in the Belt and Road area, in which much of the agricultural land is concentrated in fragile ecological environment. Based on the Tropical Rainfall Measuring Mission Satellite（TRMM） 3 B43 precipitation data, we used the precipitation abnormity percentage drought model to study the monthly spatio-temporal distribution of drought in south region of N50° of the Belt and Road area. It was observed that drought during winter was mainly distributed in Northeast Asia, Southeast Asia, and South Asia, while it was mainly distributed in Central Asia and West Asia during summer. The occurrence of historical droughts indicates an obvious seasonal cycle. The regional variations in drought were analyzed using the Breaks for Additive Season and Trend tool（BFAST） in six sub-regions according to the spatial distribution of six economic corridors in the Belt and Road area. The average drought conditions over the 18 years show a slight decreasing trend in Northeast Asia, West Asia, North Africa, South Asia, Central and Eastern Europe, and a slight increasing trend in Central Asia. However, it was a fluctuating pattern of first increasing and then decreasing in Southeast Asia. The results indicate that the total drought area in the Belt and Road region showed a general decreasing trend at a rate of 40,260 km^2 per year from 1998 to 2015.

关键词： drought distribution the Belt and Road TRMM precipitation abnormity percentage BFAST

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Research on the Summer Drought in Chongqing Using MODIS-EVI Time Series Data

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Agricultural Science & Technology 2010年第7期11卷 124-127,167页

作者：易佳高阳华杨世琦田永中重庆市气象科学研究所重庆401147 西南大学地理科学学院重庆400715

MODIS-EVI time series data from 2000 to 2009 in Chongqing were selected for this *** the use of best index slope extraction （BISE） method for cloud elimination,analysis on the change vector of EVI time series data were conducted to investigate the EVI response on drought; then,four typical regions were selected to study the relationship between precipitation,temperature and EVI when the sever drought occurred in 2006; finally,based on the time series of vegetation condition index （VCI） and precipitation abnormity percentage,the temporal and spatial distributions of drought were *** results showed that,the EVI value of the summer in 2006 was significantly lower than the average EVI at the corresponding period of the other years in *** addition,summer drought occurred mainly during the hot and dry *** the southeast area,most of the other regions in Chongqing were all under severe drought.

关键词： Time series of vegetation condition index precipitation abnormity percentage Best index slope extraction Chongqing

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