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[1]PANG Jiatai,DUAN Jinliang,ZHANG Rui,et al.Characteristics of Spatiotemporal Evolution and Climate Response of Vegetation Cover in the Wei River Basin from 2000 to 2019[J].Research of Soil and Water Conservation,2021,28(05):230-237.

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Characteristics of Spatiotemporal Evolution and Climate Response of Vegetation Cover in the Wei River Basin from 2000 to 2019

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 05 Page number: 230-237 Column: Public date: 2021-08-20

Title:: Characteristics of Spatiotemporal Evolution and Climate Response of Vegetation Cover in the Wei River Basin from 2000 to 2019

Author(s):: PANG Jiatai¹,DUAN Jinliang¹,ZHANG Rui^1,2,LYU Jichao¹; (1.Department of Surveying,Mapping and Remote Sensing Information,School of Earth Science and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China; 2.Southwest Jiaotong University,National and Local Joint Engineering Laboratory for High-speed Railway Operation Safety Space Information Technology,Chengdu 611756,China)

Keywords:: MODIS-NDVI; Weihe River Basin; vegetation coverage; trend analysis; Hurst index; M-K test

CLC:: Q948

DOI:: -

Abstract:: The Weihe River is one of the largest tributaries and main sources of sediment transport in the Yellow River,which covers the Loess Plateau and Qinling region,spans different climatic zones and has a relatively fragile ecological environment. Therefore,it is of great significance to analyze vegetation cover and climate response in this basin. Based on MODIS-NDVI data,we calculated vegetation cover by combining the binary model,and used trend analysis and Hurst index to analyze the spatial evolution characteristics and trends of vegetation cover in the Weihe River Basin from 2000 to 2019. The influence of climate factors on vegetation cover was analyzed by using partial correlation analysis and Mann-Kendall test and combining with the meteorological data of the Weihe River Basin. The results show that:(1)the vegetation cover of the Weihe River Basin showed the low level in the northern Shaanxi region and the northwest Ningxia and Gansu area,the relatively high level in the Qinling area and the Jinghe River and Luohe River areas in the southern part of the Weihe River basin,and presented the decreasing trend from southeast towards the northwest in the whole basin;(2)the vegetation cover of the Weihe River basin had risen overall from 2000 to 2019 with the increase rate of 0.095/decade,the vegetation cover significantly decreased in the regions with the more dense urban areas in the middle and lower reaches of the main stream of the Weihe River;(3)the trend of future changes in vegetation cover in the Weihe River basin showed the further improvement trend in the basin as a whole(area ratio 93.36%),the future trend of vegetation cover in regions with the dense urban areasalong the middle and lower reaches of the Weihe River showed a trend of continuous degradation(area ratio 6.64%);(4)in the past 40 years,the temperature of the Weihe River Basin had shown a significant upward trend with the increase rate of 0.42 ℃/decade,and the precipitation showed a slow increase trend; the correlation between temperature and vegetation cover had obvious regional characteristics,and the correlation of vegetation cover was not significant. The results of the study can provide reference significance for ecological construction and soil and water conservation in the Weihe River Basin.

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Last Update: 2021-08-20