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[1]ZHANG Fangning,YANG Liangjie,YANG Yongchun.Change of Vegetation NDVI and Its Response to Climatic and Human Activities in the Loess Plateau During 1981—2016[J].Research of Soil and Water Conservation,2023,30(02):230-237.[doi:10.13869/j.cnki.rswc.2023.02.044]

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Change of Vegetation NDVI and Its Response to Climatic and Human Activities in the Loess Plateau During 1981—2016

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 230-237 Column: Public date: 2023-03-10

Title:: Change of Vegetation NDVI and Its Response to Climatic and Human Activities in the Loess Plateau During 1981—2016

Author(s):: ZHANG Fangning¹, YANG Liangjie¹, YANG Yongchun^2,3; (1.College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China; 2.College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; 3.Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou 730000, China)

Keywords:: vegetation change; Loess Plateau; climatic change; human activities; response

CLC:: Q948

DOI:: 10.13869/j.cnki.rswc.2023.02.044

Abstract:: Exploring the evolution of vegetation cover and its drivers on the Loess Plateau can help to understand the ecological status, dissect vegetation changes and drivers. In order to provide a scientific basis for ecological environmental management and planning, based on the data of NDVI, temperature and precipitation in the Loess Plateau, the changing of vegetation NDVI and its response to climate and human activities in the Loess Plateau during 1981—2016 were distinguished by using the methods of trend analysis and multiple regression residuals analysis. The results showed that:(1)during 1981—2016, the overall vegetation cover in the Loess Plateau was low, but the increase was high and ecological restoration was remarkable; the spatial pattern of vegetation NDVI was high in the southeast and low in the northwest in the Loess Plateau during 1981—2016, with a high overall increase and remarkable ecological restoration effect; Lanzhou-Xining urban agglomeration and some regions of Inner Mongolia were the areas with a decrease on NDVI in the selected 45 prefectures and cities, while the vegetation NDVI in Yulin, Tongchuan, Yan'an and Weinan increased much faster compared with other regions;(2)the climatic change and human activities drove the NDVI change jointly as main forces in the Loess Plateau in recent 35 years and induced both a rapid increasing trend on the whole and a huge spatial difference; the impact of climate change on NDVI in the Loess Plateau was mainly slightly promoted and moderately promoted, while the impacts of rural human activities and urban human activities was main inhibition and slight inhibition;(3)the contributions of climatic change, human activities in rural and urban areas to the increase of NDVI in the Loess Plateau accounted for 82.03%, 11.68% and 6.29%, respectively; the regions where the contribution rates of climatic change were more than 60% mainly distributed in the eastern and central parts of the Loess Plateau; the impact of human activities on NDVI was mainly caused by production and living activities, there were 0.29% regions where the contribution rates of rural human activities were more than 50% mainly distributed in the south of the Loess Plateau, the contribution rate of urban human activities was less than 60%; There were 22 prefectures and cities where the contributions of climatic change were more than 50%, and the contributions induced by climatic change in Zhengzhou, Baoji, and Hohhot were much greater than those of any other regions. In summary, the vegetation coverage on the Loess Plateau showed a characteristic of high level in the southeast and low level in the northwest, with significant ecological and environmental restoration effects. Climate change had been having a facilitative effect on the recovery of vegetation, while the inhibiting effect of human activities was evident. This study suggested that more attention should be paid to the role of humans in vegetation restoration, and provided a reference for ecological environment management.

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Last Update: 2023-03-10