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[1]JIA Yunfei,LI Yunfei,FAN Tiancheng,et al.Analysis of Vegetation Cover Change in Yanhe Basin and Its Gully Area on the Chinese Loess Plateau Based on Long Time Series NDVI[J].Research of Soil and Water Conservation,2022,29(04):240-247.

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Analysis of Vegetation Cover Change in Yanhe Basin and Its Gully Area on the Chinese Loess Plateau Based on Long Time Series NDVI

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 04 Page number: 240-247 Column: Public date: 2022-06-20

Title:: Analysis of Vegetation Cover Change in Yanhe Basin and Its Gully Area on the Chinese Loess Plateau Based on Long Time Series NDVI

Author(s):: JIA Yunfei, LI Yunfei, FAN Tiancheng, ZENG Jing, ZHAO Jianlin; (School of Geological Engineering and Surveying and Mapping, Chang'an University, Xi'an 710054, China)

Keywords:: vegetation cover change; gully areas; Yanhe Basin; Grain for Green Programs; NDVI

CLC:: X87; Q948.15

DOI:: -

Abstract:: The objective of this study is to explore the tendency of vegetation restoration in the sloping and gullying landform areas of the Yanhe Basin after the implementation of ecological projects such as ‘Grain for Green' Program. Based on the long-term NDVI and rainfall data, the change and overall trend of vegetation cover in the Yanhe Basin as well as its gully and hilly areas from 2000 to 2019 were analyzed and tested by applying statistical methods including trend analysis method, Pettitt mutation point analysis as well as residual analysis. The results show that:(1)the significant and positive trend of vegetation restoration in the Yanhe River Basin had been observed for the period of 2000 to 2019(Annual trend rate was 1.30%); however, a segmented feature existed in the general trend: the vegetation coverage was rapidly restored in 2000—2008(Annual trend rate was 2.00%)following with a relatively slight increase in 2009—2019(Annual trend rate was 0.70%), and some areas were degraded;(2)there was relatively strong correlation between gully area's NDVI and hilly slope area's NDVI(R²=0.967); meanwhile, the NDVI of the gully area simultaneously increased with the increase of the NDVI of the hilly area from 2000 to 2019;(3)correlation analysis suggested that precipitation did not significantly contribute to the change of vegetation cover in the Yanhe River Basin from 2000 to 2019, while, residual analysis indicated that human activities(‘Grain for Green' Program)significantly contributed to the vegetation cover change in Yanhe River Basin, with an annual rate of 1.29% for NDVI. These results show that ecological projects such as ‘Grain for Green' Program played the important role in vegetation restoration and the vegetation coverage of gully region simultaneously changed with the change of slope vegetation coverage.

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Last Update: 2022-06-20