Analysis of the spatial-temporal change of the vegetation index in the upper reach of Han River Basin in 2000–2016
2018
Abstract. Han River is the water source region of the middle route of South-to-North
Water Diversion in China and the ecological projects were implemented since
many years ago. In order to monitor the change of vegetation in Han River and
evaluate the effect of ecological projects, it is needed to reveal the
spatial-temporal change of the vegetation in the upper reach of Han River
quantitatively. The study is based on MODIS/Terra NDVI remote sensing data,
and analyzes the spatial-temporal changes of the NDVI in August from 2000 to
2016 at pixel scale in the upper reach of Han River Basin. The results show
that, the area with increasing NDVI between 0 and 0.005 per year accounts for
62.07 % of the area of upper reach of Han River Basin, and the area with
changing rate between − 0.005 and 0 per year accounts for 26.65 % of the
research area. The area with significant decreasing trend only accounts for
2.76 %, while area significant increasing trend accounts for 13.47 %,
and the area with increasing NDVI is much larger than the area with reducing
NDVI. The vegetation index of each county is evaluated and found that, the
areal proportion with significant decreasing trend in Hantai is the biggest,
reaching 35.57 %. The areal proportion with significant increasing trend
in Zhenba County, Ziyang County, Xunyang County, Zhashui County, Shangzhou
District, Shanyang County and Yun County is larger than the others, and the
areal proportions are more than 20 %. The largest areal proportion with
significant increasing trend is in Shangzhou District and it reaches
31.11 %. On the whole, the area ratio in all districts and counties with
increasing NDVI is much larger than the area ratio with decreasing NDVI.
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