Effect of Loess Plateau climate on the spatial heterogeneity of NDVI from 2001 to 2020
Based on the normalized difference vegetation index(NDVI)and climate data from 2001 to 2020,the effects of climate change on vegetation and vegetation change trends in the Loess Plateau were explored by geographically weighted method.The results showed that there was a non-stationary relationship between NDVI and land surface temperature in the Loess Plateau.The regression coefficient of NDVI and temperature index was mainly negative,and mainly concentrated in the northern Inner Mongolia Plateau,while the spatial positive correlation was concentrated in the south of Huhuanyong line.By comparing the standardized coefficients of different climate indicators,it could be seen that precipitation was the main factor controlling vegetation change in the Loess Plateau,accounting for 30.90%of the total area of the Loess Plateau.The areas where vegetation was significantly controlled by water were mainly concentrated in the Inner Mongolia Plateau in the northern and central part of the Loess Plateau and near the Qilian Mountains in the west.The main dominant factor of vegetation activity in the central and southern part of the Loess Plateau was the temperature,accounting for 42.91%of the total area of the Loess Plateau.Among them,the highest temperature had the widest influence on NDVI,including eastern Gansu Province,central Shaanxi Province,southern Shanxi Province and Henan Province.The vegetation in these areas was mainly agriculture vegetation and forestry vegetation,the precipitation was abundant,and with the increase of temperature,vegetation activity had increased.The regression results of NDVI variability and climate variability showed that the increase of tempera-ture in the Loess Plateau promoted the growth of vegetation in a wide area.However,in the northwest of the Loess Plateau,the temper-ature and precipitation decreased while the vegetation showed an increasing trend.
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