中国北方典型荒漠区生长季降水特征和归一化植被指数的关系

doi:10.13866/j.azr.2019.05.21

Abstract

Abstract: Precipitation change in vegetation growing season is an important factor causing inter-annual fluctuation of vegetation growth.The correlation between NDVI_max and precipitation in vegetation growing season in a typical desert in north China was analyzed using the MODIS normalized vegetation dataset and the daily precipitation data from May to September during the period of 2000-2017.The results indicated that the values of NDVI_max in four sample plots in the study area were in an increase trend from 2000 to 2017.Precipitation in the study area in vegetation growing season was in an increase-decrease-increase trend.The precipitation concentration degree (PCD) was high in the west but low in the east,and it became later in the study area.In addition to Yulin,the effects of PCD and PCP on NDVI_max in other three sample plots were higher than that of precipitation,which revealed that the inter-annual fluctuation of NDVI_max values in these sample plots was mainly affected by the changes of PCD and PCP,and there were the positive correlations among them.In Yulin,however,the NDVI_max had a positive correlation with the precipitation in vegetation growing season,but a negative one with PCD,and its correlation with the precipitation in vegetation growing season was the highest,indicating that the vegetation growth to precipitation in vegetation growing season was more sensitive.

Key words: NDVI, vegetation growing season, precipitation variation, precipitation concentration degree, precipitation concentration period, desert

LI Ya-feng, TANG Li-song. Correlation between Precipitation and NDVI in Vegetation Growing Season in a Typical Desert in North China[J].Arid Zone Research, 2019, 36(5): 1229-1237.

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Correlation between Precipitation and NDVI in Vegetation Growing Season in a Typical Desert in North China

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