Intra-and inter-annual variation patterns of NDVI in Tibet based on AVHRR remote sensing data

Abstract

Abstract: Based on the NOAA-AVHRR and related meteorological data from 1982 to 2000,this paper studied the temporal variation of three main vegetation types(spare grass,dense grass and Tibet forest) NDVI(normal difference vegetation index) in Tibet.The intra-annual variation of NDVI and its connection with meteorological data were discussed,based on the average monthly composite NDVI estimated from AVHRR data,and the inter-annual variation of NDVI was analyzed by using the standard deviation of multi-years monthly composite NDVI.The results showed that dense grass and Tibet forest had an obvious seasonable variation of NDVI in a year,and spare grass had not.For the inter-annual dynamics of monthly composite NDVI,dense grass had the largest variation,followed by Tibet forest and spare grass.The months with relatively large inter-annual variation were mainly from June to October,the local main growth seasons with higher NDVI values.

Key words: Stomatal infiltration, K⁺ efflux, ABA disposal, Protection effect

CLC Number:

HOU Yingyu, ZHANG Jiahua, HE Yanbo. Intra-and inter-annual variation patterns of NDVI in Tibet based on AVHRR remote sensing data[J]. cje, 2005, (11): 1273-1276.

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