丹江口库区陆地植被物候空间格局及其与海拔的响应关系

doi:10.11870/cjlyzyyhj201610018

Abstract

Abstract: Greater spatial variation occurred in vegetation phenology, which may be due to the spatial distribution of rainfall and temperature as a function of elevation. In this study, taking the Danjiangkou reservoir as study area, we assessed the spatial variation in key vegetation phenology parameters in relation to elevation. This work will has important practical significance on further vegetation phenological analysis, and thus is helpful for land cover change detection in the reservoir. We employed the Savitzky-Golay filter to rebuild the Moderate Resolution Imaging Spectroradiometer (MODIS) Enhanced Vegetation Index time-series dataset, and then a dynamic threshold method was used to investigate the spatial distribution of terrestrial vegetation phenology in Danjiangkou reservoir during 2001-2012. The results showed that the vegetation growing season spans from early April to early October, and the average length of growth season ranges from 100 days to 200 days. The spatial patterns of the vegetation phenology indicated that the relatively longer length of season (LOS) in the south resulted from an early start of season (SOS) and later end of season (EOS). Regression models and correlation analysis indicated that elevation is moderately related to vegetation phenology. However, the relation between vegetation phenology and elevation displayed different variation trends above or below 474 m. In the land area where elevation below 474 m, there was generally an advanced SOS, and delayed EOS of vegetation growing season, due to warmer temperatures at higher elevation. However, the elevation-phenology relationship was reversed where the elevation was above 474 m, which coincides with colder temperatures at higher elevations.

Key words: vegetation phenology, elevation gradient, Danjiangkou reservoir, MODIS vegetation index time-series data

CLC Number:

Q948.11

PENG Huan-hua, LI Chao-kui, TANG Zhi-guang, LIANG Ji. SPATIAL PATTERNS IN THE TERRESTRIAL VEGETATION PHENOLOGY OF DANJIANGKOU RESERVOIR AREA AND ITS RELATION WITH ELEVATION[J].RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2016, 25(10): 1626-1634.

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SPATIAL PATTERNS IN THE TERRESTRIAL VEGETATION PHENOLOGY OF DANJIANGKOU RESERVOIR AREA AND ITS RELATION WITH ELEVATION

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