Dynamic Changes of Fractional Vegetation Cover along the Mainstream of the Tarim River

doi:10.7522/j.issn.1000-694X.2015.00147

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (5): 1472-1480.DOI: 10.7522/j.issn.1000-694X.2015.00147

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Dynamic Changes of Fractional Vegetation Cover along the Mainstream of the Tarim River

Guo Hui^1,3, Huang Yue¹, Li Xiangyi², Bao Anming¹, Song Yang^1,3, Meng Fanhao^1,3

1. State Key Laboratory of Desert and Oasis Ecology, Urumqi 830011, China;
2. Cele National Station of Observation & Research for Desert Grassland Ecosystem, Xinjiang Institute of Ecology and Geography, Chinese academy of Sciences, Urumqi 830011, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2015-06-17 Revised:2015-10-12 Online:2016-09-20 Published:2016-09-20

Abstract

Abstract: This paper, by using ground observation data with Landsat TM data and MODIS data, based on upscaling method,employing the modified three-band maximal gradient difference model which reverses vegetation fractional cover, analyzed the spatial-tempo change characters as well as dynamic changes of vegetation fractional cover on the mainstream of the Tarim River during 2000-2013. The result indicated that:(1) The method of upscaling combined with ground observation data, Landsat TM and MODIS data could realize the analysis of vegetation changes of a wide range during long time series, scale conversion error controlled within 4%; (2) The maximum value of vegetation fractional cover appeared in July and August within a year on the mainstream of the river, the annual average vegetation fractional cover changes overall showed a positive trends where the range of vegetation fractional cover between 18.67%-23.67% on the upper reaches, 10.6%-12.44% on the middle reaches, 4.7%-6% on the lower reaches. There was a remarkable increase during 2000-2006 and a small fluctuation during 2006-2013; (3) The fractional vegetation cover on the mainstream had a significant spatial variation. The upper reaches had a highest growth rate, followed by the middle reaches, the lower reaches had a minimum growth rate. The growth rate of upper reaches was 0.37%, the growth rate of the middle reaches was 0.06%, but there is no significant change trend in it, the growth rate of lower reaches wass 0.05%.

Key words: modified three-band maximal gradient difference model, upscaling, vegetation fractional cover, spatial-tempo change characters, Tarim River

CLC Number:

P901

Guo Hui, Huang Yue, Li Xiangyi, Bao Anming, Song Yang, Meng Fanhao. Dynamic Changes of Fractional Vegetation Cover along the Mainstream of the Tarim River[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(5): 1472-1480.

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Dynamic Changes of Fractional Vegetation Cover along the Mainstream of the Tarim River

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