Change Trend of Vegetation Coverage in the Mu Us Sandy Region from 2000 to 2015

doi:10.7522/j.issn.1000-694X.2018.00035

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (5): 1099-1107.DOI: 10.7522/j.issn.1000-694X.2018.00035

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Change Trend of Vegetation Coverage in the Mu Us Sandy Region from 2000 to 2015

Guo Zichen^1,2, Liu Shulin¹, Kang Wenping^1,2, Chen Xiang^1,2, Zhang Xueqin^1,2

1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-10-26 Revised:2018-04-10 Online:2018-09-20 Published:2018-11-03

Abstract

Abstract: The Mu Us Sandy Region (MUSR) suffering serious desertification was an important component of China's ecological security barriers. In recent years, the state and local governments have implemented a series of ecological protection and construction projects in this region. In this paper, regression analysis were used to analyze change trend of vegetation coverage and its response to temperature and precipitation in the MUSR, based on MODIS13Q1 NDVI time-series data from 2000 to 2015, annual mean temperature and annual total precipitation data. The results showed that:(1) the vegetation coverage tended to decrease from east to west in the MUSR, and it was less than 30% in most areas of the MUSR. The mobile sand dunes with very low vegetation coverage were still obviously present in the hinterland of the MUSR. (2) Since 2000, the vegetation coverage in the MUSR has been increasing generally, but there was obvious spatial difference. The areas with significant or extremely significant increase of vegetation coverage distributed in most regions of the middle-eastern MUSR and those places among shifting-dune belts. The change trend of vegetation coverage in the desert steppe area of.the western Ordos plateau was not significant. The areas with significant or extremely significant decrease of vegetation coverage were very few, scattered in the MUSR. (3) There were spatial and time-delay differences about responses of the vegetation coverage to annual total precipitation and annual mean temperature in the MUSR. The vegetation coverage responses to annual total precipitation and annual mean temperature in the transitional zone of Loess plateau and the desert steppe region in the western Ordos Plateau were very sensitive, because of bigger correlation coefficients between them. Although weak correlation between vegetation coverage change and annual total precipitation or annual mean temperature in the Mu Us Sandy Land, there was significant increase correlation coefficients between vegetation coverage change and time-delay annual total precipitation. This might was related to water redistribution and use means due to different soil textures and vegetation types in the Mu Us Sandy Land.

Key words: Mu Us Sandy Region, vegetation coverage, trend analysis

CLC Number:

Q948.15

Guo Zichen, Liu Shulin, Kang Wenping, Chen Xiang, Zhang Xueqin. Change Trend of Vegetation Coverage in the Mu Us Sandy Region from 2000 to 2015[J]. Journal of Desert Research, 2018, 38(5): 1099-1107.

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Change Trend of Vegetation Coverage in the Mu Us Sandy Region from 2000 to 2015

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