Variations and Impact Factors of NDVI in Dulan County of Qinghai Provinc

Chang Jin; Zhang Ke-bin; Bian Zhen; Cheng Zhong-qiu; Wang Li-li; Xiao Hong-xia

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Variations and Impact Factors of NDVI in Dulan County of Qinghai Provinc

- Variations and Impact Factors of NDVI in Dulan County of Qinghai Provinc
- Bulletin of Soiland Water Conservation Vol. 30, Issue 5, Pages: 204-207(2011)
- 作者机构：
  
  北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室
- 作者简介：
- 基金信息：
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- Published：2011
- 稿件说明：
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Chang Jin, Zhang Ke-bin, Bian Zhen, et al. Variations and Impact Factors of NDVI in Dulan County of Qinghai Provinc[J]. Bulletin of Soiland Water Conservation, 2011, 30(5): 204-207.
DOI：

Chang Jin, Zhang Ke-bin, Bian Zhen, et al. Variations and Impact Factors of NDVI in Dulan County of Qinghai Provinc[J]. Bulletin of Soiland Water Conservation, 2011, 30(5): 204-207. DOI：

摘要

研究植被覆盖的动态变化可以探知荒漠化的动态变化。利用青海省都兰县2000—2009年MO-DIS

NDVI数据对该区的植被动态变化进行了监测

并在此基础上对NDVI的变化与气温、降水的相关性进行了研究。结果表明

2000—2009年都兰县的NDVI总体上呈缓慢的上升趋势

上升率为0.0029/a

NDVI值年内变化具有很强的季节性

NDVI值总体水平不高

最大值仅为0.22;全县39.71%的面积植被明显改善

主要位于查查河、察汗乌苏河以及柴达木河下游的大片区域

17.74%面积出现植被退化

主要位于柴达木河中上游河岸周围的广大区域

荒漠化治理有待进一步加强。气温和降雨是影响该区植被状况的主导自然因子

5—9月的气温与NDVI极显著相关(p<0.01)

5—9月的降雨量与NDVI显著相关(p<0.05)

气温对NDVI的影响强于降水。

Abstract

The knowledge of vegetation cover changes will provide considerable insights into the dynamic process of desertification.The study illustrated the vegetation dynamic changes in Dulan County

Qinghai Province using 2000—2009MODIS NDVI data

and on this basis

the relationship between NDVI changes with temperature and rainfall variations were investigated

providing the basic data to land use planning in alpine areas and desertification prevention and control.The results indicate that the NDVI values of the area presented a slow ascendant trend from 2000to 2009

at the rate of 0.002 9/a.The NDVI values had a strong seasonal changes in a year

but the overall NDVIs were not high for the county

with the maximum value of 0.22.The vegetation condition were improved significantly in 39.71%of the area of the entire county

which mainly located in basins of Chacha river and Chahanwusu river and a large area of Qaidam river downstream.However

the vegetation degeneration was found in the upper and middle reaches of Qaidam river

accounting for 17.74%of the entire county

suggesting that the desertification control should be further strengthened.The temperature and rainfall were the two main natural factors influencing the NDVI dynamics of the county;the NDVIs correlated strongly significantly with the temperature(p< 0.01)

and significantly with the rainfall amount(p<0.05)from May to September annually.The impact of the temperature on the NDVI was stronger than that of the precipitation

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