中国农业气象

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1981-2006年藏西北地区草地植被盖度动态变化分析

高清竹;段敏杰;李玉娥;万运帆;郭亚奇;刘硕;马欣;边多;   

  1. 中国农业科学院农业环境与可持续发展研究所/农业部农业环境与气候变化重点实验室;西藏高原大气环境科学研究所;
  • 出版日期:2010-08-10 发布日期:2010-08-10
  • 基金资助:
    中国气象局新技术推广项目(CMATG2009MS11);; 国家自然科学基金资助项目(30800142;40775062);; 西藏那曲地区与中国农业科学院合作项目

Change Trends of Grassland Coverage and Pasture Growth in the Northwest Area of Tibet

GAO Qing-zhu1,DUAN Min-jie1,LI Yu-e1,WAN Yun-fan1,GUO Ya-qi1,LIU Shuo1,MA Xin1,BIAN Duo2(1.Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences/Key Laboratoryfor Agro-Environment & Climate Change,Ministry of Agriculture,Beijing 100081,China;2.Tibetan Plateau AtmosphericEnvironmental Science Research Institute,Lhasa 850001)   

  • Online:2010-08-10 Published:2010-08-10

摘要: 基于长期遥感数据和地面实测数据,以植被盖度为例,监测了藏西北地区牧草长势及其变化趋势。结果表明:藏西北地区草地植被盖度不高,多年平均值仅为27.2%。1981-2006年,藏西北地区大部分区域(约占草地总面积的60.7%)高寒草地植被盖度年际变化属于正常波动范围;显著降低区域约占总面积的3.6%,主要分布于植被盖度相对较高的东南部地区;植被盖度显著增高区域约占35.7%,主要分布于植被盖度相对较低的中部和北部地区。在整体上,藏西北地区草地植被平均盖度略有增高趋势。

关键词: 藏西北地区, 高寒草地, 植被盖度, 动态变化, 遥感监测

Abstract: Based on the Normalized Difference Vegetation Index(NDVI) data(from 1981 to 2006),this paper revealed the dynamics of alpine grassland vegetation coverage and pasture growth in the northwest area of Tibet(NWT) by the method of remote sensing technique.The preliminary results were as follows: the alpine grassland vegetation coverage of NWT was very low that the average value was only 27.2% for many years.In terms of spatial distribution of grassland vegetation coverage,the eastern region had a relatively higher coverage of grassland vegetation;the western had the lowest vegetation coverage.During the period of 1981-2006,the average grassland vegetation coverage had a slight increasing trend,and most of the grassland area(60.7%) in NWT did not show a significant vegetation coverage change.The area with a significant decrease of vegetation coverage variation accounted for only 3.6% of the total grasslands surface,whereas that with a significant increase accounted for 35.7%.The grassland vegetation coverage in the western region had a marked rising trend while the coverage in the eastern regions had a decreasing tendency.

Key words: The northwest area of Tibet(NWT), The northwest area of Tibet(NWT), Alpine grassland, Vegetation coverage, Change trend, Remote sensing monitoring