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生态学杂志 ›› 2009, Vol. 28 ›› Issue (09): 1712-1718.

• 三北防护林生态工程研究专栏 • 上一篇    下一篇

基于MODIS数据的三北防护林工程区植被覆盖度提取与分析

吴云1,2;曾源1**;吴炳方1;李晓松1;武文波2   

  1. 1中国科学院遥感应用研究所|北京 100101;2辽宁工程技术大学测绘与地理科学学院|辽宁阜新 123000
  • 出版日期:2009-09-10 发布日期:2009-09-10

Retrieval and analysis of vegetation |cover in the Three-North Regions of China based on MODIS data.

WU Yun1,2;ZENG Yuan1;WU Bing-fang1|LI Xiao-song1;WU Wen-bo2   

  1. 1Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China|2Shool of Geomatics, Liaoning Technical University, Fuxin 123000, Liaoning, China
  • Online:2009-09-10 Published:2009-09-10

摘要: 以像元二分模型为基础,构建了基于归一化植被指数(NDVI)的植被覆盖度定量估算模型,并利用MODISNDVI时间序列数据,估算了三北防护林工程区2001年8月和2007年8月的植被覆盖度,分析了三北防护林工程区植被覆盖度的时空变化特征。结果表明:2001—2007年三北防护林工程区植被覆盖度变化较为明显,平均覆盖度增加了2.07%,其中吉林、山西、陕西和宁夏四省变化幅度最为显著,增加幅度分别达到27.37%、14.12%、9.29%和9.22%。研究区植被覆盖度增加的主要自然原因是降雨量的增加,主要人为原因是人们环境意识的提高以及国家实施的封山育林、退耕还林还草等一系列生态保护政策,特别是三北防护林体系建设工程。

关键词: 氮胁迫, 养分吸收与利用, 生物量分配, 水曲柳

Abstract: The Three-North Shelter Forest Program (TNSFP) covers 13 provinces of China, which brings great influence to the eco-environment of North, Northeast and Northwest China (Three-North Regions). In this paper, the vegetation  cover in the Three-North Regions was estimated by using a dimidiate pixel method based on the MODISNDVI data in August 2001 and 2007, with its spatiotemporal changes analyzed. In 2001-2007, the vegetation  cover in the Three North Regions had an obvious change. The mean coverage increased by 2.07%, and the increment in Jilin, Shanxi, Shaanxi, and Ningxia provinces reached to 27.37%, 14.12%, 9.29%, and 9.22%,
 respectively. The increase of the vegetation  cover was mainly caused by the increasing of precipitation and the enhancement of peoples’ environmental awareness, as well as the implementation of closing hillsides to facilitate afforestation, returning farmland to forest/grassland, and especially, the TNSFP.

Key words: Nitrogen stress, Nutrient uptake, Biomass distribution, Fraxinus mandshurica