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应用生态学报 ›› 2009, Vol. 20 ›› Issue (11): 2743-2749.

• 研究报告 • 上一篇    下一篇

呼伦贝尔草原MODIS NDVI的时空变化特征

张宏斌1,2,3;杨桂霞1,2,3;吴文斌2,3;李刚2,3;陈宝瑞1,2,3;辛晓平1,2,3**   

  1. 1呼伦贝尔草原生态系统国家野外科学观测研究站, 北京 100081;2农业部资源遥感与数字农业重点开放实验室, 北京 100081|3中国农业科学院农业资源与农业区划研究所,北京 100081
  • 出版日期:2009-11-20 发布日期:2009-11-20

Spatiotemporal characteristics of MODIS NDVI in Hulunber Grassland

ZHANG Hong-bin1,2,3;YANG Gui-xia1,2,3|WU Wen-bin2,3;LI Gang2,3|CHEN Bao-rui1,2,3|XIN Xiao-ping1,2,3   

  1. 1Hulunber Grassland Ecosystem Observation and Research Station, Beijing 100081, China|2Ministry of Agriculture Key Laboratory of Resource Remote Sensing and Digital Agriculture, Beijing 100081, China|3Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Online:2009-11-20 Published:2009-11-20

摘要: 基于2000—2008年的MODIS NDVI数据,研究了呼伦贝尔草原4种主要草原类型(低地草甸、温性草原、温性草甸草原和山地草甸)年NDVImax的空间变化趋势、波动程度、出现时间.结果表明:2000—2008年,呼伦贝尔草原植被趋于恶化的形势较严峻;研究区类草原NDVImax平均值的年际波动明显,特别是温性草原NDVImax平均值的年际最大波动接近50%;在各等级草原面积的变化上,尽管NDVImax在(0.4,1]之间的草原平均面积约占研究区总面积的91%,说明呼伦贝尔草原植被状况总体较好,但NDVImax值在(0.2,0.4]、(0.8,1]之间的草原面积趋于减少,NDVImax在(0.4,0.8]之间的中高盖度草原面积趋于增加,总体形势不容乐观;66.25%的研究区草原植被状况趋于恶化,33.75%趋于好转;62.85%研究区的NDVImax出现在每年第193天至第225天(即7月中旬至8月初),该时期是呼伦贝尔草原植被最重要的生长季节.

关键词: 呼伦贝尔草原, ODIS, 空特征, 富营养化, 铁, 藻类生长, 藻毒素合成, 铁吸收调节蛋白

Abstract: Time-eries MODIS NDVI datasets from 2000 to 2008 were used to study the spatial change trend, fluctuation degree, and occurrence time of the annual NDVImax of four typical grassland types, i.e., lowland meadow, temperate steppe, temperate meadow steppe, and upland meadow, in Hulunber Grassland. In 2000-008, the vegetation in Hulunber Grassland presented an obvious deterioration trend. The mean annual NDVImax of the four grassland types had a great fluctuation, especially in temperate steppe where the maximum change in the mean value of annual NDVImax approximated to 50%. As for the area change of different grade grasslands, the areas with NDVImax between 0.4and 1 accounted for about 91% of the total grassland area, which suggested the good vegetation coverage in the Grassland. However, though the areas with NDVImax values in (0.4, 0.8] showed an increasing trend, the areas with NDVImax values in (0.2, 0.4] and (0.8, 1] decreased greatly in the study period. Overall, the deteriorating grassland took up about 66.25% of the total area, and the restoring grassland took the rest. There was about 62.85% of the grassland whose NDVImax occurred between the 193rd day and the 225th day in each year, indicating that this period was the most important vegetation growth season in Hulunber Grassland.

Key words: Hulunber Grassland, MODIS, spatiotemporal characteristics, eutrophication, iron, algae growth, microcystin synthesis, ferric uptake regulation protein (Fur).