摘要
基于EOS/MODIS卫星遥感资料的分析表明,2000-2004年江河源地区陆地植被平均年NPP为82.04 gC.m-2,相当于同期全国陆地植被年NPP的23%,其中2001年的年NPP最小,只有78.04gC.m-2,2002年最大,为85.44 gC.m-2.根据年NPP分布显示,黄河源区的植被生长状况要好于长江源区,其中在黄河源东南部陆地植被的年NPP>250 gC.m-2,为江河源区植被年生长最大的区域;该地区的植被年NPP最小值的区域分布在长江源的西北部地区,年NPP大部分<50 gC.m-2.江河源地区植被的年NPP表现为显著的年际变化特征,不同地区年NPP的变化特征各不相同;高寒草甸的年NPP为该地区所有陆地植被年NPP中最大,其5 a平均值为89.38 gC.m-2,其次为高寒草原和灌木及草本植被;由于地处高寒地区,温度成为影响该地区陆地植被净初级生产力的主要因素.
Based on the MOD17A3 data of NASA EOS/MODIS （Terra）, the terrestrial NPP in the source regions of Yangtze and Yellow Rivers during 2000 to 2004 is analyzed. The annual NPP of the regions is 82. 04 gC·m^-2 during the five years, with the maximum of 85. 44 gC·m^-2 in 2002, and minimum of 78.04 gC·m^-2 in 2001. The NPP in the region of Yellow River is higher than that of Yangtze River, and the maximum, exceeding 250 gC·m^-2, occurs in the southeasternarea of the source region of Yellow Rivers, and the minimum, less than 50 gC·m^-2, appears in the northwest of the source region of Yangtze River. The annual NPP is changing from year to year. The annual NPP of alpine meadow is the highest among all vegetations in the regions, and of course, an annual fluctuation appears. Regression analysis shows that temperature is the key factor controlling the terrestrial NPP in the source regions Yangtze and Yellow Rivers.
出处
《冰川冻土》
CSCD
北大核心
2006年第4期512-518,共7页
Journal of Glaciology and Geocryology
基金
国家自然科学基金重点项目(40233034)
中国气象局气候变化专项"未来50年中国陆地生态系统碳循环模拟"(CCSF2005-2-QH04)
中意环保合作项目"中国南水北调工程(东线)可持续水资源综合管理研究"(SWIMER-08)资助
关键词
江河源区
MODIS
净初级生产力
生态环境
source regions of the Yangtze and Yellow Rivers
MODIS
net primary production （NPP）
eco-environment
