中文摘要：

植被净生态系统生产力（Net Ecosystem Productivity,NEP）是估算区域上植被碳源、碳汇的重要指标.以东北三省为研究区,基于EOS/MODIS遥感资料,结合气象数据,对2000—2010年NEP的分布情况和时间变化特征进行分析,结果表明,2000—2010年我国东北三省大部分地区为碳汇区域,NEP值处于0~300 g C·m-2·a-1之间,碳源地主要集中在吉林省西北部和黑龙江省西南部地区;林地的碳汇能力最大,NEP均值为176.74 g C·m-2·a-1,其次为灌丛175.02 g C·m-2·a-1,农田、湿地、草地的碳汇能力依次减弱;11年间,东北三省约66.36%的地区NEP呈下降趋势,即过半数地区固碳能力都在减弱,固碳能力大幅增强的地区集中在辽宁省长白山西南段和西辽低山丘陵,NEP上升的斜率在5~15之间.结合年均温和年降水对逐年的东三省年平均NEP进行分析,结果显示,NEP与降水呈正相关关系,且相关性显著;NEP与温度呈负相关关系,但是相关性不够显著;NEP值受温度、降水的极值影响很明显.本文基于多时相遥感数据展开了区域尺度的碳源汇模拟,为遥感数据在此领域的应用和碳储蓄动态变化研究提供了理论依据和方法借鉴.

英文摘要：

Net Ecosystem Productivity（ NEP） is an important parameter when estimating regional carbon source / sink. Based on EOS / MODIS data and meteorological data,NEP was calculated in Heilongjiang,Jilin and Liaoning from 2000 to 2010. The temporal characteristics of NEP were analyzed,the results showed that during 2000 to 2010 most areas in three provinces of Northeast China were carbon sinks,NEP was between 0 ~ 300 g C · m-2·a-1,carbon sources were in Northwestern Jinlin and Southwestern Heilongjiang; the mean NEP of forest（ 176. 74 g C·m-2·a-1） was the highest,followed by shrub（ 175. 02 g C·m-2·a-1）,the carbon sequestration ability of farmland,wetland and grass decreased successively. In nearly 66. 36% of the territory of the study area,NEP tended to decline,which meaned their carbon sequestration were weaker. Area with increased carbon sequestration were in Southeastern Changbai Mountain in Liaoning province and hills in western Liaoning,where the increasing slope was between 5 ~ 15. The correlation coefficient between NEP and precipitation was significant;NEP was sensitive to the extreme value of the temperature and precipitation,the trend of NEP was consistent with the fluctuation of precipitation. This paper conducted regional simulation of carbon sink /source,providing theoretical basis and methodological references for the usage of remote sensing data in the related study areas.