2001—2010年三江源区草地净生态系统生产力估算

发布时间：2018-07-03 00:39

本文选题：三江源 + 高寒草甸　；参考：《环境科学研究》2017年01期

【摘要】：三江源区位于青藏高原腹地,是我国长江、黄河、澜沧江三大河流的发源地.为了准确估算该地区草地生态系统的净生态系统生产力,收集整理了2001—2010年青藏高原10个通量观测站点的观测数据,构建了三江源区草地生态系统NEP(net ecosystem production,净生态系统生产力)估算模型,并在站点尺度进行了模型参数化和精度验证;结合区域尺度气象和遥感数据,估算了三江源区草地生态系统NEP.结果表明:12001—2010年三江源区草地生态系统多年平均NEP空间分布具有明显的空间异质性,大部分地区表现为碳汇,NEP(以C计)平均值为41.8 g/(m~2·a).2三江源区草地生态系统NEP呈波动增加趋势,从2001年的20.0 g/(m~2·a)增至2010年的82.5 g/(m~2·a);除2002年表现为弱碳源外,其余年份均表现为碳汇,并以2010年碳汇能力为最强.32001—2010年三江源区草地生态系统NEP平均年增长率为5.4 g/m~2;NEP年际变化率空间分布显示,大部分地区NEP呈增加趋势,仅有东南部和中部部分区域NEP呈下降趋势.研究显示,2001—2010年三江源区草地生态系统表现为碳汇,并且由于气候的暖湿化趋势,碳汇强度总体表现为增强.
[Abstract]:Located in the hinterland of Qinghai-Tibet Plateau, Sanjiangyuan region is the birthplace of three major rivers of Yangtze River, Yellow River and Lancang River in China. In order to estimate the net ecosystem productivity of grassland ecosystem in this area accurately, the observation data of 10 flux observation stations in the Qinghai-Tibet Plateau from 2001 to 2010 were collected and collated. The estimation model of net ecosystem productivity (NEP (net ecosystem production,) of grassland ecosystem in the source region of three rivers is constructed, and the model parameterization and precision verification are carried out at the site scale, and combined with the regional scale meteorological and remote sensing data, The grassland ecosystem of Sanjiangyuan region was estimated. The results showed that the spatial distribution of annual mean NEP in the grassland ecosystem of the three Rivers from 2001 to 2010 had obvious spatial heterogeneity. In most areas, the average value of carbon sequestration (in C) was 41.8 g / (m ~ (2 a). 2. The grassland ecosystem of the source region of the three rivers showed an increasing trend of fluctuation, from 20.0 g / (m ~ (2) a) in 2001 to 82.5 g / (m ~ (2) a);) in 2010, except for the weak carbon source in 2002, the other years showed carbon sink. The average annual NEP growth rate of grassland ecosystem was 5.4 g / m ~ (2) per year in 2010, and the spatial distribution of interannual change rate of NEP showed that the NEP increased in most areas. Only in the southeastern and central parts of the NEP showed a downward trend. The results showed that the grassland ecosystem in the source region of the three Rivers from 2001 to 2010 was a carbon sink, and the intensity of the carbon sink was enhanced because of the trend of warming and humidification of the climate.
【作者单位】：中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院大学;中国气象局气象干部培训学院辽宁分院;中国环境科学研究院;
【基金】：中国工程院咨询研究项目(2014-XZ-31) 科技基础性工作专项(2015FY110700) 国家科技支撑计划项目(2013BAC03B00)
【分类号】：S812

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