Spatial variability and major controlling factors of CO2 sink strength in Asian terrestrial ecosystems:: evidence from eddy covariance data
Spatial variability and major controlling factors of CO2 sink strength in Asian terrestrial ecosystems:: evidence from eddy covariance data
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DOI：
10.1111/j.1365-2486.2008.01646.x
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发表时间：
2008-10-01
影响因子：
11.6
通讯作者：
Tang, Yanhong
中科院分区：
文献类型：
--
作者：
Kato, Tomomichi;Tang, Yanhong
亚洲陆地生态系统覆盖面积广阔，气候和生态系统特性多种多样。该地区生态系统二氧化碳通量的观测在持续时间和空间密度上都在增加，但尚未进行综合。我们调查了亚洲陆地 49 个地点通过涡度协方差方法获得的 CO2 通量观测数据。大多数站点（49 个站点中的 44 个）的测量是在 2000 年之后开始的。生态系统对 CO2 的净吸收量（NEE）在不同站点和年份之间差异很大，亚洲北半球、温带和热带地区的平均值分别为 -132.6 +/- 73.7、-250.1 +/- 206.1 和 -180.1 +/- 361.7 g C m(-2) yr(-1)。从亚洲北部到热带，地点之间的差异逐渐增加。站点平均年NEE与年平均气温（T-air）呈线性相关，与降水量呈对数相关。多元回归分析和逐步分析表明，光合有效辐射（PAR）和T-air是年度NEE最重要的预测因子。研究结果表明，亚洲陆地生态系统目前是重要的二氧化碳净汇，汇的强度很大程度上受温度、湿度和光照条件的控制。
Asian terrestrial ecosystems cover an extensive area characterized by a large variety in climates and ecosystem properties. The observations of ecosystem CO2 flux in this area are increasing both in duration and spatial density, but no synthesis has yet been conducted. We surveyed CO2 flux observation data obtained by eddy covariance methods at 49 sites in terrestrial Asia. The measurements at most sites (44 of 49) began after 2000. The net ecosystem uptake of CO2 (NEE) varied greatly among sites and years and averaged -132.6 +/- 73.7, -250.1 +/- 206.1, and -180.1 +/- 361.7 g C m(-2) yr(-1), in boreal, temperate, and tropical Asia, respectively, and the coefficient of variation among sites increased from boreal to tropical Asia. The site-averaged annual NEE was correlated linearly with the mean annual temperature (T-air) and also correlated logarithmically with the precipitation. Multiple regression analysis and stepwise analysis indicated that photosynthetic active radiation (PAR) and T-air were the most significant predictors of the annual NEE. The study results suggest that Asian terrestrial ecosystems are currently significant net CO2 sinks and that the sink strength is largely controlled by temperature, moisture, and light conditions.