Variations of Terrestrial Net Primary Productivity in East Asia
Variations of Terrestrial Net Primary Productivity in East Asia
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DOI：
10.3319/tao.2012.03.28.01(a
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发表时间：
2012-08
影响因子：
0.8
通讯作者：
Fangmin Zhang;W. Ju;S. Shen;Shaoqiang Wang;Guirui Yu;Shijie Han
中科院分区：
文献类型：
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作者：
Fangmin Zhang;W. Ju;S. Shen;Shaoqiang Wang;Guirui Yu;Shijie Han
由于东亚陆地生态系统的异质性和复杂性，更好地了解气候变化与净初级生产力（NPP）分布之间的关系对于预测未来的碳动态非常重要。本研究的目的是利用基于过程的北方生态系统生产力模拟器（BEPS）模型分析1982年至2006年东亚（10°S - 55°N，60 - 155°E）NPP的时空格局。在进行区域模拟之前，利用现场观测的NPP对年度模拟NPP进行了验证，证明了BEPS对东亚不同生态系统NPP的模拟能力。模拟NPP呈现出东南-西北递减的分布，东南亚大部分地区高于1000 g C m^(-2) yr^ (-1)，中国西北部低于50 g C m^(-2) yr^-(1)。 1982年至2006年25年间，年均模拟NPP总量为11.27 Pg C yr^(-1)（~全球总量的18.78%）。NPP总量增加了7.33%，主要集中在研究区西北部。 NPP的变化由华北和西南地区的降水、华北和东北平原的水汽压亏差和降水、华南的辐射以及青藏高原的气温共同决定。气候是研究区内陆和北部NPP变化的主要调节因素，而叶面积指数变化是研究区东部NPP变化的主导因素。
Due to the heterogeneity and complexity of terrestrial ecosystems of East Asia, a better understanding of relationships between climate change and net primary productivity (NPP) distribution is important to predict future carbon dynamics. The objective of this study is to analyze the temporal-spatial patterns of NPP in East Asia (10°S - 55°N, 60 - 155°E) from 1982 to 2006 using the process-based Boreal Ecosystem Productivity Simulator (BEPS) model. Prior to the regional simulation, the annual simulated NPP was validated using field observed NPP demonstrating the ability of BEPS to simulate NPP in different ecosystems of East Asia.Simulated NPP exhibited a southeast-northwest decreasing distribution, above 1000 g C m^(-2) yr^ (-1) in most areas of Southeast Asia and below 50 g C m^(-2) yr^-(1) in northwestern China. The annual total of simulated NPP was 11.27 Pg C yr^(-1) (~18.78% of the global total) averaged over 25 years from 1982 to 2006. Total NPP increased by 7.33%, mainly in the northwestern part of the study area. The change of NPP was determined by precipitation in northern and southwestern regions, vapor pressure deficit and precipitation in North and Northeast Plains of China, radiation in South China, and temperature on the Tibetan Plateau. Climate was the main factor regulating the NPP trends in the interior and northern parts of the study area while the change in leaf area index was the factor dominating the trends of NPP in the eastern part of the study area.