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Spatial patterns of terrestrial net ecosystem productivity in China during 1981-2000

机译:1981-2000年中国陆地净生态系统生产力的空间格局

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摘要

As the third largest country in the world, China has highly variable environmental condition and ecological pattern in both space and time. Quantification of the spatial-temporal pattern and dynamic of terrestrial ecosystem carbon cycle in China is of great significance to regional and global carbon budget. In this study, we used a high-resolution climate database and an improved ecosystem process-based model to quantify spatio-temporal pattern and dynamic of net ecosystem productivity (NEP) in China and its responses to climate change during 1981 to 2000. The results showed that NEP increased from north to south and from northeast to southwest. Positive NEP (carbon sinks) occurred in the west of Southwest China, southeastern Tibet, Sanjiang Plain, Da Hinggan Mountains and the mid-west of North China. Negative NEP (carbon sources) were mainly found in Central China, the south of Southwest China, the north of Xinjiang, west and north of Inner Mongolia, and parts of North China. From the 1980s to 1990s, the increasing trend of NEP occurred in the middle of Northeast China Plain and the Loess Plateau and decreasing trends mainly occurred in a greater part of Central China. In the study period, natural forests had minimal carbon uptake, while grassland and shrublands accounted for nearly three fourths of the total carbon terrestrial uptakes in China during 1981 —2000.
机译:作为世界第三大国家,中国的时空环境和生态格局变化很大。中国陆地生态系统碳循环的时空格局和动态量化对区域和全球碳预算具有重要意义。在这项研究中,我们使用了高分辨率的气候数据库和改进的基于生态系统过程的模型来量化中国在1981年至2000年间的时空格局和净生态系统生产力动态及其对气候变化的响应。结果表明,NEP从北向南和从东北向西南增加。 NEP(碳汇)的正值发生在中国西南部,西藏东南部,三江平原,大兴安岭和华北中西部。负NEP(碳源)主要分布在中国中部,西南部南部,新疆北部,内蒙古西部和北部以及华北部分地区。从1980年代到1990年代,NEP的增加趋势发生在东北平原和黄土高原中部,而减少的趋势主要发生在中部的大部分地区。在研究期间,天然林的碳吸收量最小,而1981-2000年间,草地和灌木丛占中国陆地碳吸收总量的近四分之三。

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