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China's terrestrial carbon balance: Contributions from multiple global change factors

机译：中国的陆地碳平衡：来自多个全球变化因素的贡献

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摘要

The magnitude, spatial, and temporal patterns of the terrestrial carbon sink and the underlying mechanisms remain uncertain and need to be investigated. China is important in determining the global carbon balance in terms of both carbon emission and carbon uptake. Of particular importance to climate-change policy and carbon management is the ability to evaluate the relative contributions of multiple environmental factors to net carbon source and sink in China's terrestrial ecosystems. Here the effects of multiple environmental factors (climate, atmospheric CO_2, ozone pollution, nitrogen deposition, nitrogen fertilizer application, and land cover/land use change) on net carbon balance in terrestrial ecosystems of China for the period 1961-2005 were modeled with newly developed, detailed historical information of these changes. For this period, results from two models indicated a mean land sink of 0.21 Pg C per year, with a multimodel range from 0.18 to 0.24 Pg C per year. The models' results are consistent with field observations and national inventory data and provide insights into the biogeochemical mechanisms responsible for the carbon sink in China's land ecosystems. In the simulations, nitrogen deposition and fertilizer applications together accounted for 61 percent of the net carbon storage in China's land ecosystems in recent decades, with atmospheric CO 2 increases and land use also functioning to stimulate carbon storage. The size of the modeled carbon sink over the period 1961-2005 was reduced by both ozone pollution and climate change. The modeled carbon sink in response to per unit nitrogen deposition shows a leveling off or a decline in some areas in recent years, although the nitrogen input levels have continued to increase.
机译：陆地碳汇的规模，空间和时间格局及其潜在机制仍然不确定，需要进行研究。中国在确定全球碳平衡方面，在碳排放和碳吸收方面都非常重要。对于气候变化政策和碳管理而言，特别重要的是能够评估多种环境因素对中国陆地生态系统净碳源和碳汇的相对贡献。本文使用新的模型模拟了1961-2005年间中国陆地生态系统的多种环境因素（气候，大气CO_2，臭氧污染，氮沉降，氮肥施用和土地覆盖/土地利用变化）对净碳平衡的影响。这些变化的详细历史信息。在此期间，两个模型的结果表明，每年的平均地面沉降为0.21 Pg C，多模型范围为每年0.18至0.24 PgC。这些模型的结果与实地观察和国家清单数据一致，并提供了对造成中国土地生态系统碳汇的生物地球化学机制的见解。在模拟中，近几十年来，氮沉积和肥料的使用共占中国土地生态系统净碳储量的61％，大气中的CO 2增加，土地使用也起到刺激碳储量的作用。臭氧污染和气候变化都降低了1961-2005年期间碳汇模型的规模。尽管氮输入水平持续增加，但近年来响应某些区域氮沉降的模拟碳汇显示出某些地区趋于稳定或下降。

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