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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Contribution of increasing CO2 and climate change to the carbon cycle in China's ecosystems
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Contribution of increasing CO2 and climate change to the carbon cycle in China's ecosystems

机译：二氧化碳和气候变化对中国生态系统碳循环的贡献

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Atmospheric CO2 and China's climate have changed greatly during 1961–2000. The influence of increased CO2 and changing climate on the carbon cycle of the terrestrial ecosystems in China is still unclear. In this article we used a process-based ecosystem model, Biome-BGC, to assess the effects of changing climate and elevated atmospheric CO2 on terrestrial China's carbon cycle during two time periods: (1) the present (1961–2000) and (2) a future with projected climate change under doubled CO2 (2071–2110). The effects of climate change alone were estimated by driving Biome-BGC with a fixed CO2 concentration and changing climate, while the CO2 fertilization effects were calculated as the difference between the results driven by both increasing CO2 and changing climate and those of variable climate alone. Model simulations indicate that during 1961–2000 at the national scale, changes in climate reduced carbon storage in China's ecosystems, but increasing CO2 compensated for these adverse effects of climate change, resulting in an overall increase in the carbon storage of China's ecosystems despite decreases in soil carbon. The interannual variability of the carbon cycle was associated with climate variations. Regional differences in climate change produced differing regional carbon uptake responses. Spatially, reductions in carbon in vegetation and soils and increases in litter carbon were primarily caused by climate change in most parts of east China, while carbon in vegetation, soils, and litter increased for much of west China. Under the future scenario (2071–2110), with a doubling CO2, China will experience higher precipitation and temperature as predicted by the Hadley Centre HadCM3 for the Intergovernmental Panel on Climate Change Fourth Assessment. The concomitant doubling of CO2 will continue to counteract the negative effects of climate change on carbon uptake in the future, leading to an increase in carbon storage relative to current levels. This study highlights the role of CO2 fertilization in the carbon budget of China's ecosystems, although future studies should include other important processes such as land use change, human management (e.g., fertilization and irrigation), environmental pollution, etc.
机译：1961-2000年期间，大气中的二氧化碳和中国的气候发生了很大变化。二氧化碳增加和气候变化对中国陆地生态系统碳循环的影响尚不清楚。在本文中，我们使用了基于过程的生态系统模型Biome-BGC来评估气候变化和大气CO2升高对中国陆地碳循环在以下两个时期的影响：（1）当前（1961-2000）和（2 ），在二氧化碳增加一倍的情况下（2071-210年），预计气候变化的未来。通过以固定的CO2浓度和气候变化驱动Biome-BGC来估算仅气候变化的影响，而将CO2施肥效果计算为由CO2增加和气候变化驱动的结果与仅气候变化的结果之间的差异。模型模拟表明，在1961-2000年的全国范围内，气候变化降低了中国生态系统的碳储量，但是增加的CO2弥补了气候变化的这些不利影响，尽管中国的生态系统碳排放量有所减少，但总体上导致了中国生态系统的碳储量增加。土壤碳。碳循环的年际变化与气候变化有关。气候变化的区域差异导致了不同的区域碳吸收反应。在空间上，植被和土壤中碳的减少以及凋落物碳的增加主要是由华东大部分地区的气候变化引起的，而在中国西部大部分地区，植被，土壤和凋落物中的碳增加。在未来的情景（2071-2110）下，二氧化碳将增加一倍，中国将经历政府间气候变化专门委员会第四次评估的哈德利中心HadCM3预测的更高的降水量和温度。随之而来的CO2倍增将继续抵消未来气候变化对碳吸收的负面影响，从而导致相对于当前水平的碳存储增加。尽管未来的研究应包括其他重要过程，例如土地用途变化，人为管理（例如施肥和灌溉），环境污染等，但本研究强调了CO2施肥在中国生态系统碳预算中的作用。

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