Altered trends in carbon uptake in China's terrestrial ecosystems under the enhanced summer monsoon and warming hiatus.
Altered trends in carbon uptake in China's terrestrial ecosystems under the enhanced summer monsoon and warming hiatus.
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DOI：
10.1093/nsr/nwz021
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发表时间：
2019-05
影响因子：
20.6
通讯作者：
Yu G
中科院分区：
文献类型：
--
作者：
He H;Wang S;Zhang L;Wang J;Ren X;Zhou L;Piao S;Yan H;Ju W;Gu F;Yu S;Yang Y;Wang M;Niu Z;Ge R;Yan H;Huang M;Zhou G;Bai Y;Xie Z;Tang Z;Wu B;Zhang L;He N;Wang Q;Yu G
中国陆地生态系统的碳收支与气候变化具有很强的耦合性。在过去的十年中，中国经历了剧烈的气候变化，其特征是夏季风增强和变暖减缓。然而，中国陆地生态系统净生产力（NEP）在气候变化下的变化趋势还没有很好的记录。本文利用三个生态系统模式模拟了1982-2010年中国NEP的时空变化，并量化了夏季风加强和暖间断对中国四个不同气候区NEP变化的贡献。我们的研究结果表明，NEP从1982-2000年期间的下降趋势-5.95 Tg C/yr 2（减少汇）到2000-10年期间的上升趋势14.22 Tg C/yr 2（增强汇）的十年尺度变化。这种转变主要是由加强夏季风，刺激碳吸收，和变暖的间歇，减少了NEP趋势的下降。与气候效应的56.3%的贡献相比，大气CO2浓度和氮沉降的贡献相对较小（分别为8.6%和11.3%）。总之，在全球变暖中断的背景下，夏季风的加强是一个关键的气候因素，提高了中国的碳吸收，由于光合作用和呼吸的不对称响应。本研究不仅揭示了中国近几十年来生态系统固碳的变化规律，而且为了解其他季风区生态系统碳动态提供了一定的参考。
The carbon budgets in terrestrial ecosystems in China are strongly coupled with climate changes. Over the past decade, China has experienced dramatic climate changes characterized by enhanced summer monsoon and decelerated warming. However, the changes in the trends of terrestrial net ecosystem production (NEP) in China under climate changes are not well documented. Here, we used three ecosystem models to simulate the spatiotemporal variations in China's NEP during 1982–2010 and quantify the contribution of the strengthened summer monsoon and warming hiatus to the NEP variations in four distinct climatic regions of the country. Our results revealed a decadal-scale shift in NEP from a downtrend of –5.95 Tg C/yr2 (reduced sink) during 1982–2000 to an uptrend of 14.22 Tg C/yr2 (enhanced sink) during 2000–10. This shift was essentially induced by the strengthened summer monsoon, which stimulated carbon uptake, and the warming hiatus, which lessened the decrease in the NEP trend. Compared to the contribution of 56.3% by the climate effect, atmospheric CO2 concentration and nitrogen deposition had relatively small contributions (8.6 and 11.3%, respectively) to the shift. In conclusion, within the context of the global-warming hiatus, the strengthening of the summer monsoon is a critical climate factor that enhances carbon uptake in China due to the asymmetric response of photosynthesis and respiration. Our study not only revealed the shift in ecosystem carbon sequestration in China in recent decades, but also provides some insight for understanding ecosystem carbon dynamics in other monsoonal areas.
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影响因子：
11.6
作者：
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通讯作者：
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影响因子：
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作者：
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