Li Longhui, Wang Ying-Ping, Beringer Jason, Shi Hao, Cleverly James, Cheng Lei, Eamus Derek, Huete Alfredo, Hutley Lindsay, Lu Xingjie, Piao Shilong, Zhang Lu, Zhang Yongqiang, Yu Qiang
School of Life Sciences, University of Technology Sydney, Sydney, Australia.
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.
Sci Rep. 2017 Sep 15;7(1):11720. doi: 10.1038/s41598-017-11063-w.
Non-forest ecosystems (predominant in semi-arid and arid regions) contribute significantly to the increasing trend and interannual variation of land carbon uptake over the last three decades, yet the mechanisms are poorly understood. By analysing the flux measurements from 23 ecosystems in Australia, we found the the correlation between gross primary production (GPP) and ecosystem respiration (R) was significant for non-forest ecosystems, but was not for forests. In non-forest ecosystems, both GPP and R increased with rainfall, and, consequently net ecosystem production (NEP) increased with rainfall. In forest ecosystems, GPP and R were insensitive to rainfall. Furthermore sensitivity of GPP to rainfall was dominated by the rainfall-driven variation of LAI rather GPP per unit LAI in non-forest ecosystems, which was not correctly reproduced by current land models, indicating that the mechanisms underlying the response of LAI to rainfall should be targeted for future model development.
非森林生态系统（主要分布在半干旱和干旱地区）在过去三十年里对陆地碳吸收的增加趋势和年际变化有显著贡献，但其机制尚不清楚。通过分析澳大利亚23个生态系统的通量测量数据，我们发现非森林生态系统中总初级生产力（GPP）与生态系统呼吸（R）之间的相关性显著，而森林生态系统则不然。在非森林生态系统中，GPP和R均随降雨量增加，因此净生态系统生产力（NEP）也随降雨量增加。在森林生态系统中，GPP和R对降雨不敏感。此外，在非森林生态系统中，GPP对降雨的敏感性主要由降雨驱动的叶面积指数（LAI）变化主导，而非单位LAI的GPP，当前的陆地模型未能正确再现这一点，这表明未来模型开发应针对LAI对降雨响应的潜在机制。
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