Vegetation structural change since 1981 significantly enhanced the terrestrial carbon sink
Vegetation structural change since 1981 significantly enhanced the terrestrial carbon sink
复制标题
1981年以来的植被结构变化显着增强了陆地碳汇
DOI：
10.1038/s41467-019-12257-8
复制
发表时间：
2019-09-18
影响因子：
16.6
通讯作者：
Lu, Xuehe
中科院分区：
文献类型：
--
作者：
Chen, Jing M.;Ju, Weimin;Lu, Xuehe
卫星观测表明，自1981年以来，全球叶面积指数（LAI）增加，但这种植被结构变化对全球陆地碳循环的影响尚未得到系统的评估。通过基于过程的诊断生态系统模型，我们发现，仅叶面积指数的增加就占陆地碳汇的12.4%（95 ± 5 Pg C），而CO2施肥，氮沉降和气候变化的其他驱动因素（温度、辐射和降水）分别贡献了47.0%、1.1%和-28.6%的汇。1981年之前这些驱动因素过去变化的遗留效应是1981年至2016年剩余65.5%累积汇的原因。这些结果完善了土地汇对各种驱动因素的归属，并将有助于限制预测模型，这些模型在模拟植被变化及其对全球碳循环的影响方面往往具有很大的不确定性。
Satellite observations show that leaf area index (LAI) has increased globally since 1981, but the impact of this vegetation structural change on the global terrestrial carbon cycle has not been systematically evaluated. Through process-based diagnostic ecosystem modeling, we find that the increase in LAI alone was responsible for 12.4% of the accumulated terrestrial carbon sink (95 ± 5 Pg C) from 1981 to 2016, whereas other drivers of CO2fertilization, nitrogen deposition, and climate change (temperature, radiation, and precipitation) contributed to 47.0%, 1.1%, and −28.6% of the sink, respectively. The legacy effects of past changes in these drivers prior to 1981 are responsible for the remaining 65.5% of the accumulated sink from 1981 to 2016. These results refine the attribution of the land sink to the various drivers and would help constrain prognostic models that often have large uncertainties in simulating changes in vegetation and their impacts on the global carbon cycle.