Amazon forest response to CO2 fertilization dependent on plant phosphorus acquisition
Amazon forest response to CO2 fertilization dependent on plant phosphorus acquisition
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DOI：
10.1038/s41561-019-0404-9
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发表时间：
2019-09-01
影响因子：
18.3
通讯作者：
Lapola, David M.
中科院分区：
文献类型：
--
作者：
Fleischer, Katrin;Rammig, Anja;Lapola, David M.
全球陆地模式目前预测，亚马逊雨林在未来将继续作为碳汇，这主要是由于大气中二氧化碳（CO 2）浓度的上升。亚马逊流域部分地区的土壤磷贫瘠在很大程度上控制了其功能，但在全球模式集合中，磷有效性的作用尚未被考虑——例如，在第五次气候模式比较项目期间。本文利用14个陆地生态系统模型对AmazonFACE计划中的自由空气CO2富集实验进行了模拟。研究表明，与碳模型和碳氮模型的估算值相比，在15年的时间里，磷的有效性将预计的二氧化碳诱导的生物量碳增长降低了约50%，降至79 +/- 63 g cm (-2) yr（-1）。我们的研究结果表明，该地区对气候变化的适应能力可能远低于之前的假设。由于模型中考虑的植物磷利用和获取策略的差异，在磷激活模型之间的生物量碳响应变化很大，范围从5到140 g cm (-)2 yr（-1）。因此，亚马逊森林的响应取决于个体间磷获取和利用策略的相互作用和相对贡献，以及这些过程在二氧化碳升高的情况下可以上调到何种程度。
Global terrestrial models currently predict that the Amazon rainforest will continue to act as a carbon sink in the future, primarily owing to the rising atmospheric carbon dioxide (CO 2 ) concentration. Soil phosphorus impoverishment in parts of the Amazon basin largely controls its functioning, but the role of phosphorus availability has not been considered in global model ensembles-for example, during the Fifth Climate Model Intercomparison Project. Here we simulate the planned free-air CO2 enrichment experiment AmazonFACE with an ensemble of 14 terrestrial ecosystem models. We show that phosphorus availability reduces the projected CO2-induced biomass carbon growth by about 50% to 79 +/- 63 g C m(-2) yr(-1) over 15 years compared to estimates from carbon and carbon-nitrogen models. Our results suggest that the resilience of the region to climate change may be much less than previously assumed. Variation in the biomass carbon response among the phosphorus-enabled models is considerable, ranging from 5 to 140 g C m(-)2 yr(-1), owing to the contrasting plant phosphorus use and acquisition strategies considered among the models. The Amazon forest response thus depends on the interactions and relative contributions of the phosphorus acquisition and use strategies across individuals, and to what extent these processes can be upregulated under elevated CO2.