生物群落
通量网
生态系统
环境科学
碳通量
土壤呼吸
呼吸
生产力
生态系统呼吸
碳循环
植被(病理学)
全球变化
土壤碳
碳纤维
环境化学
陆地生态系统
气候变化
异养
二氧化碳
生物量(生态学)
大气科学
初级生产
生态学
总有机碳
微生物种群生物学
生物
涡度相关法
经济
病理
宏观经济学
地质学
细菌
医学
遗传学
作者
Heng Huang,Salvatore Calabrese,Ignacio Rodrı́guez-Iturbe
标识
DOI:10.1073/pnas.2115283118
摘要
Soil heterotrophic respiration (Rh) represents an important component of the terrestrial carbon cycle that affects whether ecosystems function as carbon sources or sinks. Due to the complex interactions between biological and physical factors controlling microbial growth, Rh is uncertain and difficult to predict, limiting our ability to anticipate future climate trajectories. Here we analyze the global FLUXNET 2015 database aided by a probabilistic model of microbial growth to examine the ecosystem-scale dynamics of Rh and identify primary predictors of its variability. We find that the temporal variability in Rh is consistently distributed according to a Gamma distribution, with shape and scale parameters controlled only by rainfall characteristics and vegetation productivity. This distribution originates from the propagation of fast hydrologic fluctuations on the slower biological dynamics of microbial growth and is independent of biome, soil type, and microbial physiology. This finding allows us to readily provide accurate estimates of the mean Rh and its variance, as confirmed by a comparison with an independent global dataset. Our results suggest that future changes in rainfall regime and net primary productivity will significantly alter the dynamics of Rh and the global carbon budget. In regions that are becoming wetter, Rh may increase faster than net primary productivity, thereby reducing the carbon storage capacity of terrestrial ecosystems.
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