生物地球化学
生态系统
甲烷
土壤水分
氮气
环境科学
土壤科学
陆地生态系统
环境化学
草原
化学
生态学
农学
生物
有机化学
作者
Yunfeng Peng,Guanqin Wang,Fei Li,Guibiao Yang,Kai Fang,Li Liu,Shuqi Qin,Dianye Zhang,Guoying Zhou,Huajun Fang,Xuejun Liu,Chunyan Liu,Yuanhe Yang
标识
DOI:10.1021/acs.est.8b04561
摘要
Nitrogen (N) status has a great impact on methane (CH4) consumption by soils. Modeling studies predicting soil CH4 consumption assume a linear relationship between CH4 uptake and N addition rate. Here, we present evidence that a nonlinear relationship may better characterize changes in soil CH4 uptake with increasing N additions. By conducting a field experiment with eight N-input levels in a Tibetan alpine steppe, we observed a unimodal relationship; CH4 uptake increased at low to medium N levels but declined at high N levels. Environmental and microbial properties jointly determined this response pattern. The generality of the unimodal trend was further validated by two independent analyses: (i) we examined soil CH4 uptake across at least five N-input levels in upland ecosystems across China. A unimodal CH4 uptake-N addition rate relationship was observed in 3 out of 4 cases; and (ii) we performed a meta-analysis to explore the N-induced changes in soil CH4 uptake with increasing N additions across global upland ecosystems. Results showed that the changes in CH4 uptake exhibited a quadratic correlation with N addition rate. Overall, we suggest that the unimodal relationship should be considered in biogeochemistry models for accurately predicting soil CH4 consumption under global N enrichment.
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