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Ecosystem scale trade-off in nitrogen acquisition pathways

作 者:Deng MF, Liu LL*, Jiang L, Liu WX, Wang X, Li SP, Yang S, Wang B
影响因子: 
刊物名称: Nature Ecology & Evolution
出版年份: 2018
卷: DOI: 10.1038/s41559-018-0677-1  期:    页码: 

文章摘要 : 

The nitrogen (N) cycle in terrestrial ecosystems is strongly influenced by resorption before litter fall and by mineralization after litter fall. Although both resorption and mineralization make N available to plants and are influenced by climate, their linkage in a changing environment remains largely unknown. Here, our synthesis study shows that, at the global scale, increasing N-resorption efficiency negatively affects the N-mineralization rate. As temperature and precipitation increase, the increasing rates of N cycling closely correspond to a shift from the more conservative resorption pathway to the mineralization pathway. Furthermore, ecosystems with faster N-cycle rates support plant species that have higher foliar N:P ratios and microbial communities with lower fungi:bacteria ratios. Our study shows an ecosystem scale trade-off in N-acquisition pathways. We propose that incorporating the dynamic interaction between N resorption and N mineralization into Earth system models will improve the simulation of nutrient constraints on ecosystem productivity.


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