Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15819 |
Carbon limitation overrides acidification in mediating soil microbial activity to nitrogen enrichment in a temperate grassland | |
Qiushi Ning; Stephan Hä; ttenschwiler; Xiaotao Lü; Paul Kardol; Yunhai Zhang; Cunzheng Wei; Chengyuan Xu; Jianhui Huang; Ang Li; Junjie Yang; Jing Wang; Yang Peng; Josep Peñ; uelas; Jordi Sardans; Jizheng He; Zhihong Xu; Yingzhi Gao; Xingguo Han | |
2021-08-16 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | Higher ecosystem nitrogen (N) inputs resulting from human activities often suppress soil microbial biomass and respiration, thereby altering biogeochemical cycling. Soil acidification and carbon (C) limitation may drive these microbial responses, yet their relative importance remains elusive, which limits our understanding of the longer term effects of increasing N inputs. In a field experiment with continuous N addition at seven different rates from 0 to 50 g N m−2 year−1 over 6 years in a temperate grassland of Inner Mongolia, China, we examined the responses of soil microbial biomass and respiration to changes in soil acidity and C availability by adding lime and/or glucose to soil samples. Soil microbial biomass and respiration did only weakly respond to increasing soil pH, but increased strongly in response to higher C availability with increasing N addition rates. Soil net N immobilization increased in response to glucose addition, and soil microbial biomass increased at higher rates than microbial respiration along the gradient of previous N addition rates, both suggesting increasingly reinforced microbial C limitation with increasing N addition. Our results provide clear evidence for strong N-induced microbial C limitation, but only little support for soil acidity effects within the initial pH range of 4.73–7.86 covered by our study. Field data support this conclusion by showing reduced plant C allocation belowground in response to N addition, resulting in soil microbial C starvation over the long term. In conclusion, soil microbial biomass and respiration under N addition were strongly dependent on C availability, most likely originating from plant belowground C inputs, and was much less affected by changes in soil pH. Our data help clarify a long-standing debate about how increasing N input rates affect soil microbial biomass and respiration, and improve the mechanistic understanding of the linkages between ecosystem N enrichment and C cycling. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/335947 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Qiushi Ning,Stephan Hä,ttenschwiler,et al. Carbon limitation overrides acidification in mediating soil microbial activity to nitrogen enrichment in a temperate grassland[J]. Global Change Biology,2021. |
APA | Qiushi Ning.,Stephan Hä.,ttenschwiler.,Xiaotao Lü.,Paul Kardol.,...&Xingguo Han.(2021).Carbon limitation overrides acidification in mediating soil microbial activity to nitrogen enrichment in a temperate grassland.Global Change Biology. |
MLA | Qiushi Ning,et al."Carbon limitation overrides acidification in mediating soil microbial activity to nitrogen enrichment in a temperate grassland".Global Change Biology (2021). |
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