Bioclimate and arbuscular mycorrhizal fungi regulate continental biogeographic variations in effect of nitrogen deposition on the temperature sensitivity of soil organic carbon decomposition,Land Degradation & Development

当前位置： X-MOL 学术 › Land Degrad. Dev. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Bioclimate and arbuscular mycorrhizal fungi regulate continental biogeographic variations in effect of nitrogen deposition on the temperature sensitivity of soil organic carbon decomposition
Land Degradation & Development ( IF 4.7 ) Pub Date : 2020-05-08 , DOI: 10.1002/ldr.3651
Qingkui Wang _{1,

2} , Xuechao Zhao _{1,

3} , Peng Tian _{1,

3,

4} , Shengen Liu _{1,

3} , Zhaolin Sun _{1,

3}

Affiliation

The temperature sensitivity (Q₁₀) of soil organic carbon (SOC) decomposition is an important parameter for those seeking accurate projections of SOC dynamics and its feedback on climate change in terrestrial ecosystems. However, how Q₁₀ responds to N deposition across environmental gradients and the underlying mechanism remain largely unresolved. We conducted a novel incubation experiment with periodically varying temperature based on the of soil origin sites to elucidate the responses of Q₁₀ to N addition across China. Our results demonstrated that N addition effects (NAEs) on Q₁₀ were negatively related to latitude and were strongly site dependent. Bioclimatic, edaphic, and microbial variables together explained 50.1% of the total variation in NAEs on Q₁₀, but bioclimate (16.0%) had the greater explanation than edaphic (11.8%) and microbial properties (6.3%). The response of soil exchangeable Ca²⁺ to N addition was a predictive power for NAEs on Q₁₀, contributing 7.2% relative importance in regulating this variation. Furthermore, arbuscular mycorrhizal fungi indicated by Glomeromycota were the best microbial predictor and contributed 10.9% relative importance in the variation regulating NAEs on Q₁₀. Overall, our results suggest that increasing N addition will increase the sensitivity of SOC decomposition to global warming and highlight the importance of bioclimate, exchangeable Ca²⁺, and arbuscular mycorrhizal fungi in predicting the response of Q₁₀ to N deposition in natural terrestrial ecosystems. The biogeographic variation in response of Q₁₀ to N deposition should be considered in carbon‐climate models to decrease the prediction uncertainties of SOC dynamics and its feedback to global warming.

更新日期：2020-05-08

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>