High-level nitrogen additions accelerate soil respiration reduction over time in a boreal forest,Ecology Letters

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High-level nitrogen additions accelerate soil respiration reduction over time in a boreal forest
Ecology Letters ( IF 7.6 ) Pub Date : 2022-06-28 , DOI: 10.1111/ele.14065
Aijun Xing _{1,

2} , Enzai Du ₃ , Haihua Shen _{1,

2} , Longchao Xu ₁ , Mengying Zhao _{1,

2} , Xiuyuan Liu ₁ , Jingyun Fang _{1,

4}

Affiliation

Increased nitrogen (N) inputs are widely recognised to reduce soil respiration (Rs), but how N deposition affects the temporal dynamics of Rs remains unclear. Using a decade-long fertilisation experiment in a boreal larch forest (Larix gmelini) in northeast China, we found that the effects of N additions on Rs showed a temporal shift from a positive effect in the short-term (increased by 8% on average in the first year) to a negative effect over the longer term (decreased by 21% on average in the 11th year). The rates of decrease in Rs for the higher N levels were almost twice as high as those of the low N level. Our results suggest that the reduction in Rs in response to increased N input is accelerated by high-level N additions, and experimental high N applications are likely to overestimate the contribution of N deposition to soil carbon sequestration in a boreal forest.

更新日期：2022-06-28

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