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Forest conversion effect on soil nitrogen transformation and nitrous oxide emissions worldwide

文献类型： 外文期刊

作者： Xiao, Zhenggao 1 ; Yang, Shuting 1 ; Wang, Xie 3 ; Meng, Lei 4 ; Zhu, Tongbin 1 ; Mueller, Christoph 5 ; Elrys, Ahmed S. 4 ;

作者机构： 1.Chinese Acad Geol Sci, Inst Karst Geol, Karst Dynam Lab, MLR & GZAR, Guilin 541004, Peoples R China

2.Jiangnan Univ, Inst Environm Proc & Pollut Control, Sch Environm & Ecol, Wuxi 214122, Peoples R China

3.Sichuan Acad Agr Sci, Inst Agr Resources & Environm, Chengdu 610066, Peoples R China

4.Hainan Univ, Coll Trop Crops, Haikou 570228, Peoples R China

5.Justus Liebig Univ, Liebig Ctr Agroecol & Climate Impact Res, Giessen, Germany

6.Justus Liebig Univ Giessen, Inst Plant Ecol, Heinrich Buff Ring 26, D-35392 Giessen, Germany

7.Zagazig Univ, Fac Agr, Soil Sci Dept, Zagazig 44511, Egypt

8.Natl Observat & Res Stn, Pingguo Guangxi Karst Ecosyst, Pingguo, Guangxi, Peoples R China

关键词： Forest management; Nitrogen pollution; N 2 O emissions; Soil nitrogen transformation; Meta-analysis; Machine learning

期刊名称：GEODERMA （ 影响因子：6.6； 五年影响因子：7.3 ）

ISSN： 0016-7061

年卷期： 2025 年 459 卷

页码：

收录情况： SCI

摘要： Understanding soil nitrogen (N) storage and loss following forest conversion is crucial to evaluate land resource utilization and environmental impacts. However, forest conversion altering soil N dynamics and nitrous oxide (N2O) emissions and their driving factors remain largely unknown. Here, we conducted a global meta-analysis of 97 published papers to evaluate the effect of forest conversion (e.g., conversion of primary forests to secondary forests, managed plantations, grasslands, or croplands) on soil N transformations and N2O emissions. We found that forest conversion decreased gross N mineralization and ammonium concentration due to reduced soil microbial biomass, total carbon, and total N. Conversely, forest conversion overall increased autotrophic nitrification and N2O emissions due to the increased ammonia-oxidizing bacteria and archaea abundances. Primary forest converting to croplands and plantations notably increased soil N2O emissions in temperate and tropical zones. Structural equation model showed that increased ammonium and nitrate levels, and decreased total carbon were the main factors inducing soil N2O emissions in unfertilized ecosystems, while the increased nitrate was a key factor inducing soil N2O emissions in fertilized ecosystems. Altogether, our results suggest that forest conversion overall limits soil N storage while stimulating N2O emissions, highlighting the importance of conserving primary forests to reduce N losses and the negative impacts on the environment.

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