文献类型：期刊文献

英文题名：Environmental Variables Better Explain Changes in Potential Nitrification and Denitrification Activities than Microbial Properties in a Thinning Subtropical Forest Soil

作者：Li, Niu[2] Yao, Liangjin[1] Wu, Chuping[1] Jiang, Bo[1] Wu, Ming[2]

第一作者：李妞

机构：[1] Zhejiang Academy of Forestry, Hangzhou, 310023, China; [2] Wetland Ecosystem Research Station of Hangzhou Bay, Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, 311400, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240142786)

语种：英文

外文关键词：Bacteria - Forestry - Fungi - Nitrification - Nitrogen - Organic carbon - Physicochemical properties - Soils - Structural properties - Tropics

摘要：Subtropical forests play a crucial role in the global carbon and nitrogen cycles, with soil nitrification and denitrification processes being key regulators of nitrogen availability in forest soils. However, our understanding of how forest management practices, such as thinning, influence soil nitrogen transformation processes and their microbial drivers remains limited. To address this knowledge gap, we conducted a study in a subtropical forest in China, with three thinning treatments: control (0%), intermediate thinning (10-15%), and heavy thinning (20-25%). We investigated the effects of thinning intensity on potential nitrification rates (PNA), denitrification rates (PDA), and microbial communities, and explored the relationships among soil physicochemical properties, microbial community structure, and nitrogen transformation rates. Our results showed that thinning significantly increased PNA and decreased PDA, with the magnitude of the effects increasing with thinning intensity. Bacterial community structure responded markedly to thinning, while fungal community structure remained relatively stable. Notably, the composition and diversity of bacterial and fungal communities did not significantly influence nitrification and denitrification processes. In contrast, soil physicochemical properties, such as pH, organic carbon content, and nitrogen forms, emerged as the primary drivers of soil nitrogen transformation processes. This finding highlights the importance of regulating soil physicochemical properties in the management of forest soil nitrogen. Our study reveals the underlying mechanism by which forest thinning intensity directly affects soil nitrogen transformation processes through altering soil physicochemical properties rather than microbial community characteristics. These findings provide new insights and scientific basis for the rational regulation of nitrogen transformation processes in forest soils. ? 2024, The Authors. All rights reserved.