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Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (6): 150-157.doi: 10.11707/j.1001-7488.20210617

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Progress in Studies of Responses to Phosphorus Addition of Soil Nitrous Oxide Emissions from Forest Soil

Xiang Zheng1,Minmin Cao1,Xiaofang Ji1,Wanli Fang2,Shenglong Liu2,Jiang Jiang1,*   

  1. 1. Co-Innovation Center for the Sustainable Forestry in Southern China Key Laboratory of Soil and Water Conservation and Ecological Restoration in Jiangsu Province, Nanjing Forestry University Nanjing 210037
    2. Fengyang Mountain Administration of Zhejiang Fengyang Mountain-Baishanzu National Nature Reserve Longquan 323700
  • Received:2020-07-14 Online:2021-06-25 Published:2021-08-06
  • Contact: Jiang Jiang

Abstract:

Rising nitrous oxide (N2O) concentrations in the atmosphere have exacerbated global warming. Forest soil plays an important role in regulating atmospheric N2O concentration. Recently,application of phosphate (P) fertilizer was increased for improving forest productivity. However,compared with the well-known effects of nitrogen (N) deposition or N addition on N2O emission from forest soil,how the P addition affects the N2O emission from forest soil is still limited and lacks in-depth understanding. This study presents a review of the responses and mechanism of N2O emissions from forest soils to P addition. Due to the different responses of plant and soil microorganisms (microbial biomass,community composition and microbial activity) to P addition,phosphorus addition can increase,reduce or not change the N2O emission from forest soil. Overall,phosphorus addition alleviated the P-limitation of plants and soil microbes. The effect of P addition on soil N2O emissions was governed by the initial status of soil nutrients (N,P). P addition can promote the absorption of inorganic N by plant roots and/or microbial N immobilization,thus reducing the N2O emission from forest soil,it can also stimulate the activity of nitrification and denitrification bacteria,subsequently promote the N2O emission from forest soil. Furthermore,phosphorus addition may also regulate soil N2O emissions by alleviating soil acidification,affecting arbuscular mycorrhizal fungi symbiosis and litter decomposition,which requires further studies. In the future forest management,the addition of phosphorus can be considered as a strategy for reduction of greenhouse gas emission.

Key words: phosphorus addition, nitrous oxide, plant, soil microbes, nitrification, denitrification

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