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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (10): 3119-3126.doi: 10.13287/j.1001-9332.201710.026

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Effects of warming and precipitation exclusion on soil N2O fluxes in subtropical forests.

TANG Cai-di, ZHANG Zheng, CAI Xiao-zhen, GUO Jian-fen*, YANG Yu-sheng   

  1. School of Geographical Science/Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fujian Normal University, Fuzhou 350007, China
  • Received:2016-12-19 Revised:2017-07-29 Online:2017-10-18 Published:2017-10-18
  • Supported by:

    This work was supported by the National Major Scientific Research Program of China (2014CB954003).

Abstract: In order to explore how soil warming and precipitation exclusion influence soil N2O fluxes, we used related functional genes as markers, and four treatments were set up, i.e., control (CT), soil warming (W, 5 ℃ above the ambient temperature of the control), 50% precipitation reduction (P), soil warming plus 50% precipitation reduction (WP). The results showed that precipitation exclusion reduced soil ammonium nitrogen concentration significantly. Soil warming decreased soil N2O flux and soil denitrification potential significantly. Soil microbial biomass nitrogen (MBN) in warming treatment (W) and precipitation exclusion treatment (P) was significantly lo-wer than that in the control. The amoA gene abundance of AOA was negatively correlated with MBN and ammonium nitrogen contents, but neither soil nitrification potential nor soil N2O flux was correlated with the amoA gene abundance of AOA. Path analysis showed that the denitrification potential affected soil N2O flux directly, while microbial biomass phosphorus (MBP) and warming affected soil N2O flux indirectly through their direct effects on denitrification potential. Temperature might be the main driver of N2O flux in subtropical forest soils. Global warming would reduce N2O emissions from subtropical forest soils.