Nitrogen and phosphorus addition impact soil N2O emission in a secondary tropical forest of South China

硝化作用 矿化(土壤科学) 热带森林 氮气 生态系统 营养物 环境化学 环境科学 化学 农学 动物科学
作者
Faming Wang,Jian Li,Xiaoli Wang,Wei Zhang,Bi Zou,Deborah A. Neher,Zhian Li
出处
期刊:Scientific Reports [Nature Portfolio]
卷期号:4 (1) 被引量:64
标识
DOI:10.1038/srep05615
摘要

Nutrient availability greatly regulates ecosystem processes and functions of tropical forests. However, few studies have explored impacts of N addition (aN), P addition (aP) and N × P interaction on tropical forests N₂O fluxes. We established an N and P addition experiment in a tropical forest to test whether: (1) N addition would increase N₂O emission and nitrification, and (2) P addition would increase N₂O emission and N transformations. Nitrogen and P addition had no effect on N mineralization and nitrification. Soil microbial biomass was increased following P addition in wet seasons. aN increased 39% N₂O emission as compared to control (43.3 μgN₂O-N m(-2)h(-1)). aP did not increase N₂O emission. Overall, N₂O emission was 60% greater for aNP relative to the control, but significant difference was observed only in wet seasons, when N₂O emission was 78% greater for aNP relative to the control. Our results suggested that increasing N deposition will enhance soil N₂O emission, and there would be N × P interaction on N₂O emission in wet seasons. Given elevated N deposition in future, P addition in this tropical soil will stimulate soil microbial activities in wet seasons, which will further enhance soil N₂O emission.
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