title: Nitrogen and phosphorus addition impact soil N₂O emission in a secondary tropical forest of South China.
abstract: 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.
authors.affiliation: 1] Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510160, PR China [2].
authors.forename: Faming
authors.initials: F
authors.lastname: Wang
authors.affiliation: 1] Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510160, PR China [2].
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510160, PR China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510160, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510160, PR China.
authors.forename: Bi
authors.initials: B
authors.lastname: Zou
authors.affiliation: Department of Plant and Soil Science, University of Vermont, Burlington, VT 05405, U.S.A.
authors.forename: Deborah A
authors.initials: DA
authors.lastname: Neher
authors.affiliation: Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510160, PR China.
authors.forename: Zhian
authors.initials: Z
authors.lastname: Li
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000378:metabolism; D002681:China; D009569:Nitric Oxide / Q000032:analysis / Q000096:biosynthesis*; D009584:Nitrogen / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D065947:Rainforest; D012987:Soil / Q000737:chemistry*; D014197:Trees / Q000378:metabolism*
chemical_list: D000393:Air Pollutants; D012987:Soil; D010758:Phosphorus; D009569:Nitric Oxide; D009584:Nitrogen