title: Exogenous nutrients and carbon resource change the responses of soil organic matter decomposition and nitrogen immobilization to nitrogen deposition.
abstract: It is unclear whether exogenous nutrients and carbon (C) additions alter substrate immobilization to deposited nitrogen (N) during decomposition. In this study, we used laboratory microcosm experiments and (15)N isotope tracer techniques with five different treatments including N addition, N+non-N nutrients addition, N+C addition, N+non-N nutrients+C addition and control, to investigate the coupling effects of non-N nutrients, C addition and N deposition on forest floor decomposition in subtropical China. The results indicated that N deposition inhibited soil organic matter and litter decomposition by 66% and 38%, respectively. Soil immobilized (15)N following N addition was lowest among treatments. Litter (15)N immobilized following N addition was significantly higher and lower than that of combined treatments during the early and late decomposition stage, respectively. Both soil and litter extractable mineral N were lower in combined treatments than in N addition treatment. Since soil N immobilization and litter N release were respectively enhanced and inhibited with elevated non-N nutrient and C resources, it can be speculated that the N leaching due to N deposition decreases with increasing nutrient and C resources. This study should advance our understanding of how forests responds the elevated N deposition.
authors.affiliation: College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China.
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.affiliation: College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China.|Collaborative Innovation Center of Jiangxi Typical Trees Cultivation and Utilization, Jiangxi Agricultural University, Nanchang 330045, China.
authors.forename: Song-Ze
authors.initials: SZ
authors.lastname: Wan
authors.affiliation: College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China.|Collaborative Innovation Center of Jiangxi Typical Trees Cultivation and Utilization, Jiangxi Agricultural University, Nanchang 330045, China.
authors.forename: Xiang-Min
authors.initials: XM
authors.lastname: Fang
authors.affiliation: College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China.
authors.forename: Fang-Chao
authors.initials: FC
authors.lastname: Wang
authors.affiliation: College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China.|Collaborative Innovation Center of Jiangxi Typical Trees Cultivation and Utilization, Jiangxi Agricultural University, Nanchang 330045, China.
authors.forename: Fu-Sheng
authors.initials: FS
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry* / Q000378:metabolism; D002245:Carbon Dioxide / Q000737:chemistry / Q000378:metabolism; D002681:China; D003247:Conservation of Natural Resources / Q000379:methods / Q000706:statistics & numerical data; D032486:Cunninghamia / Q000254:growth & development / Q000378:metabolism; D065928:Forests; D006813:Humidity; D007700:Kinetics; D009584:Nitrogen / Q000737:chemistry* / Q000378:metabolism; D009587:Nitrogen Isotopes / Q000378:metabolism; D009930:Organic Chemicals / Q000737:chemistry* / Q000378:metabolism; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014197:Trees / Q000254:growth & development / Q000378:metabolism
chemical_list: D009587:Nitrogen Isotopes; D009930:Organic Chemicals; D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon; D009584:Nitrogen