DOI: 10.1007/s10533-015-0123-2
Scopus记录号: 2-s2.0-84941878319
论文题名: Nitrogen addition changes grassland soil organic matter decomposition
作者: Riggs C.E. ; Hobbie S.E. ; Bach E.M. ; Hofmockel K.S. ; Kazanski C.E.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 2 起始页码: 203
结束页码: 219
语种: 英语
英文关键词: Carbon
; Fertilization
; Microbial respiration
; Nutrient Network
; Soil aggregate
; Wet sieving
Scopus关键词: anthropogenic effect
; carbon
; carbon sequestration
; decomposition
; fertilizer application
; grassland
; microbial activity
; nitrogen
; nutrient availability
; nutrient enrichment
; reservoir
; soil aggregate
; soil organic matter
; soil texture
; Great Plains
英文摘要: Humans have dramatically increased the deposition and availability of nutrients, such as nitrogen (N), worldwide. Soil organic matter (SOM) is a significant global reservoir of carbon (C); however, the effects of N enrichment on this large, heterogeneous C stock are unclear. Nitrogen has variable effects on the biological, chemical, and physical factors that determine SOM pool mean residence time; consequently, we predicted that N enrichment would have distinct effects on SOM pools, including the pool that is readily available for microbial decomposition, as well as the pools that have been stabilized against microbial decomposition via aggregate occlusion and mineral association. We addressed this gap in knowledge by measuring the effects of N addition on different SOM pools at five grassland experiments in the US Central Great Plains that participate in the Nutrient Network and have been fertilized for three or five years. Overall, N addition decreased microbial respiration of unoccluded OM by as much as 29 % relative to control plots, and consequently, decreased C loss from this pool. Furthermore, N addition tended to increase soil aggregation and C occlusion in large macro-aggregates. These results suggest that N addition will increase C sequestration by slowing the decomposition of SOM, as well as stabilizing SOM against microbial decomposition in aggregate-occluded pools. However, the effects of N on all pools studied varied among sites, possibly due to site variation in soil texture. Consequently, increased sequestration of soil C in response to N enrichment may not be universal across grasslands. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83464
Appears in Collections: 气候减缓与适应 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Ecology, Evolution, and Behavior, University of Minnesota, Saint Paul, MN, United States; Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA, United States; Illinois Natural History Survey, Champaign, IL, United States
Recommended Citation:
Riggs C.E.,Hobbie S.E.,Bach E.M.,et al. Nitrogen addition changes grassland soil organic matter decomposition[J]. Biogeochemistry,2015-01-01,125(2)