DOI: 10.1007/s10533-017-0307-z
Scopus记录号: 2-s2.0-85012241892
论文题名: Soil Ca alters processes contributing to C and N retention in the Oa/A horizon of a northern hardwood forest
作者: Minick K.J. ; Fisk M.C. ; Groffman P.M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 132, 期: 3 起始页码: 343
结束页码: 357
语种: 英语
英文关键词: 13C
; Acid deposition
; Calcium
; Carbon mineralization
; Isotope
; Microbial activity
; Nitrogen
Scopus关键词: acid deposition
; calcium
; carbon
; carbon sequestration
; dissolved organic carbon
; forest ecosystem
; isotopic analysis
; leaf litter
; microbial activity
; nitrogen
; soil carbon
; soil organic matter
; wood
; Hubbard Brook Experimental Forest
; New Hampshire
; United States
; Acer saccharum
英文摘要: Recent studies on the effects of calcium (Ca) additions on soil carbon (C) cycling in organic soil horizons present conflicting results, with some studies showing an increase in soil C storage and others a decrease. We tested the legacy effects of soil Ca additions on C and nitrogen (N) retention in a long-term incubation of soils from a plot-scale field experiment at the Hubbard Brook Experimental Forest, NH, USA. Two levels of Ca (850 and 4250 kg Ca/ha) were surface applied to field plots as the mineral wollastonite (CaSiO3) in summer of 2006. Two years after field Ca additions, Oa/A horizon soils were collected from field plots and incubated in the laboratory for 343 days to test Ca effects on C mineralization, dissolved organic carbon (DOC) export, and net N transformations. To distinguish mineralization of soil organic C (SOC) from that of more recent C inputs to soil, we incubated soils with and without added 13C-labeled sugar maple leaf litter. High Ca additions increased exchangeable Ca and pH compared to the control. While low Ca additions had little effect on mineralization of SOC or added litter C, high Ca additions reduced mineralization of SOC and enhanced mineralization of litter C. In litter-free incubations, δ13C of respired C was enriched in the high Ca treatment compared to the control, indicating that Ca suppressed mineralization of 13C-depleted SOC sources. Leaching of DOC and NH4 + were reduced by Ca additions in litter-free and litter-amended soils. Our results suggest that Ca availability in these organic soils influences mineralization of SOC and N primarily by stabilization processes and only secondarily through pH effects on organic matter solubility, and that SOC binding processes become important only with relatively large alterations of Ca status. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83301
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, United States; Department of Biology, Miami University, Oxford, OH, United States; Advanced Science Research Center and Brooklyn College, Department of Earth and Environmental Sciences, City University of New York, New York, NY, United States
Recommended Citation:
Minick K.J.,Fisk M.C.,Groffman P.M.. Soil Ca alters processes contributing to C and N retention in the Oa/A horizon of a northern hardwood forest[J]. Biogeochemistry,2017-01-01,132(3)