DOI: 10.1111/gcb.12414
论文题名: Sustained effects of atmospheric [CO2] and nitrogen availability on forest soil CO2 efflux
作者: Oishi A.C. ; Palmroth S. ; Johnsen K.H. ; Mccarthy H.R. ; Oren R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 4 起始页码: 1146
结束页码: 1160
语种: 英语
英文关键词: Automated soil respiration measurements
; FACE
; Nitrogen fertilization
; Pinus taeda
; Primary productivity
; Soil water content
Scopus关键词: carbon dioxide
; fertilizer application
; forest soil
; nutrient availability
; primary production
; soil nitrogen
; soil respiration
; soil water
; Pinus taeda
; carbon dioxide
; nitrogen
; soil
; water
; chemistry
; loblolly pine
; plant leaf
; soil
; temperature
; tree
; United States
; Carbon Dioxide
; Nitrogen
; North Carolina
; Pinus taeda
; Plant Leaves
; Soil
; Temperature
; Trees
; Water
英文摘要: Soil CO2 efflux (Fsoil) is the largest source of carbon from forests and reflects primary productivity as well as how carbon is allocated within forest ecosystems. Through early stages of stand development, both elevated [CO2] and availability of soil nitrogen (N; sum of mineralization, deposition, and fixation) have been shown to increase gross primary productivity, but the long-term effects of these factors on Fsoil are less clear. Expanding on previous studies at the Duke Free-Air CO2 Enrichment (FACE) site, we quantified the effects of elevated [CO2] and N fertilization on Fsoil using daily measurements from automated chambers over 10 years. Consistent with previous results, compared to ambient unfertilized plots, annual Fsoil increased under elevated [CO2] (ca. 17%) and decreased with N (ca. 21%). N fertilization under elevated [CO2] reduced Fsoil to values similar to untreated plots. Over the study period, base respiration rates increased with leaf productivity, but declined after productivity saturated. Despite treatment-induced differences in aboveground biomass, soil temperature and water content were similar among treatments. Interannually, low soil water content decreased annual Fsoil from potential values - estimated based on temperature alone assuming nonlimiting soil water content - by ca. 0.7% per 1.0% reduction in relative extractable water. This effect was only slightly ameliorated by elevated [CO2]. Variability in soil N availability among plots accounted for the spatial variability in Fsoil, showing a decrease of ca. 114 g C m-2 yr-1 per 1 g m-2 increase in soil N availability, with consistently higher Fsoil in elevated [CO2] plots ca. 127 g C per 100 ppm [CO2] over the +200 ppm enrichment. Altogether, reflecting increased belowground carbon partitioning in response to greater plant nutritional needs, the effects of elevated [CO2] and N fertilization on Fsoil in this stand are sustained beyond the early stages of stand development and through stabilization of annual foliage production. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61940
Appears in Collections: 影响、适应和脆弱性
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作者单位: Division of Environmental Science and Policy, Nicholas School of the Environment, Duke University, Durham, 27708-0328 NC, United States; Coweeta Hyrdologic Laboratory, Southern Research Station, USDA Forest Service, 3160 Coweeta Lab Road, Otto, 28763, United States; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå SE-901 83, Sweden; Southern Research Station, USDA Forest Service, 3041 Cornwallis Road, Research Triangle Park, 27709 NC, United States; Department of Microbiology and Plant Biology, University of Oklahoma, 770 Van Vleet Oval, Norman, 73019 OK, United States; Department of Civil and Environmental Engineering, Pratt School of Engineering, Duke University, Durham, 27708-0271 NC, United States
Recommended Citation:
Oishi A.C.,Palmroth S.,Johnsen K.H.,et al. Sustained effects of atmospheric [CO2] and nitrogen availability on forest soil CO2 efflux[J]. Global Change Biology,2014-01-01,20(4)