DOI: 10.1111/gcb.12715
论文题名: Surficial gains and subsoil losses of soil carbon and nitrogen during secondary forest development
作者: Mobley M.L. ; Lajtha K. ; Kramer M.G. ; Bacon A.R. ; Heine P.R. ; Richter D.D.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 2 起始页码: 986
结束页码: 996
语种: 英语
英文关键词: Land use change
; Loblolly pine
; Long-term experiment
; Reforestation
; Secondary forest development
; Soil fractionation
; Soil nitrogen
; Soil organic carbon
Scopus关键词: coniferous tree
; isotopic fractionation
; land use change
; reforestation
; secondary forest
; soil carbon
; soil nitrogen
; soil organic matter
; subsoil
; United States
; Pinus taeda
; carbon
; nitrogen
; soil
; biodiversity
; chemistry
; forest
; soil
; United States
; Biodiversity
; Carbon
; Forests
; Nitrogen
; Soil
; South Carolina
英文摘要: Reforestation of formerly cultivated land is widely understood to accumulate above- and belowground detrital organic matter pools, including soil organic matter. However, during 40 years of study of reforestation in the subtropical southeastern USA, repeated observations of above- and belowground carbon documented that significant gains in soil organic matter (SOM) in surface soils (0-7.5 cm) were offset by significant SOM losses in subsoils (35-60 cm). Here, we extended the observation period in this long-term experiment by an additional decade, and used soil fractionation and stable isotopes and radioisotopes to explore changes in soil organic carbon and soil nitrogen that accompanied nearly 50 years of loblolly pine secondary forest development. We observed that accumulations of mineral soil C and N from 0 to 7.5 cm were almost entirely due to accumulations of light-fraction SOM. Meanwhile, losses of soil C and N from mineral soils at 35 to 60 cm were from SOM associated with silt and clay-sized particles. Isotopic signatures showed relatively large accumulations of forest-derived carbon in surface soils, and little to no accumulation of forest-derived carbon in subsoils. We argue that the land use change from old field to secondary forest drove biogeochemical and hydrological changes throughout the soil profile that enhanced microbial activity and SOM decomposition in subsoils. However, when the pine stands aged and began to transition to mixed pines and hardwoods, demands on soil organic matter for nutrients to support aboveground growth eased due to pine mortality, and subsoil organic matter levels stabilized. This study emphasizes the importance of long-term experiments and deep measurements when characterizing soil C and N responses to land use change and the remarkable paucity of such long-term soil data deeper than 30 cm. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61703
Appears in Collections: 影响、适应和脆弱性
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作者单位: University Program in Ecology, Duke University, Durham, NC, United States; Nicholas School of the Environment, Duke University, Durham, NC, United States; Department of Crop and Soil Science, Oregon State University, Corvallis, OR, United States; Soil and Water Science Department, University of Florida, Gainesville, FL, United States; School of Forest Resources and Conservation, University of Florida, Gainesville, FL, United States
Recommended Citation:
Mobley M.L.,Lajtha K.,Kramer M.G.,et al. Surficial gains and subsoil losses of soil carbon and nitrogen during secondary forest development[J]. Global Change Biology,2015-01-01,21(2)