DOI: 10.1007/s10533-016-0202-z
Scopus记录号: 2-s2.0-84964061359
论文题名: Rapid fine root C and N mineralization in a northern temperate forest soil
作者: Santos F. ; Nadelhoffer K. ; Bird J.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 128, 期: 2018-01-02 起始页码: 187
结束页码: 200
语种: 英语
英文关键词: 13C
; 15N
; DIRT
; Fine roots decomposition
; Litter manipulation treatments
; Soil organic matter
Scopus关键词: boreal forest
; carbon
; deciduous forest
; decomposition
; fine root
; forest soil
; inorganic nitrogen
; litterfall
; mineralization
; nitrogen
; nutrient dynamics
; soil organic matter
; soil stabilization
; temperate environment
; Michigan
; United States
; Acer rubrum
英文摘要: While fine roots (≤2-mm diameter) are major suppliers of carbon (C) and nitrogen (N) to northern temperate and boreal forest soils, our understanding of how long-term plant and N inputs affect fine root decomposition rates and the amount of root-derived organic matter (OM) stabilized in forest soils is incomplete. We examined the influence of long-term aboveground and/or belowground litter and inorganic N additions on mineralization and vertical transport of fine root-derived C and N during the first 2 years of decomposition of dead fine root in the field. We used an existing long-term field manipulation experiment located in a northern Michigan forest; with (i) exclusion of above and below-ground inputs, (ii) exclusion of belowground inputs alone, or (iii) inorganic N additions, for 6 years prior to the addition of dual-labeled (13C and 15N) Acer rubrum fine roots. After 2 years in soil, labeled fine roots rapidly decomposed in all treatments, with only 20.7 % of root 13C and 35.8 % of root 15N recovered in soil (0–20 cm depth). This was likely because of the combined effects of (1) root litter chemistry, (2) processing of root litter by exotic earthworms, and (3) the low stabilization potential of the coarse-textured soil at the site. Neither the long-term exclusion of litter inputs nor increased inorganic N additions influenced root mineralization rates; and there were no detectable effects of either treatment on CO2 efflux or on dissolved organic C loss. During the 2-year study, exclusion of litter inputs did not affect root C retention in soil but lowered C:N ratios of roots recovered in that treatment. Inorganic N additions had no significant effect on root-derived C or N retention in the soil. Our results show that fine root litter turns over faster than previously thought in coarse-textured temperate forests soils that lack effective OM stabilization mechanisms. © 2016, Springer International Publishing Switzerland.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83398
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: School of Natural Sciences, University of California, Merced, CA, United States; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, United States; School of Earth and Environmental Sciences, Queens College, City University of New York, Flushing, New York, NY, United States; The Graduate Center of the City University of New York, New York, NY, United States
Recommended Citation:
Santos F.,Nadelhoffer K.,Bird J.A.. Rapid fine root C and N mineralization in a northern temperate forest soil[J]. Biogeochemistry,2016-01-01,128(2018-01-02)