DOI: 10.1007/s10533-015-0126-z
Scopus记录号: 2-s2.0-84941879434
论文题名: Lumbricid earthworm effects on incorporation of root and leaf litter into aggregates in a forest soil, New York State
作者: Yavitt J.B. ; Fahey T.J. ; Sherman R.E. ; Groffman P.M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 2 起始页码: 261
结束页码: 273
语种: 英语
英文关键词: Earthworms
; Forest soil
; Isotope labeling
; New York State
; Soil aggregates
; Sugar maple forest
Scopus关键词: afforestation
; earthworm
; forest soil
; isotopic analysis
; laboratory method
; leaf litter
; macroaggregate
; microorganism
; mineralization
; organic matter
; soil aggregate
; soil nutrient
; timescale
; New York [New York (STT)]
; New York [United States]
; United States
; Acer saccharum
; Lumbricidae
英文摘要: Plant litter, microorganisms, and soil minerals assemble into aggregates in soils. Soil aggregates protect organic matter and are a primary site for storage of stabilized soil carbon, and thus many studies have evaluated how agriculture and soil disturbance affects aggregates. However, relatively little is known about aggregation in forest soils and the role of non-native earthworms. In a temperate forest where earthworm invasion has greatly reduced soil C stocks, we measured the abundance of aggregate fractions in plots with and without earthworms. We also quantified the flow of 13C from leaf litter and root litter into soil aggregates and evaluated how lumbricid earthworms affect this process. Macroaggregates comprised the majority of the bulk soil mass in these fine-textured soils both in the presence and absence of earthworms. The principal effect of earthworms on the composition of macroaggregates was to greatly reduce the proportion of both coarse POM and mineral-sorbed C in them. Earthworms also reduced the proportion of free microaggregates in soil. Two years after addition of isotope-labeled leaf litter most of the label was recovered in macroaggregates in the form of microaggregates held within them. Earthworms also greatly increased the proportion of root-derived C that was incorporated into macroaggegates, thereby apparently accelerating the process of root C incorporation into soil aggregates. However, much of the C incorporated into aggregates over a three-year time scale remained labile and was eventually mineralized. These observations indicate that earthworm effects on C mineralization may exceed effects on stabilization over longer time scales than for previous laboratory experiments. © 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/83466
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 Natural Resources, Cornell University, Ithaca, NY, United States; Cary Institute for Ecosystem Studies, Millbrook, NY, United States
Recommended Citation:
Yavitt J.B.,Fahey T.J.,Sherman R.E.,et al. Lumbricid earthworm effects on incorporation of root and leaf litter into aggregates in a forest soil, New York State[J]. Biogeochemistry,2015-01-01,125(2)