DOI: 10.1111/gcb.13751
论文题名: Plant litter chemistry alters the content and composition of organic carbon associated with soil mineral and aggregate fractions in invaded ecosystems
作者: Tamura M. ; Suseela V. ; Simpson M. ; Powell B. ; Tharayil N.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 10 起始页码: 4002
结束页码: 4018
语种: 英语
英文关键词: mineral-associated carbon
; plant invasion
; Polygonum cuspidatum
; Pueraria lobata
; soil aggregates
; soil organic matter
Scopus关键词: Lobata
; Poaceae
; Polygonaceae
; Polygonum cuspidatum
; Pueraria montana var. lobata
英文摘要: Through the input of disproportionate quantities of chemically distinct litter, invasive plants may potentially influence the fate of organic matter associated with soil mineral and aggregate fractions in some of the ecosystems they invade. Although context dependent, these native ecosystems subjected to prolonged invasion by exotic plants may be instrumental in distinguishing the role of plant–microbe–mineral interactions from the broader edaphic and climatic influences on the formation of soil organic matter (SOM). We hypothesized that the soils subjected to prolonged invasion by an exotic plant that input recalcitrant litter (Japanese knotweed, Polygonum cuspidatum) would have a greater proportion of plant-derived carbon (C) in the aggregate fractions, as compared with that in adjacent soil inhabited by native vegetation that input labile litter, whereas the soils under an invader that input labile litter (kudzu, Pueraria lobata) would have a greater proportion of microbial-derived C in the silt-clay fraction, as compared with that in adjacent soils that receive recalcitrant litter. At the knotweed site, the higher C content in soils under P. cuspidatum, compared with noninvaded soils inhabited by grasses and forbs, was limited to the macroaggregate fraction, which was abundant in plant biomarkers. The noninvaded soils at this site had a higher abundance of lignins in mineral and microaggregate fractions and suberin in the macroaggregate fraction, partly because of the greater root density of the native species, which might have had an overriding influence on the chemistry of the above-ground litter input. At the kudzu site, soils under P. lobata had lower C content across all size fractions at a 0–5 cm soil depth despite receiving similar amounts of Pinus litter. Contrary to our prediction, the noninvaded soils receiving recalcitrant Pinus litter had a similar abundance of plant biomarkers across both mineral and aggregate fractions, potentially because of the higher surface area of soil minerals at this site. The plant biomarkers were lower in the aggregate fractions of the P. lobata-invaded soils, compared with noninvaded pine stands, potentially suggesting a microbial co-metabolism of pine-derived compounds. These results highlight the complex interactions among litter chemistry, soil biota, and minerals in mediating soil C storage in unmanaged ecosystems; these interactions are particularly important under global changes that may alter plant species composition and hence the quantity and chemistry of litter inputs in terrestrial ecosystems. © 2017 John Wiley & Sons Ltd 资助项目: Suseela, V.
; Department of Plant and Environmental Sciences, Clemson UniversityUnited States
; 电子邮件: vsuseel@clemson.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60783
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Plant and Environmental Sciences, Clemson University, Clemson, SC, United States; Department of Physical and Environmental Sciences, University of Toronto, Scarborough, Toronto, ON, Canada; Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, SC, United States
Recommended Citation:
Tamura M.,Suseela V.,Simpson M.,et al. Plant litter chemistry alters the content and composition of organic carbon associated with soil mineral and aggregate fractions in invaded ecosystems[J]. Global Change Biology,2017-01-01,23(10)