DOI: 10.1016/j.apsoil.2019.103473
论文题名: Earthworm abundance and functional group diversity regulate plant litter decay and soil organic carbon level: A global meta-analysis
作者: Huang W. ; González G. ; Zou X.
刊名: Applied Soil Ecology
ISSN: 9291393
出版年: 2020
卷: 150 语种: 英语
英文关键词: Anecic worms
; Endogeic worms
; Epigeic worms
; Forest floor mass
; Litter decomposition
; Soil carbon
英文摘要: A previous review of earthworm impacts on greenhouse-gas emissions concluded that earthworms elevated soil CO2 emissions with no apparent influence on soil organic carbon (SOC), especially in laboratory incubations and in agroecosystems. This conclusion suggests that the elevated soil CO2 emissions may come from enhanced plant litter decomposition. Despite the known important role of earthworms on regulating ecosystem processes, a quantitative analysis of the relationship between earthworms and decomposition in global terrestrial ecosystems is still missing. Here, we present a quantitative synthesis of earthworm effects on plant litter decomposition and SOC based on 340 observations from 69 independent studies. We found a positive correlation between earthworm density and the rate of plant litter decay, and that the presence of earthworms doubled the amount of litter mass loss on average. The presence of all three (anecic, epigeic and endogeic) earthworm functional groups was associated with higher litter mass loss than when either one or two functional groups were present. Anecic earthworms caused the strongest effect on litter mass loss, followed by epigeic earthworms, and there was no apparent influence by endogeic worms. Although the effect of earthworms on SOC was not significant based on all observations, the presence of any two of the three functional groups alone or two (epigeic and endogeic, or anecic and endogeic) and three (anecic, epigeic and endogeic) functional groups together decreased SOC concentrations. Our results indicate that the effect of earthworms on litter and SOC decay depends strongly on earthworm functional groups and diversity, and that a high diversity of earthworm functional groups accelerates litter mass loss and SOC decay. We anticipate that changes in land management practices are likely to alter ecosystem carbon cycling through alteration of earthworm abundance and diversity. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158132
Appears in Collections: 气候变化与战略
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作者单位: College of Biology and the Environment, Nanjing Forestry University, 159 Longpan Road, Nanjing, Jiangsu 210037, China; Department of Environmental Sciences, College of Natural Sciences, University of Puerto Rico, P.O. Box 70377, San Juan, PR 00936-8377, United States; International Institute of Tropical Forestry, USDA Forest Service, Jardín Botánico Sur, 1201 Calle Ceiba, Río Piedras, PR 00926-1119, United States
Recommended Citation:
Huang W.,González G.,Zou X.. Earthworm abundance and functional group diversity regulate plant litter decay and soil organic carbon level: A global meta-analysis[J]. Applied Soil Ecology,2020-01-01,150