DOI: 10.1016/j.geoderma.2019.114111
论文题名: Exotic herbaceous species interact with severe drought to alter soil N cycling in a semi-arid shrubland
作者: Pérez Castro S. ; Esch E.H. ; Eviner V.T. ; Cleland E.E. ; Lipson D.A.
刊名: Geoderma
ISSN: 167061
出版年: 2020
卷: 361 语种: 英语
英文关键词: Climate change
; Coastal sage scrub
; Exotic species invasion
; Soil nitrogen
Scopus关键词: Biodiversity
; Competition
; Drought
; Ecosystems
; Leaching
; Mineralogy
; Nitrification
; Plants (botany)
; Soils
; Coastal sage scrub
; Competitive advantage
; Exotic species
; Mediterranean-type ecosystems
; Net primary production
; Rainfall manipulations
; Soil nitrogen
; Temporal variability
; Climate change
; climate change
; drought stress
; herb
; invasive species
; nitrogen cycle
; scrub
; semiarid region
; severe weather
; shrubland
; soil nitrogen
英文摘要: Mediterranean-type ecosystems are increasingly threatened by climate change and exotic annual species, jeopardizing the native communities and their global biodiversity. In these systems, soil nitrogen (N) limits net primary production, and its availability can be influenced by both of these stressors. To understand the interactive effects of droughts and exotic herbaceous species on soil N, we monitored the temporal variability of soil inorganic N, net N mineralization, net nitrification, and NO3 - leaching under native- and exotic-dominated stands exposed to rainfall manipulation plots in a Mediterranean-type shrub-dominated community. Increasing drought severity resulted in the accumulation of soil NH4 + and NO3 -, with a more pronounced increase in exotic-dominated plots. Increased net N mineralization and net nitrification and reduced leaching losses were observed as mechanisms of inorganic N accumulation. In comparison to soils under native plants, soils under exotic plants had enhanced leaching losses upon soil rewetting. We propose that distinct traits of exotic annual herbaceous species associated with higher N inputs, faster turnover, and reduced temporal uptake determine the changes in N cycling in response to droughts. Severe droughts and exotic plants may produce a larger, more vulnerable pool of N that is prone to losses while providing a competitive advantage to promote exotic growth in these N-limited ecosystems. © 2019 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158977
Appears in Collections: 气候变化与战略
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作者单位: Department of Biology, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182-4614, United States; Ecosystem Center/Bay Paul Center, Marine Biological Laboratory, Woods HoleMA 02543, United States; Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada; Department of Plant Sciences, University of California Davis, One Shields Ave. DavisCA 95616, United States; Ecology, Behavior & Evolution Section, University of California San Diego, 9500 Gilman Dr. #0116, La Jolla, CA 92093-0116, United States
Recommended Citation:
Pérez Castro S.,Esch E.H.,Eviner V.T.,et al. Exotic herbaceous species interact with severe drought to alter soil N cycling in a semi-arid shrubland[J]. Geoderma,2020-01-01,361