DOI: 10.1111/gcb.12301
论文题名: Selective grazing modifies previously anticipated responses of plant community composition to elevated CO2 in a temperate grassland
作者: Newton P.C.D. ; Lieffering M. ; Parsons A.J. ; Brock S.C. ; Theobald P.W. ; Hunt C.L. ; Luo D. ; Hovenden M.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 1 起始页码: 158
结束页码: 169
语种: 英语
英文关键词: Botanical composition
; Climate change
; Forbs
; Legumes
Scopus关键词: carbon dioxide
; climate change
; climate effect
; community composition
; defoliation
; ecosystem service
; grassland
; grazing
; growth rate
; legume
; plant community
; terrestrial ecosystem
; Animalia
; Ovis aries
; Poaceae
; carbon dioxide
; animal
; article
; botanical composition
; climate change
; ecosystem
; Fabaceae
; forbs
; growth, development and aging
; herbivory
; legume
; New Zealand
; physiology
; Poaceae
; sheep
; botanical composition
; climate change
; forbs
; legumes
; Animals
; Carbon Dioxide
; Ecosystem
; Fabaceae
; Herbivory
; New Zealand
; Poaceae
; Sheep
英文摘要: Our limited understanding of terrestrial ecosystem responses to elevated CO2 is a major constraint on predicting the impacts of climate change. A change in botanical composition has been identified as a key factor in the CO2 response with profound implications for ecosystem services such as plant production and soil carbon storage. In temperate grasslands, there is a strong consensus that elevated CO2 will result in a greater physiological stimulus to growth in legumes and to a lesser extent forbs, compared with C3 grasses, and the presumption this will lead in turn to a greater proportion of these functional groups in the plant community. However, this view is based on data mainly collected in experiments of three or less years in duration and not in experiments where defoliation has been by grazing animals. Grazing is, however, the most common management of grasslands and known in itself to influence botanical composition. In a long-term Free Air Carbon Dioxide Enrichment (FACE) experiment in a temperate grassland managed with grazing animals (sheep), we found the response to elevated CO2 in plant community composition in the first 5 years was consistent with the expectation of increased proportions of legumes and forbs. However, in the longer term, these differences diminished so that the proportions of grasses, legumes and forbs were the same under both ambient and elevated CO2. Analysis of vegetation before and after each grazing event showed there was a sustained disproportionately greater removal ('apparent selection') of legumes and forbs by the grazing animals. This bias in removal was greater under elevated CO2 than ambient CO2. This is consistent with sustained faster growth rates of legumes and forbs under elevated CO2 being countered by selective defoliation, and so leading to little difference in community composition. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62081
Appears in Collections: 影响、适应和脆弱性
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作者单位: AgResearch, Private Bag 11008, Palmerston North, New Zealand; Institute of Agriculture and Environment, Massey University, Private Bag 11222, Palmerston North, New Zealand; School of Plant Science, University of Tasmania, Locked Bag 55, Hobart, TAS 7001, Australia
Recommended Citation:
Newton P.C.D.,Lieffering M.,Parsons A.J.,et al. Selective grazing modifies previously anticipated responses of plant community composition to elevated CO2 in a temperate grassland[J]. Global Change Biology,2014-01-01,20(1)