globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12068
论文题名:
Climate warming and precipitation redistribution modify tree-grass interactions and tree species establishment in a warm-temperate savanna
作者: Volder A.; Briske D.D.; Tjoelker M.G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期:3
起始页码: 843
结束页码: 857
语种: 英语
英文关键词: Climate change ; Competition ; Plant growth ; Precipitation patterns ; Savanna ; Tree-grass dynamics
Scopus关键词: rain ; aboveground biomass ; canopy ; climate change ; environmental factor ; environmental stress ; evergreen tree ; global warming ; growth rate ; growth response ; precipitation (climatology) ; rainfall ; savanna ; survival ; article ; biodiversity ; greenhouse effect ; physiology ; Poaceae ; tree ; Biodiversity ; Global Warming ; Poaceae ; Rain ; Trees ; United States ; Juniperus ; Juniperus virginiana ; Quercus stellata ; Schizachyrium scoparium
英文摘要: Savanna tree-grass interactions may be particularly sensitive to climate change. Establishment of two tree canopy dominants, post oak (Quercus stellata) and eastern redcedar (Juniperus virginiana), grown with the dominant C4 perennial grass (Schizachyrium scoparium) in southern oak savanna of the United States were evaluated under four climatic scenarios for 6 years. Tree-grass interactions were examined with and without warming (+1.5 °C) in combination with a long-term mean rainfall treatment and a modified rainfall regime that redistributed 40% of summer rainfall to spring and fall, intensifying summer drought. The aim was to determine: (1) the relative growth response of these species, (2) potential shifts in the balance of tree-grass interactions, and (3) the trajectory of juniper encroachment into savannas, under these anticipated climatic conditions. Precipitation redistribution reduced relative growth rate (RGR) of trees grown with grass. Warming increased growth of J. virginiana and strongly reduced Q. stellata survival. Tiller numbers of S. scoparium plants were unaffected by warming, but the number of reproductive tillers was increasingly suppressed by intensified drought each year. Growth rates of J. virginiana and Q. stellata were suppressed by grass presence early, but in subsequent years were higher when grown with grass. Quercus stellata had overall reduced RGR, but enhanced survival when grown with grass, while survival of J. virginiana remained near 100% in all treatments. Once trees surpassed a threshold height of 1.1 m, both tiller number and survival of S. scoparium plants were drastically reduced by the presence of J. virginiana, but not Q. stellata. Juniperus virginiana was the only savanna dominant in which neither survival nor final aboveground mass were adversely affected by the climate scenario of warming and intensified summer drought. These responses indicate that climate warming and altered precipitation patterns will further accelerate juniper encroachment and woody thickening in a warm-temperate oak savanna. © 2012 Blackwell Publishing Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62499
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Horticultural Sciences, TAMU 2133, Texas AandM University, College Station TX, United States; Department of Ecosystem Science and Management, TAMU 2138, Texas AandM University, College Station, TX, United States; Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia

Recommended Citation:
Volder A.,Briske D.D.,Tjoelker M.G.. Climate warming and precipitation redistribution modify tree-grass interactions and tree species establishment in a warm-temperate savanna[J]. Global Change Biology,2013-01-01,19(3)
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