Arid
DOI10.1016/j.ppees.2012.03.002
Windows of opportunity for Prosopis velutina seedling establishment and encroachment in a semiarid grassland
de Dios, Victor Resco1,2; Weltzin, Jake F.3; Sun, Wei1,4; Huxman, Travis E.5,6; Williams, David G.1,7,8
通讯作者de Dios, Victor Resco
来源期刊PERSPECTIVES IN PLANT ECOLOGY EVOLUTION AND SYSTEMATICS
ISSN1433-8319
出版年2012
卷号14期号:4页码:275-282
英文摘要

Large increases in the density of woody plants in former grasslands have been documented globally over the past two centuries. Prosopis velutina (velvet mesquite) has recently expanded on over 38 million ha in the grasslands of the American southwest.


Mesquite establishment and expansion is potentially influenced by competitive interactions with grasses, particle size distribution (texture) of soil and changes in the amount and/or seasonality of precipitation, amongst other factors.


To investigate the relative importance of precipitation seasonality, grass competition, and soil texture on mesquite seedling and establishment, we experimentally manipulated seasonality of precipitation across 72 1.5 m x 1.7 m plots that we planted with two grasses from contrasting functional groups (or left unvegetated) across two highly contrasting soil textures within a semi-desert grassland in Arizona, USA, wherein we followed the demography of 8640 planted mesquite seeds between 2002 and 2006. Up to 70% of the variance in seedling emergence was explained by soil water content, and seedling mortality was more dependent on summer than on winter precipitation.


Mortality of less drought tolerant grasses after drought in coarse textured soils created conditions most favorable for seedling establishment, whereas lower rates of seedling establishment were observed in finer textured soils or in plots dominated by more drought tolerant grasses.


We conclude that mesquite encroachment is episodic, based on discontinuous patterns of seedling establishment, favored on coarse textured soils and associated with unique conditions of high summer water availability when precipitation is not limiting and when competition from grasses is lowered. (c) 2012 Elsevier GmbH. All rights reserved.


英文关键词Experimental water manipulation Plant-plant interactions Precipitation seasonality Savannah Soil texture Woody plant encroachment
类型Article
语种英语
国家USA ; Australia ; Peoples R China
收录类别SCI-E
WOS记录号WOS:000308520500004
WOS关键词LEAF GAS-EXCHANGE ; PRECIPITATION PULSES ; WOODY LEGUME ; SOIL TEXTURE ; VEGETATION ; WATER ; TERRESTRIAL ; ECOSYSTEMS ; SAVANNA ; CLIMATE
WOS类目Plant Sciences ; Ecology
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology
来源机构University of Arizona
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174357
作者单位1.Univ Wyoming, Dept Ecosyst Sci & Management, Laramie, WY 82071 USA;
2.Univ Western Sydney, Hawkesbury Inst Environm, Richmond, NSW 2753, Australia;
3.Univ Tennessee, Dept Ecol & Evolutionary Biol, Knoxville, TN 37996 USA;
4.NE Normal Univ, Key Lab Vegetat Ecol, Minist Educ, Inst Grassland Sci, Changchun 130024, Jilin, Peoples R China;
5.Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ 85721 USA;
6.Univ Arizona, Earthsci B2, Tucson, AZ 85721 USA;
7.Univ Wyoming, Dept Bot, Laramie, WY 82071 USA;
8.Univ Wyoming, Program Ecol, Laramie, WY 82071 USA
推荐引用方式
GB/T 7714
de Dios, Victor Resco,Weltzin, Jake F.,Sun, Wei,et al. Windows of opportunity for Prosopis velutina seedling establishment and encroachment in a semiarid grassland[J]. University of Arizona,2012,14(4):275-282.
APA de Dios, Victor Resco,Weltzin, Jake F.,Sun, Wei,Huxman, Travis E.,&Williams, David G..(2012).Windows of opportunity for Prosopis velutina seedling establishment and encroachment in a semiarid grassland.PERSPECTIVES IN PLANT ECOLOGY EVOLUTION AND SYSTEMATICS,14(4),275-282.
MLA de Dios, Victor Resco,et al."Windows of opportunity for Prosopis velutina seedling establishment and encroachment in a semiarid grassland".PERSPECTIVES IN PLANT ECOLOGY EVOLUTION AND SYSTEMATICS 14.4(2012):275-282.
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