Arid
DOI10.1890/ES10-00073.1
Positive feedback between microclimate and shrub encroachment in the northern Chihuahuan desert
D’Odorico, Paolo1; Fuentes, Jose D.2; Pockman, William T.3; Collins, Scott L.3; He, Yufei1; Medeiros, Juliana S.4; Dewekker, Stephan1; Litvak, Marcy E.3
通讯作者D’Odorico, Paolo
来源期刊ECOSPHERE
ISSN2150-8925
出版年2010
卷号1期号:6
英文摘要

Woody plant encroachment is affecting vegetation composition in arid grasslands worldwide and has been associated with a number of environmental drivers and feedbacks. It has been argued that the relatively abrupt character (both in space and in time) of grassland-to-shrubland transitions observed in many drylands around the world might result from positive feedbacks in the underlying ecosystem dynamics. In the case of the Chihuahuan Desert, we show that one such feedback could emerge from interactions between vegetation and microclimate conditions. Shrub establishment modifies surface energy fluxes, causing an increase in nighttime air temperature, particularly during wintertime. The resulting change in winter air temperature regime is important because the northern limit of the dominant shrub in the northern Chihuahuan Desert, Larrea tridentata, presently occurs where minimum temperatures are sufficiently low to be a potential source of mortality. Using freezing responses from published studies in combination with observed temperature records, we predict that a small warming can yield meaningful changes in plant function and survival. Moreover, we also suggest that the effect of the change in air temperature on vegetation depends on whether plants experience drought during winter. Thus, in the Chihuahuan region a positive feedback exists between shrub encroachment and changes in microclimate conditions, with implications for the response of this ecosystem to regional changes in temperature and precipitation.


英文关键词Chihuahuan Desert feedbacks microclimate shrub encroachment state shift warming
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000208810200004
WOS关键词INDUCED XYLEM CAVITATION ; SPATIAL-PATTERNS ; ECOSYSTEM ; FIRE ; MANAGEMENT ; GRASSLANDS ; DYNAMICS ; RANGE
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/163940
作者单位1.Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA;
2.Penn State Univ, Dept Meteorol, University Pk, PA 16802 USA;
3.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA;
4.Univ Kansas, Dept Ecol & Evolutionary Biol, Lawrence, KS 66045 USA
推荐引用方式
GB/T 7714
D’Odorico, Paolo,Fuentes, Jose D.,Pockman, William T.,et al. Positive feedback between microclimate and shrub encroachment in the northern Chihuahuan desert[J],2010,1(6).
APA D’Odorico, Paolo.,Fuentes, Jose D..,Pockman, William T..,Collins, Scott L..,He, Yufei.,...&Litvak, Marcy E..(2010).Positive feedback between microclimate and shrub encroachment in the northern Chihuahuan desert.ECOSPHERE,1(6).
MLA D’Odorico, Paolo,et al."Positive feedback between microclimate and shrub encroachment in the northern Chihuahuan desert".ECOSPHERE 1.6(2010).
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