Arid
DOI10.1111/gcb.12856
The role of vegetation-microclimate feedback in promoting shrub encroachment in the northern Chihuahuan desert
He, Yufei; D’Odorico, Paolo; De Wekker, Stephan F. J.
通讯作者He, Yufei
来源期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
出版年2015
卷号21期号:6页码:2141-2154
英文摘要

Many arid and semi-arid landscapes around the world are affected by a shift from grassland to shrubland vegetation, presumably induced by climate warming, increasing atmospheric CO2 concentrations, and/or changing land use. This major change in vegetation cover is likely sustained by positive feedbacks with the physical environment. Recent research has focused on a feedback with microclimate, whereby cold intolerant shrubs increase the minimum nocturnal temperatures in their surroundings. Despite the rich literature on the impact of land cover change on local climate conditions, changes in microclimate resulting from shrub expansion into desert grasslands have remained poorly investigated. It is unclear to what extent such a feedback can affect the maximum extent of shrub expansion and the configuration of a stable encroachment front. Here, we focus on the case of the northern Chihuahuan desert, where creosotebush (Larrea tridentata) has been replacing grasslands over the past 100-150years. We use a process-based coupled atmosphere-vegetation model to investigate the role of this feedback in sustaining shrub encroachment in the region. Simulations indicate that the feedback allows juvenile shrubs to establish in the grassland during average years and, once established, reduce their vulnerability to freeze-induced mortality by creating a warmer microclimate. Such a feedback is crucial in extreme cold winters as it may reduce shrub mortality. We identify the existence of a critical zone in the surroundings of the encroachment front, in which vegetation dynamics are bistable: in this zone, vegetation can be stable both as grassland and as shrubland. The existence of these alternative stable states explains why in most cases the shift from grass to shrub cover is found to be abrupt and often difficult to revert.


英文关键词cold stress Larrea tridentata mesoscale modeling minimum temperature shrub encroachment vegetation-microclimate feedback weather research and forecasting model
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000353977500004
WOS关键词INDUCED XYLEM CAVITATION ; LARREA-TRIDENTATA ; CLIMATE-CHANGE ; CONVECTIVE PARAMETERIZATION ; CARBON-DIOXIDE ; NEW-MEXICO ; WRF MODEL ; PART I ; ECOSYSTEM ; DYNAMICS
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/187591
作者单位Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA
推荐引用方式
GB/T 7714
He, Yufei,D’Odorico, Paolo,De Wekker, Stephan F. J.. The role of vegetation-microclimate feedback in promoting shrub encroachment in the northern Chihuahuan desert[J],2015,21(6):2141-2154.
APA He, Yufei,D’Odorico, Paolo,&De Wekker, Stephan F. J..(2015).The role of vegetation-microclimate feedback in promoting shrub encroachment in the northern Chihuahuan desert.GLOBAL CHANGE BIOLOGY,21(6),2141-2154.
MLA He, Yufei,et al."The role of vegetation-microclimate feedback in promoting shrub encroachment in the northern Chihuahuan desert".GLOBAL CHANGE BIOLOGY 21.6(2015):2141-2154.
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