Arid
DOI10.1029/2009JD013529
On the impact of shrub encroachment on microclimate conditions in the northern Chihuahuan desert
He, Yufei1; D’Odorico, Paolo1; De Wekker, Stephan F. J.1; Fuentes, Jose D.2; Litvak, Marcy3
通讯作者He, Yufei
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2010
卷号115
英文摘要

Changes in vegetation cover are known for their ability to modify the surface energy balance and near-surface microclimate conditions. A major change in vegetation composition that has been occurring in many dryland regions around the world is associated with the replacement of arid grasslands by desert shrublands. The impact of shrub encroachment on regional climate conditions remains poorly investigated, and, to date, it is unclear how this shift in plant community composition may affect the microclimate. Here we used concurrent meteorological observations at two adjacent sites dominated by Larrea tridentata shrubs and native grass species, respectively, in the northern Chihuahuan desert to investigate differences in nighttime air temperatures between the shrubland and grassland vegetation covers. The nighttime air temperature was found to be substantially higher (>2 degrees C) in the shrubland than in the grassland, especially during calm winter nights. These differences in surface air temperature were accompanied by differences in longwave radiation and sensible and ground heat fluxes. We developed a one-dimensional model to show how longwave radiation emitted by the ground at night can explain the higher nighttime air temperature over the shrubland. Because of the larger fraction of bare soil typically existing in the shrub cover, the ground surface remains less insulated and more energy flows into the ground at the shrubland site than in the grassland during daytime. This energy is then released at night mainly as longwave radiation, which causes the differences in the nighttime air temperatures between the two land covers.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000284220200001
WOS关键词WOODY-PLANT ENCROACHMENT ; LAND-USE ; AMERICAN GRASSLANDS ; CARBON-DIOXIDE ; SONORAN DESERT ; UNITED-STATES ; CLIMATE ; VEGETATION ; DESERTIFICATION ; ATMOSPHERE
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/165238
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 87106 USA
推荐引用方式
GB/T 7714
He, Yufei,D’Odorico, Paolo,De Wekker, Stephan F. J.,et al. On the impact of shrub encroachment on microclimate conditions in the northern Chihuahuan desert[J],2010,115.
APA He, Yufei,D’Odorico, Paolo,De Wekker, Stephan F. J.,Fuentes, Jose D.,&Litvak, Marcy.(2010).On the impact of shrub encroachment on microclimate conditions in the northern Chihuahuan desert.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,115.
MLA He, Yufei,et al."On the impact of shrub encroachment on microclimate conditions in the northern Chihuahuan desert".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 115(2010).
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