Arid
DOI10.1080/15324980390169109
The effects of microbiotic soil crusts on soil water loss
George, DB; Roundy, BA; St Clair, LL; Johansen, JR; Schaalje, GB; Webb, BL
通讯作者George, DB
来源期刊ARID LAND RESEARCH AND MANAGEMENT
ISSN1532-4982
出版年2003
卷号17期号:2页码:113-125
英文摘要

Microbiotic soil crusts play several important roles in many arid and semiarid ecosystems around the world. Their effects on soil hydrology, however, are poorly understood. It has been speculated that crusts ( 1) improve soil water availability by sealing the soil surface to water loss, or ( 2) diminish soil water by increasing the latent heat of a soil pro le thereby increasing evaporation. In order to distinguish between these two opposing hypotheses, we analyzed water loss and temperature of soil profiles covered by different types of microbiotic soil crust ( cyanobacteria, Psora decipiens, Placidium squamulosum) and a bare soil. We conducted experiments under growth chamber and field conditions. After watering to field capacity, surfaces (1-3 cm deep) of crusted soils took as long or longer to decrease to -1.5 MPa water potential as bare soil in both the growth chamber and the field. In the growth chamber, soils covered by each of the crust types took longer to dry than bare soil. In the field, soils covered by cyanobacteria took longer to dry than bare soils or those covered by the other crusts. Daily soil temperature was not different among the different crust types and bare soil in either experiment. This study did not support the hypothesis that crusts dry a soil pro le more quickly by increasing the amount of energy available for evaporation. Rather our data suggested that crusts increase soil water availability by increasing water flux resistance, specifically at the soil surface.


英文关键词available soil water biological soil crust crust thermodynamics cyanobacterial crust cryptobiotic crust cryptogamic crust hydrology lichen-dominated crust microbiotic crust
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000180967100002
WOS关键词CRYPTOGAMIC CRUSTS ; COLORADO PLATEAU ; INFILTRATION ; AUSTRALIA ; RAINFALL ; COVER ; UTAH ; AREA
WOS类目Environmental Sciences ; Soil Science
WOS研究方向Environmental Sciences & Ecology ; Agriculture
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/144130
作者单位(1)Brigham Young Univ, Dept Bot & Range Sci, Provo, UT 84602 USA;(2)John Carroll Univ, Dept Biol, Cleveland, OH 44118 USA;(3)Brigham Young Univ, Dept Stat, Provo, UT 84602 USA;(4)Brigham Young Univ, Dept Agron & Hort, Provo, UT 84602 USA
推荐引用方式
GB/T 7714
George, DB,Roundy, BA,St Clair, LL,et al. The effects of microbiotic soil crusts on soil water loss[J],2003,17(2):113-125.
APA George, DB,Roundy, BA,St Clair, LL,Johansen, JR,Schaalje, GB,&Webb, BL.(2003).The effects of microbiotic soil crusts on soil water loss.ARID LAND RESEARCH AND MANAGEMENT,17(2),113-125.
MLA George, DB,et al."The effects of microbiotic soil crusts on soil water loss".ARID LAND RESEARCH AND MANAGEMENT 17.2(2003):113-125.
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