Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1080/15324980390169109 |
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
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ISSN | 1532-4982 |
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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