Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.soilbio.2008.05.008 |
Revisiting classic water erosion models in drylands: The strong impact of biological soil crusts | |
Bowker, Matthew A.1; Belnap, Jayne1![]() | |
通讯作者 | Bowker, Matthew A. |
来源期刊 | SOIL BIOLOGY & BIOCHEMISTRY
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ISSN | 0038-0717 |
出版年 | 2008 |
卷号 | 40期号:9页码:2309-2316 |
英文摘要 | Soil erosion and subsequent degradation has been a contributor to societal collapse in the past and is one of the major expressions of desertification in and regions. The revised universal soil loss equation (RUSLE) models soil lost to water erosion as a function of climate erosivity (the degree to which rainfall can result in erosion), topography, soil erodibility, and land use/management. The soil erodibility factor (K) is primarily based upon inherent soil properties (those which change slowly or not at all) such as soil texture and organic matter content, while the cover/management factor (C) is based on several parameters including biological soil crust (BSC) cover. We examined the effect of two more precise indicators of BSC development, chlorophyll a and exopolysaccharides (EPS), upon soil stability, which is closely inversely related to soil loss in an erosion event. To examine the relative influence of these elements of the C factor to the K factor, we conducted our investigation across eight strongly differing soils in the 0.8 million ha Grand Staircase-Escalante National Monument. We found that within every soil group, chlorophyll a was a moderate to excellent predictor of soil stability (R-2=0.21-0.75), and consistently better than EPS. Using a simple structural equation model, we explained over half of the variance in soil stability and determined that the direct effect of chlorophyll a was 3x more important than soil group in determining soil stability. Our results suggest that, holding the intensity of erosive forces constant, the acceleration or reduction of soil erosion in and landscapes will primarily be an outcome of management practices. This is because the factor which is most influential to soil erosion, BSC development, is also among the most manageable, implying that water erosion in drylands has a solution. (C) 2008 Elsevier Ltd. All rights reserved. |
英文关键词 | arid and semi-arid regions cryptobiotic soil crusts cryptogams cyanobacteria erosion modeling universal soil loss equation |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000259341500032 |
WOS关键词 | AGGREGATE STABILITY ; WIND EROSION ; ORGANIC-MATTER ; ERODIBILITY ; STABILIZATION ; ENVIRONMENTS ; RUNOFF ; AREAS ; INDEX |
WOS类目 | Soil Science |
WOS研究方向 | Agriculture |
来源机构 | United States Geological Survey |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/159210 |
作者单位 | 1.US Geol Survey, Moab, UT 84532 USA; 2.No Arizona Univ, Dept Biol Sci, Flagstaff, AZ 86011 USA; 3.No Arizona Univ, Ctr Environm Sci & Educ, Flagstaff, AZ 86011 USA |
推荐引用方式 GB/T 7714 | Bowker, Matthew A.,Belnap, Jayne,Chaudhary, V. Bala,et al. Revisiting classic water erosion models in drylands: The strong impact of biological soil crusts[J]. United States Geological Survey,2008,40(9):2309-2316. |
APA | Bowker, Matthew A.,Belnap, Jayne,Chaudhary, V. Bala,&Johnson, Nancy C..(2008).Revisiting classic water erosion models in drylands: The strong impact of biological soil crusts.SOIL BIOLOGY & BIOCHEMISTRY,40(9),2309-2316. |
MLA | Bowker, Matthew A.,et al."Revisiting classic water erosion models in drylands: The strong impact of biological soil crusts".SOIL BIOLOGY & BIOCHEMISTRY 40.9(2008):2309-2316. |
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