Arid
DOI10.1016/j.geomorph.2016.12.015
Fire impact on soil-water repellency and functioning of semi-arid croplands and rangelands: Implications for prescribed burnings and wildfires
Stavi, Ilan1; Barkai, Daniel2; Knoll, Yaakov M.2; Abu Glion, Hiam2; Katra, Itzhak3; Brook, Anna4; Zaady, Eli2
通讯作者Stavi, Ilan
来源期刊GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
出版年2017
卷号280页码:67-75
英文摘要

An unintended fire outbreak during summer 2015 in the semi-arid Israeli Negev resulted in the burning of extensive croplands and rangelands. The rangelands have been managed over the long term for occasional grazing, while the croplands have been utilized for rainfed wheat cropping. Yet, during the studied year, the croplands were left fallow, allowing the growth of herbaceous vegetation, which was harvested and baled for hay before the fire outbreak. The study objectives were to investigate the impacts of fire, land-use, and soil depth on water-repellency and on the status and dynamics of some of the most important organic and mineral soil resources. Additionally, we aimed to assess the severity of this fire outbreak. The soil-water repellency was studied by measuring the soil’s water drop penetration time (WDPT) and critical surface tension (CST). A significant effect of fire on soil hydrophobicity was recorded, with a slight increase in mean WDPT and a slight decrease in mean CST in the burnt sites than in the non-burnt sites. Yet, soil hydrophobicity in the burnt lands was rather moderate and remained within the water repellency’s lowest class. A significant effect of land-use on the means of WDPT and CST was also recorded, being eleven-fold, greater and 7% smaller, respectively, in the rangelands than in the croplands. This is consistent with the almost eightfold greater mean above-ground biomass recorded in the non-burnt rangelands than in the non-burnt post-harvest croplands, revealing the positive relations between available fuel load and soil-water repellency. The effect of soil depth was significant for CST but not for WDPT. Overall, the gathered data suggest that fire severity was low to moderate. Fire was also found to significantly affect the <250 mu m particle size fraction of the unconsolidated material cover, its mass being twofold to threefold greater in the non-burnt than in the burnt sites. Yet, soil organic carbon and ammonium-N were also studied, and generally showed higher values for the burnt lands. Overall, this study shows that the low- to moderate-fire severity only slightly increased the soil water repellency, and at the same time, increased on-site availability of some important soil resources. Nevertheless, it is acknowledged that such fires could impose risks to off-site air and water source quality. This study has implications for the assessment of geo-ecosystem functioning, as well as for the status and dynamics of soil resources following prescribed burnings or wildfires. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词Environmental pollution Mixed farming systems Nutrient availability Soil quality
类型Article
语种英语
国家Israel
收录类别SCI-E
WOS记录号WOS:000393931400006
WOS关键词QUALITY ; MOISTURE ; NITROGEN ; FUSION ; CARBON
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构Ben-Gurion University of the Negev
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199261
作者单位1.Dead Sea & Arava Sci Ctr, IL-88820 Yotvata, Israel;
2.Agr Res Org, Gilat Res Ctr, Dept Nat Resources, IL-85280 Negev, Israel;
3.Ben Gurion Univ Negev, Dept Geog & Environm Dev, IL-84105 Beer Sheva, Israel;
4.Univ Haifa, Dept Geog & Environm Studies, IL-3498838 Haifa, Israel
推荐引用方式
GB/T 7714
Stavi, Ilan,Barkai, Daniel,Knoll, Yaakov M.,et al. Fire impact on soil-water repellency and functioning of semi-arid croplands and rangelands: Implications for prescribed burnings and wildfires[J]. Ben-Gurion University of the Negev,2017,280:67-75.
APA Stavi, Ilan.,Barkai, Daniel.,Knoll, Yaakov M..,Abu Glion, Hiam.,Katra, Itzhak.,...&Zaady, Eli.(2017).Fire impact on soil-water repellency and functioning of semi-arid croplands and rangelands: Implications for prescribed burnings and wildfires.GEOMORPHOLOGY,280,67-75.
MLA Stavi, Ilan,et al."Fire impact on soil-water repellency and functioning of semi-arid croplands and rangelands: Implications for prescribed burnings and wildfires".GEOMORPHOLOGY 280(2017):67-75.
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