干旱区生态环境知识资源中心(Arid): Microlysimeters overestimate the amount of non-rainfall water

Arid

DOI	10.1016/j.catena.2020.104691
	Microlysimeters overestimate the amount of non-rainfall water - an experimental approach
	Kidron, Giora J.; Kronenfeld, Rafael
通讯作者	Kidron, GJ
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2020
卷号	194
英文摘要	The notion that non-rainfall water (NRW) serves as an important water source for desert cyanobacterial biocrusts is wide-spread, although some publications reported very low values, substantially lower than the threshold required for cyanobacterial activity (0.1 mm). Recent publications highlighted however the possibility that microlysimeters (MLs), which are mainly used to measure NRW, may overestimate the amount of dew that is commonly formed at the upper 0.2 cm of the soil. These sources claim that the dew point temperature (Td) may be reached much sooner at the ML (which will result in higher NRW) in comparison to the intact soil (COT) due to heat loss through ML walls. In order to examine this possibility, a set of experiments were conducted in the Negev Desert, using small MLs. In comparison to COT, the findings indicate that (a) significantly lower nighttime temperature (averaging 2.1 degrees C) characterized the ML, (b) even during days with very low NRW, relatively high amounts of 0.2-0.3 mm were recorded by the ML, (c) the 0-0.2 cm soil samples collected from the ML yielded significantly higher values than COT, and similarly, cloths attached to the surface of the ML yielded significantly higher amounts (2.05-fold higher) than those attached to COT, and (d) longer MLs or MLs filled with fine-grained soil (loess) yield higher amounts than short MLs or MLs filled with sand, respectively. The findings indicate that the amounts of NRW recorded by the MLs overestimate the amount of NRW recorded by COT, and that the amounts recorded by the ML depend upon its length and parent material. The findings may explain contradictory results published in the literature, and the wide-spread but apparently erroneous assumption that dew may serve as an important water source for cyanobacterial biocrusts.
英文关键词	Cyanobacteria Dew Lichens Loess Vapor Negev Desert
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000566699000027
WOS关键词	SAND MICROBIOTIC CRUSTS ; BIOLOGICAL SOIL CRUSTS ; NEGEV-DESERT ; BARE SOIL ; EVAPORATION MEASUREMENTS ; TORTULA-RURALIS ; DEW DEPOSITION ; HEAT-FLUX ; LICHENS ; MOSS
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
来源机构	Hebrew University of Jerusalem
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326079
作者单位	[Kidron, Giora J.] Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel; [Kronenfeld, Rafael] Israel Meteorol Serv, Meteorol Unit, IL-84993 Kibbutz Sede Boqer, Israel
推荐引用方式 GB/T 7714	Kidron, Giora J.,Kronenfeld, Rafael. Microlysimeters overestimate the amount of non-rainfall water - an experimental approach[J]. Hebrew University of Jerusalem,2020,194.
APA	Kidron, Giora J.,&Kronenfeld, Rafael.(2020).Microlysimeters overestimate the amount of non-rainfall water - an experimental approach.CATENA,194.
MLA	Kidron, Giora J.,et al."Microlysimeters overestimate the amount of non-rainfall water - an experimental approach".CATENA 194(2020).