Influence of gravel mulch stratum thickness and gravel grain size on evaporation resistance (SCI)

CORC > 寒区旱区环境与工程研究所 > 中科院寒区旱区环境与工程研究所（未分类） > 期刊论文

	Influence of gravel mulch stratum thickness and gravel grain size on evaporation resistance (SCI)
	Qiu Y. ; Xie Z. K. ; Wang Y. J. ; Ren J. L. ; Malhi S. S.
刊名	Journal of Hydrology
	2014
卷号	519 期号:1908-1913
英文摘要	In the Loess Plateau of northwestern China, a system for dry farming has evolved based on the employ of gravel mulch. A couple of lab experiments were conducted to study the influences of mulch stratum thickness and gravel grain size on water vapor flow, with a focus on resistance to evaporation in gravel mulch stratum. In Experiment 1, six treatments included mulching with gravel of different thickness (2 cm, 4 cm, 6 cm, 8 cm and 10 cm) plus no mulching (control) were studied. In Experiment 2, the 10 cm thick mulch layer consisted of different grain size gravel [2-5 (A), 5-20 (B), 20-40 (C), 40-60 (D) and 60-80 (E) mm], plus three mixture treatments. Compared to bare soil, mulched soils had significantly lower accumulated evaporation, and gravel mulch significantly increased resistance to evaporation. The aerodynamic resistance to evaporation in bare soil is higher than that in mulched treatments and the relationship between equivalent grain size and aerodynamic resistance in mulched surface can be described by a line function. The relationships between mulch resistance and mulch stratum thickness or grain size of gravel, were represented by logistic curves. The findings showed that equivalent grain size and specific surface area of gravel were sensitive indicators of mulch resistance. Based on the results of laboratory experiments, we put forward a new calculated model of mulch resistance, but further research is needed for verification and exact parameterization of this model under field conditions. (C) 2014 Elsevier B.V. All rights reserved.
收录类别	SCI
公开日期	2015-12-24
内容类型	期刊论文
源URL	[http://ir.casnw.net/handle/362004/24893]
专题	寒区旱区环境与工程研究所_中科院寒区旱区环境与工程研究所（未分类）_期刊论文
推荐引用方式 GB/T 7714	Qiu Y.,Xie Z. K.,Wang Y. J.,et al. Influence of gravel mulch stratum thickness and gravel grain size on evaporation resistance (SCI)[J]. Journal of Hydrology,2014,519(1908-1913).
APA	Qiu Y.,Xie Z. K.,Wang Y. J.,Ren J. L.,&Malhi S. S..(2014).Influence of gravel mulch stratum thickness and gravel grain size on evaporation resistance (SCI).Journal of Hydrology,519(1908-1913).
MLA	Qiu Y.,et al."Influence of gravel mulch stratum thickness and gravel grain size on evaporation resistance (SCI)".Journal of Hydrology 519.1908-1913(2014).