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Open AccessArticle

Effect of Straw Mulch on Soil Evaporation during Freeze–Thaw Periods

1
College of Water Resources and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
First Hydrogeology and Engineering Geology Team of Shanxi Province, Taiyuan 030024, China
3
Taigu Water Balance Experimental Field, Bureau of Hydrology and Water Resources Survey of Shanxi Province, Taigu 030800, China
4
Department of Earth Sciences, University of the Western Cape, Private Bag X17, Bellville, Cape Town 7535, South Africa
*
Author to whom correspondence should be addressed.
Water 2019, 11(8), 1689; https://doi.org/10.3390/w11081689
Received: 17 July 2019 / Revised: 8 August 2019 / Accepted: 12 August 2019 / Published: 15 August 2019
(This article belongs to the Section Water Resources Management and Governance)
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Abstract

Reducing soil evaporation is important to alleviate water shortages in arid and semi-arid regions. The objective of this work was to reveal the effect of straw mulch on soil evaporation based on field experiments during a freeze–thaw period in Northern China. Four soil surface mulch treatment modes were investigated: Bare soil (BS), 1 cm thick straw mulch with 100% coverage rate (J1), 2 cm thick straw mulch with 100% coverage rate (J2), and 2 cm thick straw mulch with 50% coverage rate (J3). Principal component analysis was used to analyze the major factors influencing soil evaporation in three freeze–thaw stages. The results show that cumulative soil evaporation decreased with increased straw mulch thickness and coverage rate. The effect of straw mulching on soil evaporation was obvious during the stable freezing period, and soil evaporation with straw mulch treatments was reduced by 49.0% to 58.8% compared to BS treatment, while there was little difference for straw mulch treatments in the thawing stage. The relationship between cumulative soil evaporation under different straw mulch modes and time was well fitted by the power function. In the unstable freezing stage, the major factors for all treatments influencing soil evaporation were surface soil temperature and water surface evaporation; in the stable stage, they were solar radiation and relative humidity, and in the thawing stage, they were solar radiation and air temperature. The research results can provide a basis for addressing soil water storage and moisture conservation and restraining ineffective soil evaporation in arid and semi-arid areas. View Full-Text
Keywords: freeze-thaw period; soil evaporation; straw mulch; principal component analysis freeze-thaw period; soil evaporation; straw mulch; principal component analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chen, J.; Xie, X.; Zheng, X.; Xue, J.; Miao, C.; Du, Q.; Xu, Y. Effect of Straw Mulch on Soil Evaporation during Freeze–Thaw Periods. Water 2019, 11, 1689.

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