| Soil moisture and temperature for plateau plastic mulching cultivation in drylands of Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2016.06.06 |
| Key Words: plastic film mulching soil moisture soil temperature rainfall Loess Plateau |
| Author Name | Affiliation | | ZHU Wei | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | LI Xiao | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | LI Hui-jie | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | LI Ming | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | JIANG Rui | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China |
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| Abstract: |
| Water deficit is the key restrictive factor for grain production in the rainfed agricultural region of Loess Plateau. The experiment was performed in Changwu tableland. The paper aims to analyze the changes of soil water content and temperature under plastic film mulching and the dynamic impact of rainfall events on soil water by comparison between ridge plastic film mulching cultivation (RP) and flat cultivation without plastic film mulching (FP) treatments. The results showed that the soil moisture in 30～60 cm soil layer significantly increased by approximate 8% between FP and RP treatments; Soil water storage in FP treatment in deep soil layer (100～160 cm) was significantly higher than that in RP treatment. Soil water storage of 30～60 cm in RP treatment and furrow were both higher about 20 mm than that in FP treatment throughout growth season, but the soil water in 100～160 cm in RP treatment was lower 25 mm than soil water in FP treatment. Soil temperature above 10 cm soil surface in RP-Ridge(RPR) was 2.01℃ and 1.91℃ higher than RP-Furrow(RPF) and FP treatment, respectively. The deeper rainfall infiltration appeared in RP treatment when middle rainfall events occurred; the deep infiltration was limited in RP treatment when storm events occurred. The peak value of soil water content after rainfall was depended on the amount of rainfall and the antecedent soil moisture before rainfall. The peak time appeared earlier in RP treatment than that in FP treatment, due to the improved soil moisture conditions under plastic film mulching. RPF could well-catch the rain water from ridge and the water in furrow could supply the ridge by lateral movement with a certain delay. RP can enhance soil water content and soil temperature. It also could increase infiltration of rainfall, but limit the deep infiltration if storm events occurred, and avoid the “self-mulching” phenomenon. Therefore RP had positive effects on maize growth. |
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