| Evaporation from soil with plant additive under perforated plastic mulch conditions |
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| DOI：10.7606/j.issn.1000-7601.2016.01.01 |
| Key Words: plant additive filmed hole diameter soil water diffusivity soil-water characteristic curve accumulative evaporation |
| Author Name | Affiliation | | ZHENG Jian | China Western Research Center of Energy & Environment, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
College of Energy & Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | WANG Yan | College of Energy & Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | WANG Xiao-yu | China Western Research Center of Energy & Environment, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
College of Energy & Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | REN Qian-hui | China Western Research Center of Energy & Environment, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
College of Energy & Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | LI Zhi-jun | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To explore characteristics of evaporation from soil with plant additive under perforated plastic mulch conditions, this paper carried out research on soil water diffusivity, soil-water characteristic curve and soil accumulative evaporation of soil with 1% plant additive under different conditions. The treatments included different plant additives, soil bulk density and perforated diameters. Two plant additives including maize cobs and maize leaves with a soil bulk density of 1.35 g·cm-3 and 1.40 g·cm-3 were considered. Meanwhile, three hole diameters on the plastic mulches were also investigated in this study. The results showed that soil water diffusivity in soil followed the following law: 1% maize cob additive＞pure soil＞soil with 1% maize leaf additive. For both treatments by pure soil and soil with the same plant additive, the soil water diffusivity with 1.35 g·cm-3 soil bulk density were higher than that with 1.40 g·cm-3 density. During low suction stage, soil water content was decreased rapidly, and the soil-water characteristic curve showed a steep trend. With the increase of soil water suction, soil-water characteristic curve was slowing down gradually. Under the same soil water suction condition, soil water content with all treatments containing plant additive was higher than that with pure soil. The accumulative evaporation in different soil bulk densities displayed the following trend: soil with 1% maize cob additive＞1% maize leaf additive＞pure soil, and it also presented the following trend in different hole diameters on the plastic mulches as 6 cm＞4 cm＞2 cm. In all treatments, soil accumulative evaporation in 1.40 g·cm-3 soil bulk density was higher than that in 1.35 g·cm-3. |
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