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在广西山区选择沙土、壤土和黏土等3种典型土壤,并开展滴灌在这3种土壤条件下的土壤水分运移规律研究。试验结果表明:1在地埋黏土、壤土和沙土以及0.10 MPa工作压力条件下,滴灌管的单米流量为4.17、5.92和6.10 L/h,为地表自由出流的67.58%、95.05%和98.87%;2滴灌在黏土的水分运移形状基本为圆形,在沙土和壤土的湿润形状为上小下大的椭圆形;3同等条件下,水分在沙土的水平和垂直向下运移速率最大,壤土次之,黏土最小;4在土箱相同位置,黏土的土壤含水率最大,壤土次之,沙土最小;5根据滴灌的土壤水分运移规律,提出滴灌管在广西山区沙土、壤土和黏土的适宜埋深分别为10、15和20 cm;6滴灌应用在山区条播作物时,在黏土、壤土、沙土的适宜滴孔间距应为35、30和25 cm。
Three kinds of typical soils, such as sand, loam and clay, were selected in mountainous areas of Guangxi. Soil water transport under drip irrigation was studied under these three soil conditions. The results show that: 1, under the conditions of buried clay, loamy soil and sandy soil and 0.10 MPa working pressure, the single-meter flow of drip irrigation pipe is 4.17, 5.92 and 6.10 L / h respectively, which is 67.58%, 95.05% and 98.87 %. The shape of water transport in the two drip irrigation is basically round, and the wet shape of sand and loam is elliptical with small upper and lower. Under the same conditions, the maximum and vertical downward movement rate of water in sand is the largest , Followed by loam and soil, with the smallest clay. 4 In the same position of soil box, clay soil has the highest soil moisture content, followed by loam soil, and the least sand soil. 5 According to the law of soil moisture transport by drip irrigation, The optimum depth of drip irrigation for the application of 6-drip irrigation in the mountainous area is 35, 30 and 25 cm for clay, loam and sand.