膜下滴灌灌溉制度对土壤水盐空间分布及玉米产量的影响

灌溉制度对土壤水盐分布具有密切的关系,土壤水盐的分布又直接影响着作物产量。为了正确合理配置和利用水资源,改善试验区生态环境,减小肇州地区土壤含盐量对玉米产量造成的危害,选择肇州县水利科学试验站作为试验地点,试验结合膜下滴灌,设置4个水平的灌溉定额(200、300、400和500 m~3/hm~2),灌水次数分别为2次、3次和4次,测定并分析不同土层深度处土壤含水率、土壤可溶性盐浓度和玉米产量的变化。结果表明,灌溉定额为400 m~3/hm~2、灌水次数为4次时,玉米产量达到最大,且根系部位抑盐效果较好,是肇州地区较为经济合理的灌溉制度。

Influence of Drip Irrigation System under Film on Spatial Distribution of Soil Water and Salt and Maize Yield

The irrigation system has a close relationship with the distribution of soil water and salt, and the dis-tribution of soil water and salt directly affects crop yield. In order to correctly and rationally deploy and utilize water resources, improve ecological environment and reduce the harm of soil salinity to maize yield in Zhaozhou area of Heilongliang, China, Zhaozhou water conservancy scientific research station was chosen as the test site. Combined with drip irrigation under film, the irrigation quota was set at four levels(200, 300, 400 and 500 m³/ha) and irrigation was implemented for two, three and four times, and the soil moisture in different soil depth, soil soluble salt concen-tration, and maize grain yield were determined and analyzed. The results showed that when the irrigation quota was 400 m³/ha and irrigation times were four times, the yield of maize reached the maximum, and the effect of salt inhibi-tion on root parts was better, which was a more economical and reasonable irrigation system.