滴灌频率对土壤水盐动态的影响过程研究

发布时间：2018-06-15 07:21

本文选题：滴灌 + 滴灌频率　；参考：《节水灌溉》2017年09期

【摘要】：为了探明高频滴灌的抑盐机理,在土槽内对不同滴灌频率下的土壤水盐动态进行了试验研究。试验中滴灌频率设4个处理,分别标注为IF1、IF2、IF3和IF4;相应的单次滴水量分别为2、3.33、5和10 L;滴水间隔分别为1、2、3和4 d;各处理的滴水总量都为10 L。试验中分别观测了单次滴水量和滴水间隔天数对土壤盐分运移的影响以及导致的脱盐效率。试验结果表明,高频滴灌时,滴水可使土壤盐分运移速度快,而蒸发不会使土壤盐分快速向上运移,而蒸发不会使土壤盐分即刻向上层运移,所以土壤始终表现为上层脱盐,下层积盐;在总滴水量相同的情况下,单次滴水量越大,土壤盐分淋洗得越深,抑盐效果越好;在没有地下水补充的情况下,滴水间隔天数所造成的蒸发返盐量有限,当滴水间隔天数较小(小于2 d)时,土壤盐分持续向下层运移,没有返盐的机会,只有当滴水间隔天数较大(大于2 d)时,盐分才会沿土层垂直方向上、下波动,使下层积盐深度变浅。
[Abstract]:In order to find out the salt inhibition mechanism of high frequency drip irrigation, the soil water and salt dynamics under different drip irrigation frequencies were studied in soil trough. In the experiment, the drip irrigation frequency was divided into 4 treatments, which were labeled as IF1, IF2, IF3 and IF4, respectively, the corresponding single drip water volume was 20.33 and 10L, the interval of drip water was 1g / 2t / 3 and 4 days, respectively, and the total amount of drip water in each treatment was 10L. The effects of single drip amount and interval days on soil salt transport and desalination efficiency were observed. The results show that the soil salt transport rate is faster when drip irrigation is high frequency, but evaporation does not make the soil salt move up quickly, and evaporation does not make the soil salt move to the upper layer immediately, so the soil always shows desalination in the upper layer. The lower layer salt; the greater the amount of single drip, the deeper the soil salt leaching, the better the salt suppression effect is; and in the absence of groundwater recharge, the amount of evaporation and salt return caused by the days between drops is limited. When the days of drip interval were smaller (less than 2 days), the soil salt moved continuously to the lower layer, and there was no chance of returning salt. Only when the days of dropping water interval was larger (> 2 days), the salt would fluctuate along the vertical direction of soil layer. Shallowen the lower layer of salt.
【作者单位】：石河子大学水利建筑工程学院;
【基金】：新疆生产建设兵团软科学项目(2011BB039) 国家自然科学基金项目(51569028)
【分类号】：S156.4;S275.6

【相似文献】