微咸水滴灌对枸杞产量及土壤水盐运动的影响

Characteristics of Soil Water and Salt Movement under Drip Irrigation with Brackish Water on Chinese Wolfberry

在宁夏银北盐碱地区开展枸杞微咸水滴灌试验,探讨淡水（矿化度0.5 g/L左右）与微咸水（矿化度3 g/L左右）在不同灌水量下对土壤水盐运移特征及枸杞产量的影响。结果表明,根层0~40 cm土壤含水量的变化在空间与时间上受灌水量的影响较明显,灌水量越小,土壤含水量越低。土壤pH、全盐空间分布显示,不同处理土壤pH整体表现为表层最低,并随土壤深度的增加逐渐增高,且灌水量越大,土壤表层0~20 cm pH越低;土壤全盐受灌水量影响显著,受水质影响较小,灌水量越大土壤全盐含量越高,表层盐分累积越明显。枸杞产量在同一灌水量下淡水与微咸水滴灌无显著性差异;不同灌水量下差异极显著,淡水滴灌产量略高于微咸水滴灌。

With the problem of water resources lacking standing out,agricultural irrigation water is severe shortage in saline areas of north Ningxia.In order to alleviate this problem,developing and using brackish water resources are particularly important.The drip irrigation with brackish water test was conducted in this area,and the effect of fresh water（Salinity 0.5 g/L） and brackish water（Salinity 3 g/L） with different irrigation quantity on the characteristic of soil water and salt movement and the yield of Chinese wolfberry were discussed.The results showed that soil water content was subjected to the impact of irrigation quantity in space and time,the greater amount of irrigation,soil water content expressed greater,and the influence of irrigation water was slightly smaller.About soil total salt,three irrigation quota of brackish water,the greater amount of irrigation,the accumulation of soil surface salt was more,and soil total salt was more under the spatial distribution.But the soil total salt was more only near wet soil under fresh water drip irrigation,and was lower than the brackish water.About the changes of Chinese wolfberry yield,the drip irrigation with fresh water and brackish water was no significant difference under the same amount of irrigation;and it was significant difference under the different amount of irrigation,the yield of fresh water was slightly higher than the brackish water.