长期膜下滴灌棉田土壤水盐分布变化及其对棉花生长影响

以库尔勒市包头湖农场长期膜下滴灌棉田为研究对象,通过连续3年棉田整个生育期土壤水分和盐分含量的测定,对长期膜下滴灌棉田土壤水盐分布变化及其对棉花生长影响进行了研究。结果表明:各年份土壤平均含水率在整个生育期呈降增降的趋势,平均含盐量呈增降增的趋势;20~50cm土层土壤含水率较高,土壤盐分在30~50cm土层聚积;土壤含盐量高于0.51%时产量开始受到抑制,高于1.79%时棉花产量将降低为零。

A Study on the Changes of Distribution of Soil Moisture and Salinity and its Impact on the Growth of Cotton in Long-term drip Irrigation Cotton Field

In this study ,the drip irrigation cotton field in Baotouhu farm of Korla city is taken as the study object ,through the test of soil moisture and salinity throughout the whole growing period in 3 consecutive years ,the changes of distribution of soil moisture and salinity and its impact on the growth of cotton in long-term drip irrigation cotton field are studied .The results show that the average soil moisture decreases first ,then increases and then decreases in the whole growing period in different years ,while the average sa-linity increases first ,then decreases and then increases .The highest soil moisture appears in the depth of 20~50 cm ,the highest sa-linity appears in the depth of 30~50 cm .When the salinity is more than 0 .51% ,the production begins to be suppressed .If the sa-linity is more than 1 .79% ,there will be no production .