地下滴灌苜蓿种子田土壤养分及盐碱分布规律

Distribution of Soil Nutrients and Saline-alkali Composition in Alfalfa Seed Field under Underground Drip Irrigation

为探明地下滴灌模式下多年生苜蓿种子田土壤中的养分和盐碱分布规律,为科学利用地下滴灌进行苜蓿种子生产提供指导。本研究以滴灌带正上方地面为起始点,对垂直方向0~60 cm、水平方向0~40 cm范围内的土壤取样分析。结果表明地下滴灌4年淋洗导致了新牧4号紫花苜蓿种子田土壤中的养分与盐碱存在异质性分布,养分主要分布于垂直距离0~30 cm、水平距离0~20 cm的土壤;盐分主要聚集于距地表垂直距离30~40 cm、距滴灌带水平距离30~40 cm的土壤;土壤碱性较强区域为距地表垂直距离30~60 cm、距滴灌带水平距离20~40 cm的土壤。

This study aimed to explore the distribution of nutrients and saline-alkali composition in the soil of perennial alfalfa seed field under the subsurface drip irrigation mode, and to provide guidance for the scientific use of subsurface drip irrigation for alfalfa seed production. Taking the ground directly above the drip irrigation belt as the starting point, the soil samples within the range of 0~60 cm in the vertical direction and 0~40 cm in the horizontal direction were analyzed. The results showed that four years of subsurface drip irrigation resulted in the heterogeneous distribution of nutrients and saline-alkali composition in the soil of the seed field of Xinmu No. 4 alfalfa. The nutrients were mainly distributed in the soil with a vertical distance of 0 ~30 cm and a horizontal distance of 0 ~20 cm;the salts were mainly concentrated in the soil with a vertical distance of 30~40 cm from the surface and a horizontal distance of 30~40 cm from the drip irrigation belt;the soil with strong alkalinity was 30~60 cm vertically from the surface and 20~40 cm horizontally from the drip irrigation belt.