微区作物种植条件下不同调控措施对土壤水盐动态的影响特征

本文研究了在试验微区内进行作物种植条件下不同调控措施对土壤表层20cm和土壤中层50cm处的电导率和0~120cm土壤水分的影响。分析了作物种植条件下土壤的水盐动态变化规律和引起变化的原因。综合考虑了灌溉水矿化度、灌水次数、灌水量,有机肥施用量及覆盖5种不同试验因素下,土壤水分和盐分在不同阶段的变化过程及机理的差异。得出试验因素影响因子对土壤水分盐分动态的作用及其调控机制;试验因子对土壤水盐动态的权重性分析和试验结果指标的综合因素分析;咸水或者边缘水质灌溉水利用过程中的土壤盐分动态与防盐调控机制,阐明了土壤水盐变化规律及其作用机理。

EFFECTS OF REGULATION MEASURES ON WATER AND SALT REGIME OF SOIL

Based variation of electric conductivity in 0~20cm soil layer and water density in 0~120cm soil layer, effects of different regulation measures on water and salt regime of soil under cropping in microplots were studied. Patterns of the dynamic variation of water and salt regimes and causes of the vairation were also analyzed under continuous cropping in fields. By taking into account the five factors in the experiment, such as water mineralization degree, times of irrigation, irrigation rate, organic manure application rate and crop coverage, differences in courses and mechanisms of the variation of water and salt in the soil between different stages were explored. Effects of the influencing factors on soil water and salt movement and their mechanisms were investigated. Weighing analysis of the soil water and salt movements by the experimental factors and integrated factor analysis of the experiment results and indexes were performed. The soil water salt movements during the course of utilizing salt water and barely usable water in irrigation and its mechanism for salinity control were studied. And on these bases, the pattern of the changes in soil water and salt and the mechanism of the action were elaborated.