膜下滴灌模式下棉花不同生育阶段土壤水分的空间变异性研究

Study on Spatial Variability of Soil Moisture Parameter under Drip Irrigation of Plastic Film at Different Growing Stages of Cotton

【目的】以膜下滴灌棉田为材料,研究棉花不同生育期土壤水分的空间变异规律。【方法】采用均匀网格法布点方式,测定了滴灌棉田苗期、蕾期、花铃期和吐絮期的各个采样点0～20、20～40和40～60cm三个不同深度的土壤含水率。【结果】膜下滴灌模式下的棉田土壤水分的空间变异性,相对于整个生育期,各层土壤水分的空间变异性随着棉花的生长而增大。相对于整个生育期的不同垂直深度,各层土壤水分的空间变异性是随着采样土层深度的加深而减小。【结论】由于表层土壤水分受人为等因素影响,0～20cm层土壤水分的空间变异性比较复杂。

[Objective]Taking drip-irrigated cotton under plastic mulch as the trial material to analyze the regularity of the spatial variability of the soil moisture at different growing stages.[Method]Based on grid sampling,soil samples were obtained from each point under three layers of 0-20,20-40 and 40-60 cm at different growing stages.[Result]The spatial variability of soil moisture under drip crrigation of plastic mulch at different growing stages of catton were detected.The spatial variability of each layer soil moisture was decreased with the deepening of sampling soil layer.[Conclusion]Because the artificial factors easily influence the top layer soil moisture,the spatial variability of the soil moisture in 0-20 cm layer is varied.