基于土壤入渗参数空间变异性的畦灌灌水质量评价

畦灌灌水质量的客观评价是制定合理灌水方案的重要基础。该文假定土壤空间变异性主要体现在入渗系数的变化上,以在杨凌区一级阶地和三级阶地上进行的大田畦灌试验为例,分析土壤空间变异性对畦灌灌水质量的影响,并揭示畦灌灌水质量变化规律。结果表明灌水效率、灌水均匀度和储水效率随入渗系数的变异系数增大均呈现下降趋势,其中灌水效率和储水效率下降幅度较小,而灌水均匀度下降幅度较大。由此说明土壤入渗系数的变异性对灌水均匀度影响最大,而对灌水效率和储水效率影响相对较小。该文的研究方法对畦灌灌水质量评价结果可更好地反映客观实际,从而为制定合理的灌水方案提供依据和技术支持。

Evaluation of border irrigation performance based on spatial variability of infiltration parameters

Objective evaluation on border irrigation performance is an essential basis to set up a proper irrigation scheme. Assumed that the soil characteristics spatial variability can be directly reflected from the changes of infiltration coefficient, taken the border irrigation experiments conducted in Yangling District with the clay loam and sandy loam as study objects, the effects of the soil characteristics spatial variability to irrigation performance were analyzed and the changes of irrigation performance of border irrigation were revealed. Results showed that irrigation efficiency, distribution uniformity and storage efficiency decreased with the infiltration variation coefficient increased. The decrease range of the irrigation application efficiency and storage efficiency was smaller respectively compared with that of distribution uniformity. Therefore the spatial variability of soil infiltration coefficient has greater effect on distribution uniformity than the irrigation application efficiency and storage efficiency. The method proposed in this paper can much better reflect the actual irrigation performance of border irrigation and provide a proper irrigation scheme with theoretical foundation and technological support.