地面灌溉土壤入渗参数时空变异性试验研究

Evaluating Spatial and Temporal Variability of Infiltration on Field-Scale under Surface Irrigation

基于典型田块的试验观测数据,开展地面灌溉条件下冬小麦生长期间土壤入渗性能时空变异性的试验研究,描述土壤入渗参数的时空变异分布特征,分析各参数间存在的相关关系。结果表明,在冬小麦生长期内,土壤入渗参数的空间变异强度呈持续性减弱趋势,其时间变异性逐渐下降并趋于稳定。土壤入渗性能在冬灌后各时段间的差异并不显著,故在此后的灌溉试验设计与管理或地面灌溉模拟中,可基本无需考虑土壤入渗性能的时间变异性影响。考虑到土壤入渗参数f0和Z180之间存在着强烈的互相关性和非常相近的时空变异分布特征,可借助f0的时空变异分布特点达到描述土壤入渗性能、衡量土壤入渗能力的目的。

Based on the observation datum of typical field, experiment study on the spatial and temporal variability of infiltration have been performed on a surface irrigation field during the growing period of winter wheat, the distribution characteristic of spatial and temporal variability of infiltration parameters were described, and the correlation between different parameters were analyzed. Results showed that the spatial variability of soil infiltration parameters continually decreased during the growing period of winter wheat, the temporal variability gradually weakened and became stable. The difference of infiltration capacity was not obvious after pre-irrigation, so the effect of temporal variability can be neglected in the field irrigation design and management, or surface irrigation simulation. Because of the strong correlation and similar spatial and temporal variability between f0 and Z180 , the distribution characteristic of spatial and temporal variability of f0 can be used to describe the soil infiltration characteristic and weigh the soil infiltration capacity.