季节性冻融条件下草地入渗特性的试验研究

通过对比分析季节性冻融条件下草地与裸地入渗试验结果,得到了草地冻融条件下的入渗规律。结果表明,在冻融各阶段,地表0~40 cm深度范围内,草地地温均高于裸地,但土壤含水率低于裸地;在土壤初冻和融化阶段,草地入渗90 min累积入渗量大于裸地,但其初始入渗强度小于裸地初始入渗强度;在土壤完全处于冻结状态时,草地与裸地的入渗过程、入渗量基本相同。研究结果为草地冻融土壤入渗特性的进一步研究奠定基础,为区域水土保持与生态修复工程及季节性冻土区冬春灌溉提供参考。

Characteristics of Soil Infiltration in Grassland Under Seasonal Freezing and Thawing Condition

Based on the infiltration experiments of grassland and bare plots under freezing and thawing condition,the infiltration characteristics of the grassland plots and bare plots were analyzed.Results show that the temperature in grassland is higher than that in bare plot from 0 to 40cm depth,but the soil moisture is lower than that in bare plot during seasonal freezing and thawing period.In initial freezing and thawing stage,the 90 min cumulative infiltration amount of grassland plot is higher than that of bare plot,but the infiltration intensity of grassland plot is lower than that of bare plot.The infiltration characteristics of grassland plots are almost same with bare plots during the steady freezing stage.The research results will provide a basis for further study on infiltration characteristics of grassland under seasonal freezing and thawing condition,and also can be taken as a reference for the conservation of soil and water,ecology renovation and irrigation engineering in winter and spring in seasonal freezing and thawing region.