摘要
基于大田土壤入渗试验,讨论了玉米秸秆覆盖对土壤冻融特点及入渗能力的影响。实验结果表明,秸秆覆盖地块的初始冻结时间约滞后裸地45 d,最大冻结深度滞后裸地约14 d;秸秆覆盖后,土壤的入渗能力先增大,而后随着冻层的形成和发展,入渗能力逐渐减弱,冻融期土壤入渗能力(H90)随冻融历时的变化过程很好地符合三次多项式关系,秸秆覆盖地的最小H90为23.5mm,比裸地高27.0%,最小入渗能力的出现时间滞后裸地约18 d。研究结果可为季节性冻融区冬春灌溉合理技术参数的确定提供参考依据。
Based on soil field infiltration test, the effects of corn straw mulch on freezing-thawing soil infiltration capacity are discussed. The results show that the beginning of soil freezing in corn straw covered plot, comparing to bare plot, is about 45 days later and maximum frozen soil depth two weeks later. The infiltration capacity（H90）will be enhanced after mulching the corn straw, as the development of frozen soil the Hg0 decreases gradually, the change of H90 is fitted to cubic multinomial model during the seasonal freezing-thawing period. The minimum H90 of corn straw mulched plot is 23.5 mm, higher than bare plot about 27.0 percent, the time that the minimum H90 of corn straw mulched plot is about 18 days later than bare plot. The results would provide basis for determining reasonable winter and spring irrigation parameters in seasonal freezing-thawing areas.
出处
《太原理工大学学报》
CAS
北大核心
2007年第1期60-62,66,共4页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(40472132)
关键词
冻融土壤
入渗
玉米秸秆覆盖
freezing-thawing soil
infiltration
corn straw mulch
