摘要
为了探讨振动深松耕作措施对不同类型土壤的水分特征曲线的影响,利用吸力平板仪和压力膜仪对黑龙江省5种典型土壤,即黑土、黑钙土、水稻土、苏打盐碱土、沙土进行了测定。得到振动深松区和对照区的原状土壤在脱湿过程中不同吸力下的土壤含水率,并利用van Genuchten数学模型对5种土壤的水分特征曲线的实测值进行数值拟合,对比研究了5种土壤水分特征曲线及模型拟合参数、土壤当量孔径、土壤水分有效性及比水容量的变化。结果表明,振动深松前后土壤水分特征曲线差异显著。同一吸力下,深松区土壤含水率高于对照区,振动深松显著提高了土壤的有效供水能力,其中效果最佳的是苏打盐碱土和黑土。振动深松通过改善土壤结构,调整了孔隙孔径的比例,进而提高了土体的有效供水能力。
This paper investigated the impact of vibration-tillage of subsoil on water retention curves offive differ- ent soils in Heilongjiang Province： Black soil, Chernozem soil, Paddy soil, Soda-saline soil, and sandy soil. Soil moisture under different matric potential controlled by tension table and pressure membrane apparatus was mea- sured during both drying and wetting processes. The measured water retention curves were then fitted to the van Genuchten formula. The differences between the water retention curves, best-fitting parameters, equivalent pore size, soil moisture availability and specific water capacity of the five soils were assessed. The results showed a significant change in water retention curves of the same soil before and after the vibration-tillage. At the same matric potential, the soil water content after vibration-tillage was higher than that before the tillage. Vibrating the subsoil appeared to have significantly improved the availability of soil water, especially for the soda-saline and the black soils. Vibration-tillage of subsoil changed soil structure and increased soil porosity, thereby enhancing the ability of soil to retain and supply water.
出处
《灌溉排水学报》
CSCD
北大核心
2017年第5期52-58,共7页
Journal of Irrigation and Drainage
基金
"十二五"国家科技支撑计划项目(2012BAD08B05)
水利部948计划项目(201121)
关键词
土壤水分特征曲线
振动深松
持水性
有效水
比水容量
soil water retention curve
vibrating subsoiling tillage
water holding capacity
soil moisture avail- ability
specific water capacity
