摘要
该文研究土壤结构改良剂对土壤水分动力学参数的影响。通过对试验数据进行初步分析后得出 :加入土壤结构改良剂后 ,土壤饱和导水率有所提高 ;各处理的非饱和扩散率与对照相比 ,施加土壤结构改良剂的处理 ,在水平土柱试验中 ,远水端同一距离处土壤含水率要低于对照处理的含水率 ;土壤结构改良剂具有良好的吸水和保水性能 ,使得土壤的持水能力增强。在水势相同的情况下 ,与对照相比 ,施加土壤结构改良剂的土壤可保持更多的水分 ,并增加土壤中有效水含量。施加部位不同 ,土壤结构改良剂对土壤所持水分的含量也有较大差别 ,说明在实际应用中土壤结构改良剂的施用方法和施用深度也是影响土壤水分状况的一个较为重要的因素。
In this paper, the effects of soil amendments on soil hydrodynamic parameters were studied. The results showed that, with soil amendments application, saturated hydraulic conductivity increased; unsaturated diffusivity was also affected. Compared with control, at the same distance far from water supply in horizontal column, water content was lower than that of control. With high water absorbing and holding capacities of soil amendments, soil treated with soil amendments can preserve more water than that without treatment. Soil amendments can increase content of effective soil water. Because applying part was different, there was a big difference in water content amon treatments. The result implied that way and depth of soil amendment application were important factors which affected soil water condition.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2003年第4期37-39,共3页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金资助项目 (50 1 790 35)
关键词
土壤结构改良剂
土壤水分动力学
导水率
扩散率
polyacrylamide(PAM)
soil hydrodynamic parameter
hydraulic conductivity
diffusivity
