水科学进展2016，Vol.27Issue(1)：31-39,9.DOI:10.14042/j.cnki.32.1309.2016.01.004
采用间歇灌溉进行土壤盐分淋洗的适用性
Feasibility of applying intermittent irrigation on solute leaching
摘要
Abstract
In order to compare leaching efficiencies of continuous and intermittent irrigations, the HYDRUS-1D dual-porosity model was applied to simulate water and salt movement in soils under difference schemes of irrigation. Results showed that there was a critical depth above which intermittent irrigation would result in higher salt leaching efficiency. Simulations of sandy soils showed that when total irrigation amount was 20 cm, critical depth would decline from more than 60 cm to 0 cm as potential evaporation rate increased from 0 mm/d to 6 mm/d;but it would rise from 20 cm to al-most 80 cm as total irrigation amount increased from 10 cm to 40 cm when potential evaporation rate was fixed to be 2 mm/d. Generally, soils with higher water conductivity, higher porosity of micro-pores and lower exchange rate of water and solute between micro and macro pores held higher critical depth, and simulations of sandy, loamy sandy, loamy, clayey loamy and clayey soils indicated that sandy soils were more likely to hold higher critical depth. When total irrigation amount was 30 cm and potential evaporation rate was 2 mm/d, critical depth of clay and sandy soil were 56 cm and more than 100 cm, respectively. In conclusion, there is no universal answer on whether intermittent irriga-tion would promote leaching efficiency, but critical depth could explain former contradict conclusions on this problem.关键词
间歇灌溉/盐分/HYDRUS-1D/非均匀流/土壤质地Key words
intermittent irrigation/salt/HYDRUS-1D/non-equilibrium flow/soil texture分类
水利科学引用本文复制引用
彭振阳,伍靖伟,黄介生..采用间歇灌溉进行土壤盐分淋洗的适用性[J].水科学进展,2016,27(1):31-39,9.基金项目
国家自然科学基金资助项目(51379151 （）
51279142) The study is financially supported by the National Natural Science Foundation of China (No. 51379151 （）
No. 51279142) . （）
