摘要
通过田间试验研究高垄覆膜滴灌模式下不同土壤基质势对盐碱地新疆杨生长以及土壤盐分分布的影响。试验设5个水平的土壤基质势处理:-5kPa(S1),-10kPa(S2),-15kPa(S3),-20kPa(S4),-25kPa(S5),每个处理重复3次,按随机区组布置。试验结果表明,2009年生育末期,根系周围土体中的盐分比移栽前土壤中的盐分减小了67%,并且杨树的存活率达到96%以上。第二年开始进行不同的水分管理,各处理土壤中含盐量有所不同,其中土壤基质势下限为-5kPa与-10kPa时灌水量较大,盐分淋洗效果较好,根系周围的土体中的平均含盐量比移栽前减少了79%,而土壤基质势下限控制在-25kPa的处理由于灌水量较小,盐分随土壤深度增加的幅度较大,当土壤深度达到40cm时土壤盐分出现大幅度的增加。在经过2年生长后,各处理杨树存活率均在92%以上。随着灌水量的增加杨树胸径增长量增大。该研究结果对新疆地区盐碱地杨树种植以及灌溉制度的制定具有理论意义和应用价值。
Field experiments were conducted to investigate the effects of soil matric potential under ridge-mulch drip irrigation on poplar growth and soil salt distribution in saline soil land.The experiment included five treatments,in which controlled the soil matric potential higher than-5 kPa（S1）,-10 kPa（S2）,-15 kPa（S3）,-20 kPa（S4） and-25 kPa（S5）,respectively.All treatments were repeated three times with the experimental plots following a complete randomized block design.Results showed that after the first irrigation season,the root zone soil salinity in the whole soil profile decreased by 67% compared with that before transplanting.Different irrigation regimes applied in the second year and soil salinity content were different for each treatment.Due to more amount of irrigation water applied in S1（-5 kPa） and S2（-10 kPa） treatments,more soil salt was leached effectively than that in other treatments and the root zone salt salinity decreased by 79% compared with that before transplanting.Owing to less amount of irrigation water applied in S5 treatment,more soil salt rose with the decreasing of soil depth than those in the other treatments and the soil salinity increased dramatically when the soil depth was below 40 cm.After two years growth,the survival rate of each treatment was kept above 92%.Additionally,the increased amount of poplar DBH rose with the increasing amount of irrigation water.The research results have a theory and application value for the water and soil salt regulation and poplar irrigation scheduling on saline-sodic land.
出处
《灌溉排水学报》
CSCD
北大核心
2012年第5期1-6,共6页
Journal of Irrigation and Drainage
基金
中国科学院西部行动计划项目(KZCX2-XB2-13)
关键词
滴灌
盐渍土
杨树
土壤水分管理
盐分分布
drip irrigation
saline soil
poplar
soil water management
salt distribution
