穴状衬膜客土基盘水盐动态对比研究

通过对试验地泥质盐化土进行穴状衬膜和配置客土基盘等措施的改造,并对含盐量不同的Ⅰ号、Ⅱ号、Ⅲ号台田穴内穴外水盐动态数据进行收集,研究减少大规模客土绿化,简单而又切实可行的盐碱地绿化种植模式。结果表明:Ⅰ号、Ⅱ号、Ⅲ号台田穴内含水率值及电导率值与穴外相比,穴内平均含水率值均高于穴外,且靠近苗木根系处20—40cm土层含水率值达到最大;穴内的平均电导率值均低于穴外,且在60—80cm土层由于石砾隔盐层的排盐阻盐作用电导率值最低。研究结果表明:穴状衬膜客土基盘能够有效地减少栽植穴内水分蒸发渗透和穴外土壤盐分的渗入,起到了保水阻盐的作用,为苗木生长提供了一个良好的局部土壤环境。因此,此造林模式可降低土壤含盐量,进而提高苗木的成活率和保存率,比单纯客土造林费用低,加之操作简单易于实现,具有广阔的推广前景。

Comparative Study on Water-Salt Dynamic of Hole-based Padded Film with New Soil

In order to investigate the simple and practical afforestation patterns on saline land which can reduce the waste of large-scale new soil,variety of reform measures were applied to clay salinization soil including hole-based padded film and configuring hole-based with new soil,etc.At same time,water-salt dynamic data was collected at points of inside and outside hole in the platformⅠ,Ⅱ,Ⅲ with different salinity.Results showed that: moisture content and conductivity of the platformⅠ,Ⅱ,Ⅲ in the hole compared with the outer,the average moisture content inside the hole was higher than outside,and soil moisture content at 20—40 cm of the seedling root reached the maximum value;the average conductivity inside the hole was lower than outside,and soil conductivity at 60—80 cm met the minimum because of the gravel layer draining and preventing salt.Hole-based padded film with new soil effectively reduced water infiltration and evaporation in the planting hole,and prevented the infiltration of soil salinity outside.It played a role in preventing the infiltration of salt and reducing the evaporation.So,it provided a good local soil environment for seedling growth.Therefore,the model can reduce soil salinity,as well as improve seedling survival and preservation rate.In addition,it has a lower cost than completely new soil,is simple to operate and is easy to implement,and will be broad prospects.