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在水土流失区,夏秋季节土壤因高温缺水致使水土保持植树造林难于成活。为了揭示土壤水分的变化情况,寻求植物安全越夏的栽植深度,对三种主要侵蚀土壤,在不同植被下,4—9月份进行了定点土壤水分观测。结果表明,第四纪红土母质红壤和紫色土,在夏秋季节,土深30厘米左右的水分含量变化比较稳定。而花岗岩母质红壤,30厘米以下土层的土壤水分,明显的较上层高。同时说明地被物对提高土壤的保水能力有很大的作用,并提出了在花岗岩流失区,提高树木成活率的栽植方法的建议。
In the soil and water loss areas, soil erosion caused by high temperature in summer and autumn makes soil and water conservation afforestation difficult to survive. In order to reveal the change of soil moisture and seek the planting depth of plant safety in summer, soil moisture of the three main types of eroded soil was measured under different vegetations from April to September. The results show that the Quaternary red clay and purple soil, in the summer and autumn, soil moisture content of about 30 cm change relatively stable. The granite parent red soil, soil moisture below 30 cm soil, significantly higher than the upper layer. At the same time, it shows that the ground material plays a very important role in improving the water holding capacity of the soil, and puts forward the suggestion of planting methods to improve the survival rate of the trees in the granite drainage area.