不同植被类型对青龙湾沙区土壤物理性状的影响

Influence of the Different Type of Vegetation on the Physical Property of the Soil in Desert Area of Qinglongwan

[目的]通过研究土壤的物理性状变化,来了解不同植被类型对沙区土壤的改良效果。[方法]采用分层取样法,对青龙湾沙区7种不同植被类型的土壤容重、毛管孔隙度、非毛管孔隙度及总孔隙度等指标进行测定分析。[结果]青龙湾沙区土壤容重在1.010-1.621 g/cm3,总孔隙度在42.48%~63.66%,土壤容重和孔隙度呈反比。不同植被类型对土壤的防护和改良作用存在差异,除农田外,果园改良效果最好,毛白杨与刺槐混交林次之,小叶杨林最差。[结论]经过生态林改良后的土壤物理性状得到明显改善。

[Objective] The efficiency of the different type of vegetation improving the soil in desert area was explored through the research on the variation of its physical property.[Method] The bulk density,porosity,non-porosity and total porosity and other indexes were measured and analyzed by means of porosity.[Result] The results showed that the bulk density of soil ranged from 1.010-1.621 g/cm3,the total porosity of soil was in the range between 42.48%-63.66%,which indicated there was negative relationship between bulk density and total porosity.The different types of vegetation in the protection of soil and its improvement varied and the best improving effect was for the orchard,then the middle,mixed forest of Populus tomentos-Robinia pseudoacacia;the worst,Populus simonii;except farmland.[Conclusion] The physical property of soil was obviously improved after the soil was modified by ecological forest.