不同退耕还林模式对土壤修复作用的研究——以甘肃省庆阳市为例

以甘肃省庆阳市为例,探讨了退耕还林对土壤理化性质的影响,结果表明:坡耕地退耕后,有机质和营养元素的含量渐趋恢复,土壤容重、pH值减小,土体中团聚体的数量增大,土壤结构不断得到改善。其中刺槐×沙棘混交林地速效养分丰富,粘粒和≥0.25mm水稳性团聚体的数量大;侧柏×沙棘混交林地则酸性强,容重低,≥50μm的微团粒含量较高。刺槐×沙棘混交林对土壤的修复作用明显强于侧柏×沙棘混交林。

Research on Effect of Different "Conversion of Farmland to Forest" Practices on Soil Remediation --Take Qingyang City of Gansu Province as an example

The thesis takes Qingyang City of Gansu Province as an instance,having explored the impact on the physical and chemical properties of soil of the land returning to forest.The result shows: after the sloping land has changed to forest land,the content of organic matter and nutrition element resumes gradually,soil bulk density and pH value reduce,the number of aggregates increases and the soil structure is improved constantly.There is abundant radily nutrient in the locust×sea-buckthorn mixed forest,and there are a mass of clay and water-stable aggregate which is ≥0.25mm in it.The pH value of the arborvitae×sea-buckthorn is high and bulk density is low.The content of micro aggregate which ≥50μm of it is relatively high.The function in soil remediation of locust×sea-buckthorn mixed forest is obviously stronger than arborvitae×sea-buckthorn mixed forest.