土壤理化性质在不同强度采伐干扰下的响应及其评价

对南方丘陵山区在不同强度人为干扰弱度择伐(13.0%)、中度择伐(29.1%)、强度择伐(45.8%)、极强度择伐(67.1%)和皆伐]10 a后的土壤理化性质进行分析。结果表明,经过10 a的恢复,弱度和中度择伐样地土壤结构稳定性、水分、孔隙状况和养分含量得到恢复,并有所改善,而强度择伐、极强度择伐和皆伐迹地土壤各项指标仍未恢复,其破坏程度均随采伐强度的增大而加剧。经主成分分析得出全K、速效K、速效P、有机质、全N、非毛管孔隙度、土壤密度、最小持水量、最大持水量、总孔隙度10项指标,能较好地反映林地土壤理化性质的变化状况,不同强度采伐对林地土壤理化性质的干扰程度依次为皆伐作业>极强度择伐>强度择伐>中度择伐>弱度择伐。

Responses of soil physical and chemical properties to impacts of different cutting intensity and its evaluation

The responses of soil physic-chemical properties in South China to impacts of different cutting intensity(low intensity,13.0%;middle intensity,29.1%;high intensity,45.8%;over-high intensity 67.1%;clear cutting) were quantitatively analyzed.The results showed that soil aggregate stability,moisture content,porosity and nutrient of low and medium selective cutting plots have been recovered basically;furthermore some indexes have been partly improved in 10 years after cutting.But those in high intensity,over-hi...