论文部分内容阅读
为探讨华家岭低效防护林带改造对土壤的改良效果,在华家岭地区选取生长不良的低效杨树纯林和改造后的云杉纯林、云杉×杨树、云杉×油松、云杉×落叶松混交林5种典型林带类型,对其土壤理化性状进行对比研究。结果表明:(1)云杉纯林及其混交林土壤的平均容重、平均毛管孔隙度、总孔隙度、通气度与杨树纯林的差异显著(p<0.05),经过低效林改造后的云杉纯林及其混交林较杨树纯林的土壤容重有所下降,孔隙度和通气性有所提高。(2)除速效P外,各林型的土壤速效N、速效K、全N、全P、全K和有机质含量随土层深度的增加而降低;云杉纯林及其混交林的土壤有机质含量、速效N、P、K和全量N、P、K养分均高于杨树纯林,pH值低于杨树纯林。(3)云杉纯林及其混交林的有机质含量和全N含量与容重和总孔隙度的相关性较杨树纯林的好,云杉纯林及其混交林对土壤理化性能的改良作用优于杨树纯林。
In order to explore the improvement effect of the low-efficiency shelterbelts on the soil in Huajialing, low-growth and poor-growth poplar pure forest, rehabilitated pure spruce forest, spruce × poplar, spruce × pine, Spruce × larch mixed forest five kinds of typical forest types, the soil physical and chemical properties were compared. The results showed that: (1) The average bulk density, average capillary porosity, total porosity and aeration of pure Picea mongolica and its mixed forest were significantly different from those of pure Populus davidiana (p <0.05) Cunninghamia lanceolata and its mixed forest had a lower soil bulk density than that of pure stands, and porosity and aeration had been increased. (2) Soil available N, available K, total N, total P, total K and organic matter content of all forest types decreased with the increase of soil depth except for available P; soil organic matter Content, available N, P, K and total N, P, K nutrients were higher than pure poplar, pH value is lower than pure poplar. (3) The correlation between organic matter content, total N content, bulk density and total porosity of Picea schrenkiana and its mixed forest is better than that of pure Picea crassifolia forest and pure Picea and its mixed forest on soil physical and chemical properties Poplar pure forest.