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对天然更新米槠林、人工促进更新米槠林、杉木幼林和杉木中龄林等林地土壤的孔隙组成和养分状况作了研究分析。结果表明 :与天然更新米槠林相比 ,人工促进更新米槠林、杉木幼林和杉木中龄林林地的土壤总孔隙度、非毛管孔隙度、自然含水率和通气度均下降 ,容重增大 ,土壤结构性变差 ,通气性和渗透性减弱 ,土壤蓄水能力下降 ,土壤有机质、全量养分、速效养分和pH值均减少 ,土壤的保肥供肥能力变差 ,土壤肥力下降。这说明自然更新米槠林更少受到人为干扰 ,枯落物数量和质量均优于其他林分 ,有利于养分的贮存和转化 ,对土壤肥力的保持作用更明显。表 2参 1 0
The pore composition and nutrient status of natural regeneration Mianyanghuang, artificially promoting regeneration of Mianyanlin, Cunninghamia lanceolata and Cunninghamia lanceolata were studied. The results showed that the total porosity, non-capillary porosity, natural water content and aeration of Artemisia scoparia, Cunninghamia lanceolata and Cunninghamia lanceolata were lower than those of the natural regeneration Mianyanzhan, Soil structure deterioration, permeability and permeability weakened, soil water storage capacity decreased, soil organic matter, total nutrients, available nutrients and pH were reduced, the soil fertilizer and fertilizer supply capacity, soil fertility decreased. This indicates that natural regeneration of Mirabalan is less affected by anthropogenic disturbance, the quantity and quality of litter are better than other stands, which is conducive to the storage and transformation of nutrients and has a more obvious effect on the maintenance of soil fertility. Table 2 Senate 1 0