武夷山保护区不同封育年限毛竹林的土壤特性

Soil properties of Phyllostachys edulis forest with different enclosure years in Wuyishan nature reserve

以封育年限为0、3、5、10、15、40 a毛竹混交林作为调查对象,对不同土层的土壤理化性质进行分析和评价.结果表明:土壤密度随着封育年限的增加不断降低;不同封育年限的非毛管孔隙度之间不存在显著差异(P>0.05);随着封育年限的增加,不同土层的含水率、毛管孔隙度以及有机质、碱解氮、有效磷和速效钾的质量分数逐步提高,土壤pH值与全钾质量分数无明显变化,有机质质量分数在封育第40年达到最高,为61.92 g·kg^(-1);6个封育年限毛竹林群落土壤肥力质量由高到低表现为40 a>15 a>10 a>5 a>3 a>0 a.武夷山封育状态下的毛竹林土壤理化特性受封育年限的影响显著,封育40 a的毛竹林群落土壤肥力质量最好,正常经营的毛竹林群落土壤肥力质量最差,土壤肥力质量随封育年限的增加而提高.

The physical and chemical properties of different soil layers of Phyllostachys edulis enclosed mixed forests were analyzed and evaluated, and the enclosure durations of the mixed forests were 0, 3, 5, 10, 15 and 40 years, respectively. The results indicated that the soil density decreased with the enclosure years, and there was no significant difference in non-capillary porosity among different enclosure years(P>0.05). With the increase of enclosure year, water content, capillary porosity, organic matter, available nitrogen, available phosphorus and available potassium in different soil layers increased gradually, while soil pH and total potassium content did not change significantly, with organic matter content peaking(61.92 g·kg^(-1)) at 40 years of enclosure. The soil fertility of P. edulis forests increased successively with enclosure years. To summarize, the physical and chemical properties of P. edulis forest soils in Wuyishan were significantly affected by enclosure year;P. edulis forest with 40 years of enclosure had the best soil fertility while those under regular management had the worst quality. Generally, soil fertility was improved with the increase of enclosure years.