抚育间伐对辽东山区人工红松林土壤物理性质及持水特性的影响

Effect of Thinning on Soil Physical Properties and Water-holding Capacity of Pinus koraiensis Plantation in Liaodong Mountain Area

通过野外调查取样和室内测试与分析,研究了不同抚育间伐强度下,人工红松林土壤物理性质及其持水特性。结果表明：与对照相比,0-20 cm土层,弱度、中度和强度抚育间伐处理的土壤密度分别减少了1.36%、17.10%、13.46%;土壤总孔隙度分别是对照的1.02、1.14、1.23倍,土壤毛管孔隙度分别是对照的1.00、1.14、1.21倍,土壤非毛管孔隙度分别是对照的1.13、1.14、1.40倍;土壤最大持水量与对照相比分别提高了0.52%、13.90%、23.18%,土壤非毛管持水量分别高出了12.79%、14.30%、39.65%;土壤饱和入渗系数分别是对照的2.81、3.45、4.99倍。〉20-40 cm土层所表现出的规律与0-20 cm土层基本一致,方差分析显示,各抚育间伐处理均能显著改善土壤的物理性质及其持水性能,且以中度及强度抚育间伐处理的效果更优。

We studied the soil physical properties and water-holding capacity of Pinus koraiensis plantation under three thinning conditions（ light,medium and heavy intensity thinning） by field survey sampling and indoor test for the reasonable thinning operation of Pinus koraiensis plantation in Liaodong Mountain Area. At the depth of 0-20 cm,the soil bulk density was decreased by 1.36%,17. 10%,13. 46%,respectively,for non-thinning. Compared with non-thinning,the soil total porosity was 1.02,1.14 and 1.23 times of that of the control. The soil capillary porosity was 1.00,1.14 and 1.21 times of that of the control,and non-capillary porosity was 1.13,1.14 and 1.40 times of that of the control,respectively. The soil maximum water-holding capacity and non-capillary water-holding capacity both were increased by 0.52%,13.90%,23. 18%and 12.79%,14.30%,39.65%,respectively. The permeability coefficients was 2.81,3.45,and 4.99 times of that of the control under three thinning conditions. At the depth of 20-40 cm,the thinning treatments had the similar changes in soil physical properties and water-holding capacity with the upper 0-20 cm soil layer. By variance analysis,the thinning significantly improved the effects of soil physical properties and water conservation,especially in medium and heavy intensity thinning.