马尾松人工林林隙内土壤理化性质变化分析

Change in Soil Physical and Chemical Properties of forest gap in Pinus massoniana Plantation

摘要:

摘要：为了了解马尾松人工林林隙内土壤的空间异质性，比较了不同年龄及不同大小林隙内土壤理化性质的差异，为人工林的可持续经营提供理论基础。结果表明：随着土壤深度增加，不同林隙内土壤除全K外，都体现出了明显的表聚性；随着林隙年龄的增加，林地土壤的pH值由于硝化作用增强而呈现下降的趋势，有机质含量表现为增加的趋势是因为林隙内草本植物的增加，土壤中N，P，K的变化比较复杂，总P与水解性氮含量也表现为增长的趋势；林隙大小对土壤有机质及养分元素并没有显著影响，pH值随林隙面积的减小呈现下降趋势；土壤容重随林隙年龄的增长而逐渐降低，而土壤孔隙度则表现为相反的趋势，饱和持水量和毛管持水量随着林隙年龄的增加，表现为明显增加的趋势。

Abstract:

Abstract: The authors analyzed the soil physical and chemical properties among gaps of different size and age in order to understand the spatial variability of soil in forest gaps of Pinus massoniana Lamb.plantation and provided the theoretic basis for forest sustainable management. The results showed that with the increasing of soil depth, the soil in different gaps appeared obvious accumulation in the surface layers except total K. With the increasing of forest gap age, the soil pH decreased because of improvement on nitrification and the soil organic matters increased due to increasing of vegetation composition. N,P,K in soil is complex. Different size forest gaps had no significant effects on organic matters and N ,P,K contents, but not pH. With the increasing of gap age, the soil bulk density and porosity shows opposite trend. The saturation moisture capacity and capillary moisture capacity obviously increased.