人工林伐区人力担筒集材对土壤理化性质的影响

Effect of skidding by manpower on physical and chemical properties of trail soil of artificial forest

对杉木和马尾松混交人工林伐区人力担筒集材作业前后林地集材道土壤理化性质变化进行研究.结果表明:集材后除土壤容重和结构体破坏率增大外,其余土壤理化性质指标均下降,而且表层土壤(0-20 cm)所受影响较底层土壤(20-40 cm)大;集材作业导致表层土壤容重增大0.08 g.cm-3,土壤结构体破坏率提高1.20%,最大持水量下降8.85%,总孔隙度减小4.39%;表层土壤有机质、全氮、水解性氮、全磷、速效磷、全钾、速效钾的质量分数分别下降3.62 g.kg-1、0.26 g.kg-1、36.70 mg.kg-1、0.11 g.kg-1、3.33 mg.kg-1、1.31 g.kg-1、0.59 mg.kg-1.

Effect of skidding by manpower on the physical and chemical properties of soil in artificial mixed forest of Cunninghamia lanceolata and Pinus massoniana was investigated. The results showed the volume weight of soil and the damage rate of soil structure increased. Surface soil （0 -20 cm） was impacted more seriously than bottom soil （20 -40 cm）. The bulk density of surface soil and the damage rate of surface soil structure increased 0.08 g · cm^-3 and 1.20% respectively, the saturated water retention and the total porosity of top soil decreased 8.85 % and 4.39% respectively. The contents of main nutrients in top soil, such as organic matter, total N, hydrolytic N, total P, available P, total K and available K, reduced 3.62 g ·kg^-1 , 0.26 g ·kg^-1 , 36.70 mg·kg^-1 , 0.11 g·kg^-1, 3.33 mg·kg^-1, 1.31 g ·kg^-1 and 0.59 mg ·kg^-1 respectively. Besides, the reasons of change of these physical and chemical properties of soil caused by operation of skidding were analyzed. Some technological measures for reducing the damage of skidding by manpower on the soil were put forward from the perspective of ecological harvesting operation.