间伐强度和次数对侧柏人工林细根形态及生物量的影响  

Effect of Thinning Intensity and Frequency on Fine Root Morphology and Biomass for Platycladus orientalis Plantations

作　　者：陈信力[1] 刁娇娇[1] 闵建刚[1] 关庆伟[1] 李瑞霞[1] 王东[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《西南林业大学学报（自然科学）》2013年第4期5-11,16,共8页Journal of Southwest Forestry University：Natural Sciences

基　　金：国家林业公益性行业科研专项(201104075)资助

摘　　要：对不同间伐强度和间伐次数的侧柏人工林不同根序细根形态特征和细根生物量进行分析研究。结果表明:间伐措施对侧柏人工林细根生物量和不同根序细根直径、根长以及比根长产生了显著影响。其中间伐强度和间伐次数都显著改变了细根生物量;并且与对照样地相比,不同间伐强度显著改变了表层土壤5级根的直径,4、5级根的根长,3、4级根的比根长以及亚表层土壤2、4级根的比根长;而间伐次数则使亚表层土壤5级根直径、表层土壤1、2级根根长和表层土壤2、3级根的比根长产生了显著差异。The fine root morphology of different order roots and the fine root biomass of the Platycladus oriental- /s plantations treated with different thinning intensity and frequency were analyzed. The results showed that the dif- ferent thinning measures had significant impacts on fine root biomass of the plantation, and also on the diameter, length and the specific root length （SRL） of the fine root under different root orders. Both of the thinning intensity and thinning frequency had significant influence on the fine root biomass. Compared with the control plots, the thinning intensity significantly affected the mean diameter of the 5th order roots, the mean length of the 4th to 5th or- der roots and the mean SRL of 3rd to 4th order roots in surface soil layer, and the mean SRL of the 2nd to 4th order roots in the subsurface soil layer. Whereas the thinning frequency significantly influenced the mean length of the 1 st and 2^nd order roots, the mean SRL of the 2na to 3rd order roots in surface soil layer, and the mean diameter of the yh order root in the subsurface soil layer.

关 键 词：侧柏 人工林 细根形态 生物量 间伐强度 间伐次数 

分 类 号：S718.45[农业科学—林学] S782.1