3种经营措施对沙地樟子松人工林林下植被的影响

Effects of three silvicultural measures on understory vegetation in Pinus sylvestris var. mongolica plantation

文章通过对围封、卫生伐、修枝3种经营措施下,樟子松人工林林下植物群落的基本特征、植被群落组成、草本植物生物量及植物多样性进行的调查研究,结果表明,樟子松人工林林下植物群落碎化程度高;草本群落的总盖度和生物量随着围封年限的增加而增加,而草本群落的生物多样性随着围封年限的增加而降低;对40年生的樟子松人工林进行卫生伐并逐渐引导成疏林草地的措施,可增加林下植被的总盖度、主要组成种的高度和草本生物量,但草本层植物多样性指数呈显著降低;修枝对林下的草本多样性影响很小。

An experiment was conducted to study effects of three silvicultural measures, i.e. enclosure, sanitation cutting and pruning on the basic characteristics, community composition, herb biomass and plant species diversity ofundcrstory vegetation in Pinus sylves tris var. mongoliz＇a plantation. The results indicated that the plant community in understory was highly fragmented; with the increasing of enclosure time, the coverage and biomass of herb commtmity was increased, but the herb species diversity was decreased; lransfor marion of 40yearold plantation into scattered trees and grasses by sanitation cutting increased the understory coverage, the heights of main species and the herb biomass while sigrtificanfly decreased the herb species diversity index; pruning showed little impact on herb species diversity.