炼山对阔叶次生林树种组成及其生长的影响

Effects of Controlled Burning on the Species Composition and Growth of Broad- leaved Secondary Forests

采用对比法,对马尾松阔叶树混交林采伐迹地进行炼山与不炼山天然更新试验。结果表明,不同林地清理方式对阔叶次生林的树种组成和林下植被种类影响较大,对阔叶次生林林木生长有一定影响。其中,炼山林地有11科26种425株林木,不炼山林地有12科38种377株;炼山林分林下植被共有79种,不炼山林分林下植被共有110种;炼山林分的平均胸径、平均树高和林分蓄积量都比不炼山的林分高。可见炼山对林木生长有促进作用。

In this paper natural regeneration experiments were carried out on cut-over lands of Pinus massoniana and broad-leaved mixed forests with and withour controlled burning. The results showed that different forest ground clearances had significant effects on the species composition and undergrowth vegetation of broad-leaved secondary forests and had some effects the tree growth. The forest ground cleared with controlled burning had 425 trees belonging to 26 species in 11 families while the ground without controlled burning had 377 trees belonging to 38 species in 12 families; The undergrowth vegetation in the stands with controlled burning had 79 species while that in the stands without controlled burning had 110 species; The mean DBH, height and volume of the stands with controlled burning were higher than those of the stands without controlled burning, indicating that controlled burning had promoting effects on the growth of forest trees.