热带山桂花、西南桦人工幼林植物区系成分分析

通过调查统计,在11年生和8年生山桂花和西南桦纯林、11年生山桂花与西南桦混交林、山地雨林和季风常绿阔叶林内,分别发现种子植物113、106、75、74种和58种,分别隶属于52、52、43、40和28科。这些科中,有15科为5种林分的共有科,分别占各林分类型总科的28.8%、28.8%、34.9%、37.5%和53.6%,其中热带成分共10科,占共有科的66.7%。属的分布区类型和变型共19类,除中国特有在山桂花纯林中缺失外,天然林中的所有分布区类型在3种人工林内均有发现;热带成分分别占山桂花、西南桦纯林、山桂花与西南桦混交林、山地雨林和季风常绿阔叶林的总分布区类型(世界广布型不参与计算)的85.72%、83.11%、80.01%、86.90%和84.77%。说明山桂花、西南桦人工林具有良好的物种和区系多样性恢复的功能。可初步推断乡土树种山桂花、西南桦人工林在热带可实现可持续经营。

Study on floral rehabilitation of Paramichelia baillonii and Betula alnoides plantations

There were 113,106,75,74 and 58 seed species,which belong to 52,52,43,40 and 28 families in 11-year-old pure Paramichelia baillonii plantation,8-year-old pure Betula alnoides plantation,11-year-old mixed P.baillonii and B.alnoides plantation,original mountane rain forest and monsoon evergreen broad-leaved forest,respectively.There were 15 common families,which are 28.8,28.8,34.9,37.5 and 53.6 percent of total family in each forest stand,respectively.The 10 families,i.e.,66.7 percent,are tropical distributing types in 15 common families.There were 19 areal and sub-areal-types of genera in the forests.Except areal-type of Endemic to China,which was absent in pure P.baillonii plantation,all areal-types of genera and species were found in 3 plantations.The composition(Widespread did not included)of tropical distributing areal-types were 85.72,83.11,80.01,86.90,84.77 percent on genera,respectively,in pure P.baillonii plantation,pure B.alnoides plantation,mixed P.baillonii and B.alnoides plantation,original mountane rain forest and monsoon evergreen broad-leaved forest.The results of this study showed that there are effective capacities of restoring biodiversity for flora and areal-type in P.baillonii and B.alnoides plantations.It should be also deduced that woodlands of these two native tree species could be achieved sustainable management.