光皮桦群落邻体干扰指数的研究

In the course of studying Betula luninifera community at Weimin in Fujian Province,the interrelation between the growth rate of B. luminefera and its neighborhood interference index has been analyzed and the relation of its size,neighborhood interference index and growth rate has been found.The results show that the influence of neighborhood interference index and growth rate has been found.The results show that the influence of neighborhood interference becomes weak gradually among the investigated trees whose breast height diameter is over 10cm.So it is suggested that B. luminifera at Weiming should be forested before the breast diameter reaches 10cm.

南方林区马尾松不同套种模式群落高度级结构分析

以高度级为参考坐标,应用衡量群落结构及其动态的失稳率和群落垂直空间的分享度等指标对南方林区4个不同套种模式马尾松群落高度级结构特征及其动态进行分析.结果表明:套种模式1、套种模式2和套种模式4群落高度级内个体数量分布呈先降低后升高的U型结构,物种数量和物种个体数量在中等高度级出现低频区域,群落动态表现为高等高度级衰退趋势;套种模式3群落呈基部大、顶层小的塔形结构,物种数量和物种个体数量主要集中在低等高度级,反映出该群落具有极强的增长特性.不同套种模式群落分享度均比较低,反映出南方林区马尾松人工林群落物种数量相对单一的弊端.

贫瘠山地马尾松与深山含笑混交效果分析

马尾松与深山含笑混交,可以改变贫瘠山地造林树种单一、林分结构单一局面,对提高森林生态功能具有重要意义。造林对比试验结果表明,5马5深林分马尾松的径、高生长和单株材积增长,明显优于10马林分;5马5深林分的深山含笑径、高生长和单株材积增长,明显优于10深林分;林分的单位面积蓄积量10马林分与5马5深林分间无显著差异,均明显优于10深。3种林分之间的地表凋落物量、腐殖质含量、土壤含水率,以及水解性N、速效P、速效K含量均存在极显著差异;在抗高温能力上,5马5深>10深>10马;抗干旱能力上,10深>5马5深>10马。在坡度大的贫瘠山地,马尾松与深山含笑种间关系协调,在径、高生长上有互相促进作用,是优良混交组合。