川西周公山柳杉人工林群落的边缘效应

被引:7
作者
王德艺 [1 ,2 ]
郝建锋 [1 ]
李艳 [1 ]
齐锦秋 [1 ]
裴曾莉 [1 ]
黄雨佳 [1 ]
蒋倩 [1 ]
陈亚 [1 ]
机构
[1] 四川农业大学林学院
[2] 中国科学院植物研究所系统与进化植物学国家重点实验室
关键词
边缘效应; 柳杉人工林; 物种多样性; 群落结构; 物种组成;
D O I
暂无
中图分类号
S791.31 [柳杉];
学科分类号
090702 [森林培育];
摘要
为研究人工林群落的边缘效应特征,本文以川西周公山森林公园的柳杉(Cryptomeria fortunei)人工林破碎化大斑块为对象,以植株平均胸径、平均高度、平均密度、丰富度指数(D)和Shannon-Wiener指数(H)来综合衡量边缘效应深度。在实地踏查的基础上,从林缘向林内(梯度1至梯度5)设置5条样带(宽度为10 m),在每条样带中设置4个10 m×10 m的小样方进行调查。结果表明:(1)从物种组成上看,在总面积为2,000 m2的20个小样方中共记录到111个物种,隶属于54科96属,物种数从林缘至林内递减。(2)从群落结构上看,乔木层的平均胸径从林缘至林内呈减小趋势,平均密度则相反,平均高度无显著变化;灌木层的平均密度从林缘向林内减小,平均高度无显著变化;草本层的平均密度和平均高度均呈减小趋势。(3)从物种多样性上看,总体上各层次的丰富度指数和Shannon-Wiener指数均从林缘向林内呈减小趋势,其中灌木层和草本层的变化趋势最明显;同时,林内各梯度与梯度1(林缘)的共有种和相似性系数从林缘向林内递减。(4)分析各项群落特征发现,平均高度、平均密度和相似性系数的数值在梯度2向梯度3过渡时的起伏变化最明显,推断本研究中柳杉人工林斑块的边缘深度可达林内20 m。
引用
收藏
页码:940 / 947
页数:8
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