基于物种多样性和空间格局的林分稀疏

生态学杂志

基于物种多样性和空间格局的林分稀疏

龙成^1,2,杨小波^2,3**,龙文兴^2,3,李东海^2,3

（¹海南大学环境与植物保护学院，海口 570228； ^2海南大学热带作物种质资源保护与开发利用教育部重点实验室， 海口 570228； ^3海南大学园艺园林学院，海口 570228）

出版日期:2015-02-07 发布日期:2015-02-07

Stand thinning based on species diversity and spatial patterns.

LONG Cheng^1,2, YANG Xiao-bo^2,3**, LONG Wen-xing^2,3, LI Dong-hai^2,3

(¹College of Environment and Plant Protection, Hainan University,Haikou 570228, China; ²Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources, Ministry of Education, Hainan University, Haikou 570228, China; ³College of Horticulture and Landscapes, Hainan University, Haikou 570228, China)

Online:2015-02-07 Published:2015-02-07

摘要/Abstract

摘要：

为了解影响热带天然次生林稀疏的因素，本研究应用地上生物量模型、多样性指数和Oring统计对固定样地中植物的地上生物量、物种多样性和空间分布格局进行定量研究，并结合Yoda自疏模型计算林分稀疏指数，分析物种多样性与空间格局对林分稀疏的影响。结果表明：林分地上生物量随着林分密度的减小呈现先增大，后减小，再增大的趋势，在径级Ⅲ或径级Ⅳ处，出现变化拐点，在天然林管理时应加以注意。多样性指数与林分稀疏指数总体上无显著的相关性，但中等多样性指数值却对应最大的稀疏指数。说明物种多样性中等情况下，林分稀疏最为强烈。植物个体聚集分布的最大强度与稀疏指数呈显著线性负相关，二者的回归方程为：α=-1.7873O₁₁(r)_max+2.3451（R²=0.798，P=0.003）。结果表明，在热带常绿季雨矮林中，过大的聚集强度不但不能促进稀疏过程的进行，反而会对其产生阻碍作用。

关键词: 生态过程, 空间大小, 空间方向, 空间连通性, 营养级联效应, 空间布局, 空间形状

Abstract:

In order to understand the factors influencing stand thinning in tropical natural secondary forests, aboveground biomass, species diversity and spatial patterns were quantitatively analyzed by using aboveground biomass model, diversity index and O ring statistics. Moreover, the effects of species diversity and spatial patterns on stand thinning were studied with thinning index calculated by Yoda selfthinning model. The results showed that stand aboveground biomass increased first, then decreased and increased finally with declining stand density. An inflection point of aboveground biomass change occurred at diameter class Ⅲ or Ⅳ, and this should be paid attention to during forest management. In general, there was no significant correlation between diversity index and stand thinning index. However, the medium value of species diversity index corresponded to the largest thinning index, suggesting that stand thinning was strongest with the medium species diversity. A significant negative linear correlation existed between largest aggregation intensity and thinning index as follows: α=-1.7873O₁₁(r)_max+2.3451 (R²=0.798, P=0.003). The results indicated that if plant population assembled excessively, stand thinning would be suppressed rather than promoted in the tropical evergreen monsoon elfin forest.

Key words: spatial size, spatial shape, spatial distribution, trophic interaction, ecological process, spatial connectivity, spatial orientation

龙成1,2,杨小波2,3**,龙文兴2,3,李东海2,3. 基于物种多样性和空间格局的林分稀疏[J]. 生态学杂志.

LONG Cheng1,2, YANG Xiao-bo2,3**, LONG Wen-xing2,3, LI Dong-hai2,3. Stand thinning based on species diversity and spatial patterns.[J]. cje.

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