东江水源涵养林不同混交组合林下植物多样性研究

为揭示东江水源涵养林5 年生8种不同混交组合林下植物多样性的差异及其规律。对8种不同混交组合林分样地开展植物多样性调查,对每种混交组合林下的灌木、藤本、草本层进行植物多样性评价。结果表明,林下植物丰富度指数均不高,Simpson指数与种间相遇机率(PIE) 在数值上相等,但其与Shannon-Wiener指数间则相差较大;从林下植物多样性指标的聚类分析看,混交组合楠木×锥栗、红苞木×枫香、火力楠×红锥、椆木×红锥、格木×海南红豆的植物多样性指数较高,而混交组合红锥×枫香的植物多样性指数较低。

Undergrowth Plant Diversity of Different Mixed Combinations inWater-Conserved Plantations of Dongjiang

In order to reveal the difference and regularity of plant diversity under 8 different mixed combinationsof 5-year-old water-conserved plantation in Dongjiang, the plant diversity survey was conducted,and the shrub, vine, and herb layers were evaluated for plant diversity. The results showed that the richnessindexes of the species were not very favorable, values of the Simpson′s Index were equal to the interspecificencounter probability (PIE) but differed dramatically from Shannon-Wiener index. The clusteranalysis of undergrowth plant diversity indicators showed that Phoebe nanma×Cyclobalanopsis chinensis,Rhodoleia championii × Liquidambar formosana, Michelia macclurei × Castanopsis hystrix, Lithocarpusthalassica×Castanopsis hystrix, Erythrophloeum fordii×Ormosia pinnata were the ideal types with higherdiversity, but the Castanopsis hystrix×Liquidambar formosana was the lowest one.