雷州附城镇无瓣海桑林天然更新格局及其影响因子的灰色关联分析

以红树林植物无瓣海桑(Sonneratia apetala)为研究对象,运用负二项参数、Cassie指标、平均拥挤度、聚块性指标和丛生指标的方法,研究广东省湛江市雷州附城镇无瓣海桑林天然更新格局,同时运用灰色关联理论对无瓣海桑林天然更新的影响因子进行分析.结果表明:无瓣海桑林天然更新格局呈聚集分布,能与红树林乡土树种共存;枝插泥深度、林分郁闭度对无瓣海桑群落天然更新影响较大,关联度分别达0.714、0.539;林龄关联度最小,为0.434,对天然更新影响最小.

Apetala Natural Regeneration Pattern and Gray Correlation Analysis of Influencing Factors in Leizhou Fucheng Town

In this paper with Sonneratia apetalaas the research object, the use of negative binomial parameters, Cassie index, average crowded degree, get together piece of sexual index, index of a method, theSonneratia Apetala natural regeneration is distribution pattern, and at the same time, the gray system theory to the Sonneratia Apetala community without the influence of natural regeneration factors are analyzed. The results show that: Sonneratia Apetala communities of natural regeneration in aggregate distribution pattern, with some native species can develop and produce positive role coexist; Crown density, average height, a number of things seedling competition Sonneratia Apetala of natural regeneration impact to the correlation degree respectively 0.952, 0.943, 0.915; Main competition kind of number, plantation age correlation were 0.757, 0.867, and natural regeneration of the minimum degree of natural regeneration affect the minimum. The research significance of coastal ecological afforestation and mangrove for recovery and development to provide scientific theory, makeSonneratia Apetala better use and social fields, the mangrove ecosystem protection and management also has certain significance.