秭归飞播油松林的物种多样性

Species diversity of Pinus tabulaeformis forest sown by plane in Zigui County

通过对湖北省秭归县飞播油松林的野外调查，研究报道了该群落的物种多样性状况。结果表明，飞播油松林改变了当地原生植被状况，群落的植物种类比飞播地原生植被油芒草丛有较大增加，群落的植物组成也有较大变化，丰富了群落的物种多样性。但由于飞播油松林的乔木层种类单一，虽然群落的种类和个体数比当地的栎、大叶杨林多，其Ｓｈａｎｎｏｎ指数仍小于后者。油松林的物种多样性在不同地段的表现与该地段油松的株数及生长状况有关，而这些又决定于飞籽密度及坡向、坡度等小生境因素。文章最后还对保护和利用飞播油松林提出了一些建议。

According to the investigation on Pinus tabulaeformis forest in Zigui County, species diversity of the forest was studied. Result showed that the number of species in Pinus tabulaeformis forest increased 67.5% contrast to grassland, the primordial vegetation, and that species diversity became richer than grassland. The Shannon diversity index of the forest reached 3.0379. But because species in arborous layer was monotonous, its Shannon diversity index was less than nearby broad leaf forest. Species diversity on various quadrats was related to the number of Pinus tabulaeformis and its growth, which depended on sowed density of seeds, slope direction, slope degree and so on. The relationship between species diversity and habitat was also discussed in this paper.