肇庆九龙湖水源涵养林黑桫椤群落主要种群生态位研究

Study on the Niches of Main Species of Gymnosphaera podophylla Community at Jiulong Lake Water-conservation Forest in Zhaoqing City

以肇庆九龙湖水源涵养林黑桫椤群落的代表样地调查资料为基础,研究九龙湖水源涵养林黑桫椤群落20个物种的生态位特征。结果表明:黑桫椤群落主要物种的生态位宽度值大小依次为九节、假鹰爪、野山姜、鼎湖血桐、楼梯草、黑桫椤、金毛狗蕨、山篓、锡叶藤、铁线蕨、华南胡椒、新月蕨、水桐木、鸡血藤、柏拉木、大节茶、牛栓藤、广东润楠、粉单竹和山杜英;黑桫椤与牛栓藤、广东润楠之间有比较大的生态位重叠,其中黑桫椤与牛栓藤之间存在着激烈的竞争,而黑桫椤与广东润楠却是相互依存、共同繁荣;物种间的生态位重叠值与它们的生态位宽度大小并没有明显的正相关,生态位宽度小的物种之间也可能存在较大的生态位重叠。

On the basis of field investigation, the niche charaeteristics of the 20 species in Gymnosphaera podophylla communities were analyzed. The resuits showed that the niche breadths of the main species in Gymnosphaem podophylla communities decreased in the following order of Psychotria rubra, Desmos chinensis , Alpinia zerumbert , Macaranga sampsoni , Elatostema benryanum , C, yrnnosphaera podophylla , Cibotium barometz , Piperomia hancei , Tetracera asiatica , Adiantum capillus-veneris , Piper austrosinense , Abacopteris aspera , Ficus fistulosa , Medicago reticulate, Blastus cochinchinensis , Sarcandra glabra , Rourea microphylla , Machilus l, kwangtungensis , Lingnania chungii , Elaeocarpus syl, vestris . Niche overlaps of Gymnosphaera podophylla with Rourea microphylla and Machilus kuangtungensis were notable, indicating that considerable competition occurred between Gymnosphaera podophyUa and Rourea microphylla, and relation between Gymnosphaera podophylla and Machilus kwangtungensis was interdependence. Niche overlaps between species were not significantly correlated with their niche breadths. Niche overlaps might be notable between two species which had lower niche breadths.