濒危植物景宁木兰分布特征及其与生境土壤性质的关联分析

Distribution Characteristics of the Endangered Plant Magnoliasinostellata and its Correlation Analysis with Habitat Soil Properties

以位于浙南山区的丽水市莲都区峰源乡为研究地点,调查濒危植物景宁木兰(Magnolia sinostellata)的种群分布情况,采集生境土壤样品测定理化指标,并采用灰色关联分析法探讨土壤性质对景宁木兰分布特征的影响。结果表明:景宁木兰主要分布在公益林,萌生能力极强,但大部分植株的每丛萌条数量不多;分布区生境土壤pH均值4.96,含水率极低,有机质丰富,有效磷明显不足,上层植被不是影响居群间土壤性质差异的唯一因素;关联分析显示,景宁木兰的分布情况和生境土壤的pH值、有效磷和速效钾3个理化指标关联密切,其中pH值的影响程度最高,与景宁木兰植株数关联度最大的是中土层有效磷含量,与平均每丛萌条数关联度最大的是表土层pH值。

In this research,the population distribution of Magnolia sinostellata was studied in Fengyuan Township,Liandu District,Lishui City,southern Zhejiang Province.Soil samples were collected to determine physicochemical properties,and the effects of soil properties on the distribution of Magnolia sinostellata were studied by grey correlation analysis.The results showed that Magnolia sinostellata was mainly distributed in public welfare forests,the germination ability was very strong,but most of the plants had a small number of sprouts per cluster.The mean habitat soil pH value was 4.96,the moisture content was very low,the organic matter was rich,and the available phosphorus was significantly insufficient.The upper vegetation wasn’t the only factor affecting soil property differences among populations.Correlation analysis showed that the distribution of Magnolia sinostellata was closely related to soil pH value,available phosphorus and rapidly available potassium.Among them,pH value had the highest correlation.The content of available phosphorus in the middle soil layer was the most correlated with the number of plants(clusters)of Magnolia sinostellata,and the pH value in the topsoil layer was the most correlated with the average number of sprouts per cluster.