沿海沙地引种竹子和木麻黄固沙功能比较研究

运用主成分和聚类分析法对沿海沙地10种引种竹子和木麻黄的固沙功能进行了比较研究。结果表明,所选的17个指标经主成分分析后,转化为6个独立新指标,即土壤持水性能、根系形态特征、根系单根平均抗拉强度、土壤颗粒机械组成、土壤排水能力及有机质含量。各主成分综合得分结果表明,各竹种和木麻黄10-20 cm土层固沙功能强于20-40 cm土层,其中在10-20 cm土层中以花吊丝竹、绿竹和大头典竹的固沙功能较强,而在20-40 cm土层中以麻竹、花吊丝竹、鼓节竹的固沙功能较强。聚类分析结果将10-20 cm和20-40 cm土层的各竹种和木麻黄固沙功能划分为4类。

Comparative study on sand fixation among 10 species of introduction bamboo and Casuarina equisetifolia in coastal sandy sites

Sand fixation among 10 species of introduction bamboo and Casuarina equisetifolia in coastal sandy was studied by principal component and cluster analysis.The results indicated that 17 selected indexes were transformed into 6 new independent indices which were soil water retention,root morphological characters,mechanical properties of roots,mechanical composition of soil particles,drainage capacity and organic matter content by principal component analysis.Furthermore,sand fixation functions in 10-20 cm soil layer were basically stronger than that in 20-40 cm.In 10-20 cm soil layer,the strongest function of sand fixation was possessed by Dendrocalamus minor var.amoenus,followed by Dendrocalamopsis oldhami and Dendrocalamopsis beecheyana var.pubescens.While in 20-40 cm soil layer,the strongest function of sand fixation was possessed by Dendrocalamus latiflorus,followed by Dendrocalamus minor var.amoenus and Bambusa tuldoides 'Swolleninternode'.Based on the result of cluster analysis,the functions of sand fixation could be divided into 4 categories.