5种楠属植物的叶片形态特征及其金属元素含量的比较

以白楠、紫楠、桢楠、浙江楠、闽楠5种楠属植物叶片为研究对象，通过观察其外观形态特征和表皮细胞结构，分别测定其叶面积、滞尘液的pH值和EC值及重金属元素Fe、Cu、Pb、Cr、Cd含量等指标, 综合评定5种楠属植物滞尘能力的大小。结果表明：5种楠属植物叶片上表面均无毛，下表面有短柔毛或长柔毛；其叶片表皮细胞大小不一，白楠最大，桢楠最小；叶片面积紫楠最大，桢楠最小；pH值紫楠最大，闽楠最小；EC值桢楠最大，紫楠最小；各重金属元素含量均存在显著性差异。初步判定其滞尘能力由大到小依次为：桢楠>浙江楠>白楠>紫楠>闽楠。

Leaf Morphological Characteristics and Metal Element Contents of 5 Species of Phoebe

The leaf appearance of Phoebe neurantha, P.sheareri, P.zhennan, P.chekiangensis and P.bournei was observed. Morphological characteristics and epidermal cell structure, and their leaf area, pH value and EC value of dust-retaining fluid, and Fe, Cu, Pb, Cr and Cd contents of heavy metal elements were measured to comprehensively assess the dust-retention abilities of the 5 species Phoebe. Results show that the leaves of the 5 species of Phoebe are hairless, and the lower surface is pubescent or villous. Its leaf epidermal cells vary in size, P.neurantha is the largest, and P.zhennan is the smallest. The leaf area of P.sheareri is the largest, and P.zhennan is the smallest. The pH value of P.sheareri is the largest, and the minimum value of P.bournei. EC value is the largest in P.zhennan, the smallest in P.sheareri. There are significant differences in the content of heavy metals. It is preliminarily determined that the dust retention capacity is from large to small as P.zhennan > P.chekiangensis > P.neurantha > P.sheareri> P.bournei.