鼎湖山南亚热带地区植物的叶片矿质元素

THE MINERAL ELEMENTS IN LEAVES OF PLANTS IN SOUTH SUBTROPICAL AREA OF MT DINGHU SHAN

本文分析了64种植物叶片中19种矿质元素的含量,讨论了不同生活型植物对矿质元素的吸收和积累的影响。研究表明:64种植物叶片的19种矿质元素的频数分布呈对数正态分布。不同植被型及生活型,子叶数及光合途径对叶片矿质元素含量和组成有显著的影响。密林植物含较多P和Mg,有较高的微量元素/大量元属比;疏林植物含较多Al和Mn;木本型植物缺Mo;草本型植物积集较多的K、Ca、Si、Mg、P和Ti。草本中的双子叶植物平均矿质元素总量高于单子叶,尤以Ca与B较为明显。单子叶中的C_4植物叶片含较多的Na。

19 kinds of mineral elements in 64 species are in a logarithmic normal distribution. The contents and composition of mineral elements depend upon the vegetation and life form, cotyledom number and phetosynthetle pathway. More P and Mg and higher ratio of micro/macro elements were found in plants of close canopy while more Al and Mn in plants of intermediate canopy. There was na Mo found in leaves of woody plants, Herbs accumulated more K, Ca, Si, Mg,P and Ti. The average content of mineral elements, especially Ga and B, was higher in herbaceous dicot than in monocot. Among moocnot species, plants having the C4 parthway required more Na than C3 plants,The potential tolerance to Al and Mn, the characteristics of content and composition of mineral elements in relation to genetype and structural components of vegetation, and the possible effect of light availability were also discussed.