摘要
报道了鼎湖山南亚热带常绿阔叶林各层次植物和表层土壤(0～20 cm)四个微量元素(Cu、Fe、Mn和 Zn)的含量和分配格局。结果表明:(1)土壤有效Cu、Fe、Mn和Zn含量(mg／kg)平均值依次为0．72、140．85、 1．42和1．92;(2)所有植物叶片Cu、Fe、Mn和Zn元素含量(mg／kg)分别介于6．1～100．6、6．5～1027．5、46．3 ～1196．7和27．0～338．6,其中乔木层植物叶片微量元素含量(mg／kg)平均值表现为Mn(305．3)>Fe (259．3)>Zn(109．9)>Cu(19．3),而其它植物表现为Fe(586．4)>Mn(336．9)>Zn(141．4)>Cu(36．6);(3) 植物微量元素在各器官的分配格局随元素和植物所在的层次不同而异:乔木层植物Cu含量高低排序为干> 根>枝>叶>皮,Fe为根>皮>叶>枝>干;Mn为叶>皮>枝>根>干;Zn为叶>根>枝>皮>干;(4)在 群落垂直结构上,Fe元素含量表现为自上而下递增的趋势,而Cu、Mn和Zn含量规律不明显;(5)植物和土壤 的微量元素与微量元素间相关性均较差;(6)与亚热带其它森林相比,鼎湖山季风常绿阔叶林土壤Cu、Mn和 Zn含量较低,但乔木层植物因具有很强的吸收或富集能力而含量较高。
The distributiorl pattern of concentration of minor nutrient element in plants and the upper soil（0～20 cm）layer in a Dinghushan lower subtropical evergreen broad-leaved forest was presented in this paper. Mean soil concentrations of available Cu,Fe, Mn and Zn（mg/kg） were.. 0. 72 ,1. 42 ,1. 92 and 140. 85, respectively. The ranges of concentrations in leaves for all plants（mg/kg） were：Cu 6.1～100.6,Fe 6.5～1 027.5, Mn 46.3～1 196.7 and Zn 27.0～338.6,with means of 19.3,259.3,305.3 and 109.9 mg/kg for plants at tree layers,and 36.6,586.4,336.9 and 141.4 mg/kg for the other plants,respectively. Concentration of minor nutrient element in organs varied depending on elements and layers. For example, the patterns for tree layer were. stems〉 root〉 branches 〉 leaves〉 barks （Cu）, root〉 barks〉 leaves〉 branches〉 stems （Fe）; leaves〉 barks〉 branches〉root〉 stems （Mn） and leaves〉 root〉 branches〉 bark〉 stems （Zn）. The concentrations of Fe were found decreasing with increasing layer（Tree〈Shrub〈Herb）, but no such order was found for other elements. There was no significant correlation in element concentrations between plant and soil, and between elements in the studied forest. The concentrations of Cu, Mn and Zn in our study forest were lower in the upper soil, but higher in the leaves of plants at the tree layers relative to those in other subtropical forests, suggesting that the plants in the studied forest had higher ability to accumulate minor element.
出处
《广西植物》
CAS
CSCD
北大核心
2005年第6期504-510,共7页
Guihaia
基金
国家自然科学基金项目(30270283)中国科学院知识创新工程领域前沿项目中国科学院华南植物研究所所长基金项目广东省自然科学基金项目(021524)~~
关键词
南亚热带常绿阔叶林
微量元素含量
分配格局
鼎湖山
lower subtropical evergreen broad-leaved forest
concentration of minor nutrient element
distri-bution pattern
Dinghushan
