滇中地区地带性植被优势种及云南松元素背景值的研究

本文研究滇中地区地带性植被(半湿润常绿阔叶林)优势种和云南松的元素背景值测定了植物叶、地被枯落叶和土壤内13种元素含量。并进行相关分析,结果表明:1常量元素含量的变化范围较小。具有相对稳定性。可反映地区植物元素背景值和地球化学特征:微量元素含量的变化较大。受成土母质和周围环境的影响较大。2叶内元素含量与土壤中元素含量有一定相关性。3在植物叶内,某些元素之间呈现一定的相关性。4常绿阔叶林优势种与云南松叶内元素含量的异质性显著。5营养元素与重金属元素在植物一枯落叶—土壤系统的物质循环过程中有不同的特点。

Study on the Element Background Values of Dominant Species of Zonal Vegetation and the Forest of Pinus yunnanensis in the Cen- tral Region of Yunnan Province

This paper studied the element background values of zonal vegetation (subhumid evergreen broad-leaf forest) and the forest of Pinus yunnanensis in the central region of Yunnan Province. The content of thirteen elements in leves, litters and soils and their correlation were determined. The results: l.The content of macroelements and traceelements had different change tendency.the change range of the content of macroelements was smaller and had relative stability,so they can reflect the element bacxground values in plants and the geochemical characteristics in this region and had obviously regiceal characteristics. The change range of the content of trace elements were larger, they were effected by soil-forming rocks and circumstances around them. 2. The certain correlation existed between the content of elements in leaves and in the soil. 3. There were certain correlation between some elements in the leaves. 4. Heterogeneity between the content of elements in the leaves of P. Yunnanensis and those of the dominant species of evergreen broad-leaf forest was prominent. 5. In the process of elemen tal cycle in the plant-litter-soil system, nutrient elements were different from those of heavy metals.