长江三峡地区优势植物的化学元素含量特征

STUDIES ON THE CHARACTERISTICS OF ELEMENT CONTENTS IN THE DOMINANT PLANT SPECIES OF THE THREEGORGES REGION IN CHINA

分析了三峡地区１６种优势植物２０个元素的自然含量特征。＞１０００μｇ·ｇ－１的元素有Ｃａ、Ｋ和Ｍｇ，１００～１０００μｇ·ｇ－１的元素有Ａｌ、Ｐ、Ｓｉ、Ｆｅ、Ｓ和Ｍｎ，１０～１００μｇ·ｇ－１的元素有Ｎａ、Ｓｒ、Ｚｎ、Ｂ，＜１０μｇ·ｇ－１的元素有Ｔｉ、Ｃｕ、Ｎｉ、Ｃｒ、Ｍｏ、Ｃｄ和Ｖ。这些元素中，Ｎａ含量低于所报道的范围。元素含量特点是Ｃａ＞Ｋ型。Ｐ、Ｓ、Ｋ、Ｃａ的频数分布为正态分布，Ａｌ、Ｍｎ为对数正态分布。植物不同器官元素含量差异较大，在所研究的９种植物中，８种植物地下部分具有积累Ａｌ、Ｎａ、Ｆｅ的作用，地上部分具有积累Ｋ、Ｃａ、Ｓ的作用。不同的植物元素含量变异较大，Ａｌ、Ｍｎ、Ｆｅ、Ｍｇ、Ｎｉ、Ｓｒ变异系数较大，Ｋ、Ｓ、Ｐ、Ｃｒ、Ｃｄ及Ｃｕ变异系数＜６０％，其中Ｃｕ的最小。元素间相关分析表明，Ａｌ和Ｆｅ、Ａｌ和Ｃｒ、Ａｌ和Ｖ、Ｃｄ和Ｓｒ、Ｃｄ和Ｍｏ、Ｆｅ和Ｖ、Ｚｎ和Ｃｒ、Ｎｉ和Ｓｒ、Ｍｇ和Ｎｉ、Ｍｏ和Ｓｒ、Ｃａ和Ｓｒ、Ｃｒ和Ｍｏ、Ｎａ和Ｍｇ、Ｎａ和Ｐ、Ｐ和Ｓ、Ａｌ和Ｔｉ、Ａｌ和Ｓｉ相关极显著，Ｍｏ和Ａｌ等之间有相关关系。根据植物中２０个元素的资料，对１６种植物及２０个元素进行了分类，区分出不同植物中?

The characteristics of the contents of 20 elements (Al, Fe, Mn, Ca, Mg, K, S, Si, P, Cd, Cu, Zn, Ti, Ni, Sr, Mo, Na, B, Cr, V) in 16 plant species collected from the Three Gorges Region in China were investigated. The average contents of Ca, K and Mg were higher than 1000 μg·g-1, that of Al, P, Si, Fe, S and Mn ranged between 100～1000 μg·g-1 and Ti, Cu, Ni, Cr, Mo, Cd and V were less than 10 μg·g-1. The level of Na content was less than that of the reported. The main character of the element contents was of the Ca>K type. The contents of P, S, Ca and K in different plant samples showed a normal distribution pattern, while Al and Mn showed a elements lognormal distribution pattern. Plant species differed greatly in the element contents. On analyzing the coefficient of variation (C.V., %), Al, Mn, Mg, Ni, Sr and Fe had higher C.V., while the C.V. of K, S, P, Cr, Cd and Cu was less than 60%, and Cu had the lowest C.V. The correlations between Al and Fe, Al and Ti, Al and Cr, Al and V, Cd and Sr, Cd and Mo, Fe and V, Zn and Cr, Ni and Sr, Mg and Ni, Mo and Sr, Ca and Sr, Cr and Mo, Na and Mg, Na and P, P and S were statistically significant in different plant species. The classification of the 16 plant species and 20 elements by twoway indicator species analysis (TWINSPAN) method may suggest the difference in element contents of the different plant species. 