基于ICP-AES的濒危植物长序榆的元素分布及其与土壤因子的关系

A Study on Element Distribution of Endangered Plants Ulmus elongata and Its Relationship with Soil Factors Based on ICP-AES

采用ICP-AES法测定了九龙山自然保护区(JL1,JL2,JL3)3个代表性样地长序榆根、茎、皮、叶内的金属元素含量,并与土壤中对应的金属元素含量及肥力因素进行了相关性研究。结果表明:(1)大部分金属元素虽然在群落间存在一定的差异,但差异没有达到显著水平;Mn元素在群落之间却存在显著差异。(2)长序榆不同器官元素含量存在一定差异,各元素在不同器官中的变化趋势和变异程度呈现不一致现象。(3)长序榆植物体内11中元素中,两两之间存在极显著的正相关有Mg,Mn和Mo 3种元素;Fe和Cr之间、Sb和Mn,Cr之间、Ca和Th均存在极显著的正相关;其他元素之间存在一定的相关性。Ca和Th均有很大的富集系数,且两者之间存在极显著的正相关,说明长序榆对Ca和Th的吸收具有特殊性。(4)Mg和Mn这两种元素相对于植物体内的其他元素和土壤各元素间相关性显著;长序榆植物体元素含量与土壤中的肥力因素的相互关系并无明显一致的规律,说明不同群落内长序榆元素含量的差异并不是主要由土壤中肥力因素决定的,而是其它生境因子综合影响的结果。

Ulmus elongata, an endemic species in China, has being one of the grade Ⅱ national key conservation rare and endangered plants. Based on the investigation, JL1, JL2 and JL3 three sampling plots were established. To well understand the element distribution of Ulmus elongata and its relationship with soil factors in those three communities, eleven metal elements of root, stem, skin and leaf of Ulmus elongata samples were measured by ICP-AES. The results showed： （1） Element contents among different communities were different. There was significant difference of the content of Mn among different communities, but the differences of the most of elements were not significant （ P 〉0.05）. （2） The content of elements among different organs were obvious different, and its change tendency and variation degree were disaccord. （3） In plants of Ulmus elongata, significant positive correlations existed between each pair of Mg,Mn and Mo. Fe had significantly positive correlation with Cr; Sb had significantly positive correlation with Mn and Cr, as well as Ca and Th. Meanwhile, there were certain Correlations between other elements of Ulmus elongata. The enrichment coefficients of metal element such as Ca and Th were much larger than others, which indicated that absorption Of Ca and Th by Ulmus elongata was of a certain peculiarity. （4） The correlation between plant metal elements Mg, Mn and soil metal elements were significant. However, there had no evident law of interrelationship between metal elements of Ulmus elongata and soil fertility factors, indicating the variation of the element content in different communities was not dominated by the soil fertility factors, but other habitat conditions. Results from the experiment also showed that the effect of microelement should not be ignored in the growth and development process of Ulmus elongata, which was worth made thorough survey and study.