桂林毛村石灰土和红壤元素生物地球化学特征研究

以桂林毛村作为研究对象,对石灰土和红壤背景条件下的植物根区土的元素全量、微量元素有效态含量、pH值、有机质、全钙含量进行对比分析。结果表明:由于石灰土的全钙含量较高并为红壤的3倍多,土壤pH值比红壤的高2.16个单位,尽管石灰土K、N a、B、M o和I含量比红壤的相应元素含量低,但石灰土其它元素的含量都比红壤的相应元素的含量高;植物体的大量元素,除K元素之外,生长在石灰土上的植物体内的元素含量都比生长在红壤上的高,至于微量元素,除了Cu、M o,生长在石灰土上的植物体含量较高之外,其它元素含量均是生长在石灰土上的植物比红壤上的低;石灰土的微量元素有效态的含量一般都比红壤的低,石灰土的pH值与微量元素有效态含量则主要呈负相关(负相关比例为62.5%),红壤的pH值与土壤微量元素有效态含量的关系以正相关为主(正相关比例为62.5%);所以由于石灰土的偏碱富钙制约了微量元素的有效态含量,导致石灰土的微量元素有效态含量偏低。

The Comparative Study of Biogeochemistry between Limestone Soil and Red Soil in Maocun, Guilin

We have compared and analyzed the total elements,available elements,the pH value and organic compounds of rhizospheric soil between limestone soil and red soil.The results are as follows.It was found that the total Ca content of limestone soil is three times larger than the red soil.The pH value of limestone soil was higher than red soil,which is higher about 2.16 units.The total contents of elements in the limestone were higher than the red soil except K,Na,B,Mo and I.As to the elements contents of plants,it was found that the plants living in limestone soil had higher element content than the plants living in red soil,but the content of K of plants from limestone was lower.However,the contents of trace elements in plants living in the red soil except Cu and Mo were much higher.By analyzing the available element contents of rhizospheric soil,it was found that the available contents of trace elements in limestone soil were much lower than in red soil.And the element available content of red soil had positive correration with the pH value,which was about 62.5%.But the element available content of limestone soil had an opposite relation and the organic compounds had positive correration with trace available content of rhizospheric soil of elements.So that the character of limestone abundant in Ca restricts the available content of trace elements.