西双版纳南坡铜矿区植物地球化学异常特征及形成机理

对西双版纳南坡铜矿区植物与土壤地球化学剖面研究发现:发育在Ⅰ线研究剖面山脊隐伏矿床上方和山坡脚近溪流处的Ⅰ号和Ⅱ号植物综合异常,其赋存空间、物质来源及发育状态受不同成因类型的土壤异常的控制。Ⅰ号异常反映了土壤气体异常、碎屑异常和上移水成异常;Ⅱ号异常反映了土壤侧移水成异常和部分水化学异常。由于元素在植物根际环境的地球化学赋存状态及其生物有效性,植物对元素吸收的选择性和屏障效应等因素,植物中某些异常元素同土壤异常中的相应元素具有不协调性。植物地球化学异常库和所有的地球化学异常库都发生关系,它们在一定的时空、环境和动力条件下发生一系列复杂的界面反应,使元素向植物迁移转化,导致植物地球化学异常的形成。

Characteristics and Formation Mechanism of Vegetation Geochemical Anomalies in the Nanpo Copper Ore Field,Xishuangbanna,Yunnan Province,China

No.Ⅰand No.Ⅱ vegetation geochemical anomalies at line Ⅰ in the Nanpo copper ore field of Xishuangbanna,Yunnan Province,which developed at the ridge above the hidden deposit and the slope near the stream in the study cross-section,their occurrence space,material source and developmental state are subjected to different genetic types of soil geochemical anomaly control. No.Ⅰvegetation anomaly reflects soil gas anomaly,clastic anomaly and upward hydromorphc anomaly; No.Ⅱ vegetation anomaly reflects soil lateral hydromorphc anomaly and some hydrochemical anomaly. As the geochemical forms of the elements and phytoavailability in the rhizo sphere environment,and selectivity absorbing and shielding effects of plants,some elements in the vegetation anomaly have incompatibility with some corresponding elements in the soil anomalies. Pool of vegetation geochemical anomaly and all pool of geochemical anomaly have taken place in the relationship,which occur as a series of complex interface reactions in a certain time and space,environmental and power conditions lend to the migration and transformation of elements into plants,resulting in the formation of vegetation geochemical anomalies.