摘要
西双版纳南坡铜矿区属热带气候区,植被类型为热带雨林型热带季节雨林亚型。通过对该区植物地球化学特征研究,发现植物群落总体的Cu、Ag、Pb、W、Mo、As等元素的含量,矿区均大于背景区;背景区和矿区高含量元素的植物种属分别仅占调查种属的18.42%和33.33%;有些种属中某些元素的含量在背景区和矿区都较高或都较低;有些种属在背景区某些元素含量不高,但在矿区富集;有些种属在背景区某些元素富集,但在矿区含量并不高。植物不同器官中无论是背景区还是矿区,大多数元素最为富集的是根部特别是细根,其次是叶及细枝,含量最低的是木质部及皮。选择找矿有效指示植物既要考虑高浓度的矿化元素环境对植物的胁迫造成的"被强迫吸收",也应考虑植物本身的生理生态"屏障效应"。植物地球化学衬度系数(KCD)和植物地球化学屏障系数(KPZ)可作为选择和评价找矿有效指示植物及其指示元素的指标。本区可作为找矿有效指示的植物为凤尾蕨、小叶藤黄、芒萁和长叶实蕨,有效的指示元素主要为Cu、Ag、W、As和Pb等。
Xishuangbanna Nanpo copper field is situated in tropical climate zone,its vegetation belongs to tropical seasonal rain forest subtype in tropical rain forest type.Eelement contents of Cu,Ag,Pb,W,Mo,As etc.in the plant communities in the ore field are greater than those in the background area.In the background area and other ore fields,the higher element contents of plant species hold only 18.42% and 33.33% respectively among researched species and the contents of some elements in some plant species are all higher or lower.The contents of some elements in some species are not high in the background,but enrichment in the ore field.The contents of some elements in some plant species in the background are higher,but dilution in the ore field.In the background or the ore field,elements are most rich in root,especially rootlet,then leaf,thin twig,xylem and bark in different plant organs,depending on plant forced-absorption in environment of high concentration mineral elements and plant physiology-ecological shielding effects.Phytogeochemistry contrast coefficient（KCD） and shielding coefficient（KPZ） of elements can be regarded as two indexes to select and appraise prospecting effective indicator plants.Pteris sp.,Garcinia cowa,Dicranopteris pedata and Bolbites heteroclite etc.can be regarded as prospecting effective indicator plants and Cu,Ag,W,Pb,As can be regarded as prospecting effective indicator elements.
出处
《桂林工学院学报》
CAS
北大核心
2010年第1期1-14,共14页
Journal of Guilin University of Technology
基金
国家自然科学基金资助项目(40873030
40972220)
广西地质工程重点实验室基金项目(桂科能07109011-Z008)
关键词
植物地球化学特征
找矿
有效指示植物
铜矿
南坡/西双版纳
characteristics of phytogeochemistry
prospecting
effective indicator plant
copper mine
Nanpo/Xishuangbanna
