摘要
通过西双版纳南坡铜矿区土壤中元素的赋存形态及植物有效性试验研究发现:元素的可交换态和残余态形态比系数(KX)从大到小排列序列为:Mo、Cu、Mn、Ag、Zn、Ni、Pb、As、W、Cr。这一序列既与植物的生物吸收系数(KXS)序列也与植物的生物转移系数(KZY)序列相似,表明土壤中可交换态相对较多,残余态相对较少的元素易于被植物根系吸收和在其体内转移。元素被植物吸收特别是在其体内的转移还受到元素本身的可利用性和毒性的影响。生物转移系数大的元素通常是毒性小且是植物必需的营养微量元素,而生物转移系数小的元素通常是毒性很强的元素。
The occurrence and availability of elements in the soil from Nanpo copper area of Xishuangbanna are investigated.It is found that proportion coefficient of exchangeable and residual fraction（KX） is arranged from large to small and the arrangement sequence is Mn,Mo,Cu,Ag,Zn,Ni,Pb,As,W,Cr.This sequence is similar to the sequence of biological absorption coefficient（KXS）,and so to the sequence of biological transfer coefficient（KZY）.It shows that the elements of exchangeable fractions are higher and residuals in the soil can be easily absorbed by plant roots and transferred.The elements absorbed and transferred in plants are affected by the availability and the toxicity.In general,the elements with higher biological transfer coefficient are less toxic and are essential nutrients for plants,whereas the lower are more toxic.
出处
《桂林理工大学学报》
CAS
北大核心
2011年第4期516-523,共8页
Journal of Guilin University of Technology
基金
国家自然科学基金项目(40873030
40972220)
广西地质工程重点实验室基金项目(桂科能07109011-Z008)
