摘要
本文采用连续提取法，对岩溶区与非岩溶区农田和林地两种土地利用形式下土壤中Zn元素形态进行了分级提取。测定结果表明，土壤中Zn元素主要以残渣态（占总量68．5%～85．0％）存在。此外，岩溶区农田、林地石灰土中Zn元素相对活泼态，即离子交换态（包括水溶态）、碳酸盐结合态、腐殖酸结合态（松结有机结合态）的含量均比非岩溶区对应的要低，而相对稳定态，即铁锰氧化物结合态、强有机结合态（包括部分硫化物态）的含量均比非岩溶区相对应的要高，残渣态含量与相对稳定态具有相同的趋势。这意味着岩溶土壤地球化学环境对土壤Zn的迁移、富集、形态转换具有明显的影，向。长期耕种下岩溶区和非岩溶区土壤均会出现缺Zn状况，岩溶区情况更为严重。而适宜的土壤改良措施，可望提高土壤有效Zn形态的含量。
The speciations of Zn in soils under different land use in karst and non-karst area are analyzed by means of sequential extraction procedure, The results show that Zn is mainly in residual fraction in all soil types （accounting for 68. 5%-85.0%）; the contents of exchangeable fraction is of positive relativity with the contents of carbonate fraction and organic fraction; the contents of exchangeable, carbonate and organic fractions in calcareous soils are lower than that in red soils. This implies that the karst geochemistry strongly influences the availability and mobilization of Zn in karst environment. The soil in karst area is prone to be tack of Zn under constant cultivation.
出处
《中国岩溶》
CAS
CSCD
北大核心
2006年第4期293-296,共4页
Carsologica Sinica
基金
广西科学研究与技术开发计划项目(桂科能05112001-8A
桂科能063006-5H)
水利部水土流失综合科学考察项目(2005SBKK05)
关键词
土壤Zn
元素形态
岩溶环境
桂林毛村
Zn
Speciations of element
Sequential extraction
Karst environment
Maocun,Guilin
