甘肃主要农业土壤中Cu、Zn、Mn、Fe的形态及有效性研究

本文对甘肃省主要农业土壤中Ｃｕ、Ｚｎ、Ｍｎ、Ｆｅ的形态及其有效性进行了研究。结果表明，供试土壤的全Ｃｕ含量范围为２２－２４ｍｇ／ｋｇ，全Ｍｎ为５４２－７７２ｍｇ／ｋｇ，全Ｆｅ为３５６８５－３８３５５ｍｇ／ｋｇ。四种元素均以灌漠土的含量最低，褐土最高。土壤中Ｃｕ、Ｚｎ、Ｍｎ、Ｆｅ的大部分以残留矿物态和氧化铁结合态存在。生物试验和统计分析表明，Ｃｕ、Ｚｎ、Ｍｎ、Ｆｅ的交换态和松结有机态对植物最为有效，

STUDY ON FORMS AND AVAILABILITY OF Cu, Zn, Mn AND Fe OF PRINCIPAL AGRICULTURAL SOILS IN GANSU PROViNCE

In this work,the forms and availability of Cu,Zn,Mn and Fe of principal agricultural soils in Gansu Province were studied.The results showed that the contents of Cu,Zn,Mn and Fe in the experimental soils were 22-24mg/kg,73-74mg/kg,542-772mg/kg and 25685-38355mg/kg respectively.Of the four soil types tested the contents of Cu,Zn,Mn and Fe were the lowest in irrigated desert soil but the highest in cinnamon soil.Most of Cu,Zn,Mn and Fe in the soil occur in residual mineral form and bound to iron oxide (amorphous and crystalline).Both biological experiment and statistical analysis pointed that the exchangeable form and the form loosly bound to organic matter were the most available forms of Cu,Zn,Mn and Fe for plants.