甘肃主要农业土壤中Cu、Zn、Mn、Fe的形态及有效性研究

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

本文对甘肃省主要农业土壤中Ｃｎ、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Ｚｎ为７３－７４ｍｇ／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，Ｃｎ、Ｚｎ、Ｍｎ、Ｆｅ的交换态和松结有机态对植物最为有效，以松结有机态的作用最大。

In this work, the forms and availability of Cn, Zn, Mn and Fe of principal agri-cultural soils in Gansu Province were studied. The results showed that the contentsof 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 tlie four soil types testedthe contents of Cu, Zn, Mn and Fe were the lowest in irrigated desert soil but theLighest in cinnamon soil. Most of Cu, Zn, Mn and Fe in the soil occur in residualmineral form and bound to iron oxide (amorphous and crystalline). Both biologicalexperiment and statistical analysis pointed that the exchangeable form and the formloosly bound to organic matter were the most available forms of Cu, Zn, Mn and Fefor plants.