石灰性土壤在不同利用方式下FeCu的形态研究

采用连续浸提的分析方法研究了石灰性土壤在不同利用方式下铁、铜的形态组成及其与有效量之间的关系。结果表明，土壤中铁主要以ＲＥＳ—Ｆｅ和Ｒ_２Ｏ_３—Ｆｅ形态存在；铜主要以ＲＥＳ—Ｃｕ形态存在，其次是ＦＸＣ—Ｃｕ和Ｒ_２Ｏ_３—Ｃｕ。土壤中ＲＥＳ—Ｆｅ的相对含量旱地土壤高于水旱轮作土壤，而水旱轮作土壤又高于冬水田，Ｒ_２Ｏ_３—Ｆｅ、ＣＡ—Ｆｅ、ＯＭ—Ｆｅ都是旱地土壤低，冬水田最高。土壤中ＷＳ—Ｃｕ、ＥＸＣ—Ｃｕ和ＥＲＭｎ—Ｃｕ三种形态含量：冬水田相对最高，水旱轮作次之，旱地最低。有效铁与ＣＡ－Ｆｅ和Ｒ_２Ｏ_３—Ｆｅ呈显著正相关，说明冬水田供铁较充足，而旱地土壤易于缺铁。有效铜与ＥＸＣ—Ｃｕ和ＥＲＭｎ—Ｃｕ呈极显著正相关，说明冬水田供铜较充足，旱土土壤则相对偏低。

THE FORM OF Fe AND Cu CALCAREOUS SOIL UNDER DIFFERENT FARMING FORMS

Using continuous extra ction methods,the relationship between the forms of Fe、Cu and their available content of calcareous soil under different farming forms were analyzed. The result showed as the following:the main existence forms of Fe in soil were RES Fe and R2O3 Fe,and those of Cu in soil were RES Cu, the secondary was EXC Cu, and R_2O_3 Cu, The relative content of RES Cu was that in dryland water-dry rotation soil>winter-water field. R_2O_3 Fe、CA Fe、om Fe content in dryland soil was the lowest,while that in winter water field was the highest.The WS Cu、EXC Cu and ERMn Cu content was that in winter water field>water-dry rotation soil>dryland soil,Available Fe and CA Fe、R_2O_3 Fe in soil had significant positive relationship. This indicated winter-water field could provide sufficient Fe while it was up to be of Fe deficiencies in dryland soil. It was highly significant positive relationship between available Cu and EXC Cu、ERMn Cu in soil. It indicated the winter water field could provide sufficient cu, while the dryland soil provided relatively less Cu.