【摘要】 四川农业土壤锌水平较低,变幅为22～90.7ppm,平均70.36ppm。全锌中84～96%为残余态。能以“有效态”的形式被提取的主要为代换态、有机结合态和氧化物结合态。除酸性土外,中性和钙质土的三种形态锌只占土壤锌的极少部分(1.09～3.09%)。施锌10ppm后,中性和钙质土36～90%转变为碳酸盐结合态和残余态;酸性土则50%以上以代换态、有机结合和氧化物结合态的形式存在。土壤中代换态、有机结合态和氧化物结合态锌含量以及施入锌转变成此三种形态锌的比例与土壤pH和CaCO3含量呈显著或极显著负相关,与有机质含量和CEC呈显著或极显著正相关。更多还原

【Abstract】 The zinc contents of purple soils in Sichuan range from 22 to 90.7 ppm, averaging 70.36 ppm. RES-Zn accounts for 84-96% of the total soil zinc. EXC-Zn, OM-Zn and R₂O₃-Zn in soils are the main zinc components which are extractable and available to plants, but their contents in neutral and calcareous soils are very low, usually ranging from 1.09 to 3.09 percent of the soil-Zn. 36-90% of water-soluble Zn are transformed into CA-Zn and RES-Zn in the neutral and calcareous soils after application of 10ppm Zn, while more than 50% of watersolbule Zn in acidic soils exist as EXC-Zn, OM-Zn and R₂O₃-Zn. The contents of EXC-Zn, OM-Zn and R₂O₃-Zn in the soils and the ratioes of transforma-tion of added Zn into the above three forms were negatively correlated with the pH and CaCO₃ in the soils, and positively correlated with CEC and organic matter in the soils.更多还原