论文部分内容阅读
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。
Soil zinc in the lower levels of agricultural soil in Sichuan, amplitude 22 ~ 90.7ppm, an average of 70.36ppm. 84 to 96% of the total zinc is the residual state. Can be extracted in the form of “effective” mainly for the substitution, organic binding and oxide binding. In addition to acid soil, the three forms of zinc in neutral and calcareous soil accounted for only a very small part of the soil zinc (1.09 ~ 3.09%). After zinc application at 10 ppm, 36-90% of neutral and calcareous soil were converted to carbonate-bound and residual forms, and over 50% of acidic soils were present in the form of substitutions, organic bonds and oxide-bound forms. The ratios of soil metathesis, organic bound and oxide bound zinc, and the ratio of applied zinc into these three forms of zinc were significantly or very significantly negatively correlated with soil pH and CaCO3 content, but significantly correlated with organic matter content and CEC Or very significant positive correlation.