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本项研究是通过生物培养、示踪研究和盆栽试验完成的。通过模拟培养试验,研究了草木樨等有机物料在苏打盐渍土中的转化产物——脂肪酸(2C—5C)及CO_2的累积规律。土壤施用有机物料后,促进了脂肪酸与CO_2的累积。脂肪酸的含量顺序为:乙酸>丙酸、丁酸>戊酸,导致了离子组成比例的变化。通过示踪研究结果表明:胡敏酸、草木樨及柠檬酸等有机物料均有促进CaCO_3活化的作用,活化能力为:柠檬酸>胡敏酸>草木樨,试验证明从CaCO_3中活化而释放的Ca~(2+)直接参与胶体的代换平衡。通过盆栽试验,研究了有机物料对土壤物理性状的影响及在改变土壤盐分类型上的作用。本文综合阐述了有机物料在改良苏打盐渍土上的机理,为苏打盐渍土改良提供理论依据。
This study was completed by bio-culture, tracer studies and pot experiments. The simulated cultivation experiments were conducted to study the accumulation of fatty acids (2C-5C) and CO 2 in organic matter such as Radix psyllium in sodic saline soil. After soil application of organic materials, the accumulation of fatty acids and CO 2 was promoted. The content of fatty acids in the order: acetic acid> propionic acid, butyric acid> valeric acid, resulting in changes in the proportion of ionic composition. The results of tracing studies showed that organic materials such as humic acid, kombucha and citric acid promoted the activation of CaCO_3, and their activation ability was: citric acid> humic acid> kusnezoffii, and the experiment proved that they were activated and released from CaCO_3 Ca ~ (2+) is directly involved in colloid substitution and balance. Pot experiments were conducted to study the effects of organic materials on soil physical properties and their roles in changing soil salinity types. This paper comprehensively expounds the mechanism of organic material on improving soda saline soils, and provides a theoretical basis for the improvement of soda saline soil.