摘要
本文对黑龙江省南部地区两种水稻土的有机质变化动态进行了模拟试验,建立土壤有机质动态变化的数学模型。结果表明,土壤有机质与肥力特性有很好的相关性,在分析预测的基础上提出保持土壤有机质宜适值的必要性和可能性。
The fertility character, mineralization speed and equilibrium of organic matter of 'black-paddy-soil'and 'meadow-paddy-soil'in Heilongjiang Province were studied in this paper. The results indicated that the organic matter content in the two kinds of soil were positively correlated to total nitrogen, phosphorus, available nitrogen, phosphorus and BEC. The mineralization speed increased as the fertilizers increased and it was two times quicker for the organic matter to mineralize in 'meadow-paddy-soil than in 'black-paddy-soil'. Although the organic matter in 'black-paddy-soil'was stable, its content was low, so 209 kg stable organic matter per mu needed to be applied in order to reach the suitable value. The organic matter in 'meadow-paddy-soil'decomposed more quickly but its content was high, so it was unnecessary to apply any manure to keep the organic matter content more than the suitable value in 30 years.
关键词
水稻土
有机质
宜适值
矿化
paddy soil
mineralization
suitable value
