下辽河平原潮棕壤不同粒级碳和氮分布研究

Distribution of C and N in different particle fractions of meadow brown soil in lower reach of Liaohe River Plain

采用具有不同开垦年限的0～20和20～40 om耕层土壤,对其不同粒级的有机碳和全N分布进行了研究.结果表明,在0～20和20～40 cm耕层,＜0.002 mm粒级的有机碳含量最高,＜0.02 mm粒级含量次之,＜0.2 mm粒级含量最少.土壤全N的粒级分布规律与有机碳基本相同.在同一粒级中,有机碳和全N的各粒级分布与开垦年限没有明显的相关性.各粒级的有机碳与全N相关性极显著,在＜0.2 mm粒级的相关系数为0.74,在＜0.02 mm和＜0.002 mm分别达到了0.94和0.91.

The study of meadow brown soil with different reclamation history in the lower reach of Liaohe River Plain showed that in 0～20 and 20～40 cm soil layers, 〈 0. 002 mm fraction had the highest content of organic carbon, followed by 〈 0.02 and 〈 0.2 mm fractions. The distribution pattern of total nitrogen was similar to that of organic carbon. There was no obvious correlation between the distribution of organic carbon and total nitrogen in different soil particle fractions and the history of reclamation, but the correlation between organic carbon and total nitrogen in different soil particle fractions was highly significant, with the correlation coefficients 0.74, 0.94 and 0.91 in fractions〈 0.2, 〈0.02 and〈0.002 mm, respectively.