施用有机物料对潮土及其微团聚体性能的影响——Ⅱ.对微团聚体阳离子代换量和铵吸持能力的影响

The Effectof Organic Materials on Microaggregate in Alluvial Soils Ⅱ. The Effect on CEC and NH_4^+ Absorbability on Mieroaggregate

在3种潮土中加入5%的麦秸、猪粪和马粪进行盆钵培养,结果表明:施用有机料的初期,土壤的阳离子代换量下降,后期逐渐提高,并超过原来的水平。不同大小的微团聚体代换量不同。施用有机物料引起土壤吸持铵的能力下降。有机处理中,以猪粪处理吸附铵的量最大。不同大小的微团聚体对铵的吸贮释供能力不同。施用有机物料对不同粒级微团聚体吸持NH_4^+的能力的影响不同。

5% organic material was mixed with three alluvial soils collected from Hebei province and then incubated in pots for one year. The ability for absorbing NH_4^+ and cation exchangable capacity (CEC) of soil and microaggreagate were analysed. The results are:With the application of organic materials,the CEC of microaggregate>0.005mm increased significantly and the CEC of <0.005mm decreased or increased weakly. The ability for absorbing NH_4^+ is different between fractions of microaggregte, the absorbing capacity of 0.25—0.01mm fraction is lower than that of 0.01—0.002mm and <0.002mm.The releasing capaeity of NH_4^+ absorbed of 0.25—0.01mm fraction and <0.002mm is lower than that of 0.01—0.002mm fraction. After using organic materials, the absorbability of soils was decreased.