土壤中非代换铵的行为——Ⅳ.非代换铵的水平及垂直分布与土壤颗粒组成的关系

The Behaviour of Non-exchangeable Ammonium in Soils IV. The Vertical and Level Distributions of Non-Exchangeable Ammonium and the Relationships Between the Distribution and Soil Clay Contents

在西北24种的基础上,逐次递加杨陵12种、澄城县6个层次的土壤和杨陵另外20种土壤,以构成不同容量的样本。采用相关分析及卡方检验的方法,分别研究了非代换铵含量与颗粒组成、非代换铵的水平分布类型与粘粒分布类型的关系。结果表明,土壤非代换铵含量主要受土壤粘粒含量的影响。土壤粘粒是非代换铵的载体,其含量多少决定着非代换铵的水平;非代换铵的垂直分布与粘粒含量有密切关系,非代换铵的水平分布类型也受粘粒分布类型的制约。

12 soils for pot experiments and 20 for field experiments from Yangling and 6 soil samples from different layers of a field in Chengcheng county were gradually put together with the 24 soils from Northwest China to form different sizes of large sample. Correlation analysis and Chi-square test were used to study the relationships between non-exchageable ammonium and particle compositions, and the relationships between non-exchangeable ammonoum distribution and clay distribution. The results obtained show that the contents of non-exchangeable ammonium were mainly affected by clay contents, and as a matter of fact, clay was the carrier of the non-exchangeable ammonium, the contents of which determined the amounts of the non-exchangeable ammonium. Also, the vertical distribution of non-exchangeable ammonium was well related with clay contens in soil profile, and the spatial distribution type of non-exchangeable ammonium was greatly influenced by clay distribution type.