我国五种主要土壤水稳性团聚体含量研究

认识土壤水稳性团聚体含量对于研究土壤肥力、质量及侵蚀程度具有重要的意义。采用非真空快速浸润法、非真空快速滴水浸润法和非真空慢速气溶胶浸润法3种方法,测定了黑土、褐土、黄土、红壤、紫色土等5种土壤的水稳性团聚体含量。通过对不同方法所测结果的稳定性和差异性进行分析,可知非真空快速浸润法测定的土壤水稳性团聚体含量最小,非真空慢速气溶胶浸润法测定的含量最大,非真空快速滴水浸润法所测结果介于前2种方法所测结果之间。根据5种土壤的水稳性团聚体含量在3种方法间的差异,将5种土壤分为黑土与紫色土、黄土、褐土与红壤3种类型;5种土壤在3种方法下所测定的土壤水稳性团聚体含量的排序分别为:黄土<黑土<褐土<紫色土<红壤,黄土<褐土<红壤<黑土<紫色土,黄土<褐土<黑土<红壤<紫色土。

Content of Five Main Soil Water-Stable Aggregates in China

The content of water-stable aggregates has very important significance for soil fertility,quality and erosion.According to three different methods which were no vacuum fast pre-wetting,no vacuum fast dripping pre-wetting and no vacuum slow vapor pre-wetting,the content of water-stable aggregates of 5 kinds of soil that were black soil,cinnamon soil,loess soil,red soil and purple soil were measured.Based on the stability and difference analysis,the results are found that a) the content of water-stable aggregates by no vacuum fast pre-wetting is the least;b) that by no vacuum slow vapor pre-wetting is the most and;c) that by no vacuum fast dripping pre-wetting is moderate.Depending on differences of 5 kinds of soil in 3 infiltration methods,3 kinds of soil types are found which are black soil and purple soil type,loess soil type,cinnamon soil and red soil type.The content of water-stable aggregates of 5 kinds of soil in 3 different methods is sorted up.The results show that loess soil < black soil < cinnamon soil < purple soil < red soil,loess soil < cinnamon soil < red soil < black soil < purple soil and loess soil < cinnamon soil < black soil < red soil < purple soil respectively.