摘要
为探讨紫色土土粒的不同机械组成同团聚体结构特征的内在联系,分别选取川东北丘陵地区8组紫色荒土的3个深度(10 cm,30 cm,50 cm)的土样为实验样本,通过干筛法和湿筛法对土壤团聚体进行分析,选取GMD,MWD,以及分形维数D表征团聚体抗稳定性,同时探讨各粒径土粒同各粒径团聚体的相互关系,结果表明不同粒径土粒在复合胶结成土壤团聚体具有不同偏好:1~0.05 mm的砂粒容易胶结成0.5~1 mm和1.0~2.0 mm的大团聚体;粗粉粒含量较难形成1~2 mm团聚体,却较易形成大于5 mm团聚体,抗水稳性较差;土壤中较细部分同微团聚体的含量多寡呈现明显的负相关,同大团聚体的多寡呈现显著正相关。
In order to explore the intrinsic relationship between different mechanical compositions of purple soil particles and aggregates’ structural characteristics, eight groups of soil samples with three depths (10 cm, 30 cm, 50 cm) of purple waste soil were selected as experimental samples, and soil aggregates were analyzed by dry and wet sieving methods. GMD, MWD and fractal dimension D were selected to characterize the stability of aggregates against external forces, and at the same time, the soil particles with different sizes were discussed. The results show that the aggregates with different particle sizes have different preferences when they are cemented into soil aggregates. 1 - 0.05 mm sand particles are easy to cement into 0.5 - 1 mm, 1.0 - 2.0 mm aggregates, but their water stability is not high. It is difficult to form 1 - 2 mm aggregates with coarse powder content, but more easily to form aggregates larger than 5 mm, but the water stability of aggregates is poor. The content of macroaggregates was negatively correlated with that of microaggregates, and positively correlated with that of macroaggregates.
出处
《土壤科学》
2020年第2期43-52,共10页
Hans Journal of Soil Science
基金
本项目受西华师范大学英才基金资助(17YC116)。
