Distribution and function of cementing materials of soil aggregates on the Loess Plateau, western China
Zhang Yaofang, Zhao Shiwei, Wang Zilong, Li Xiaoxiao, Li Mingrui, Du Can
1.Institute of Soil and Water Conservation, Chinese Academy of Scinences and Ministry of Water Resources,712100,Yangling,Shaanxi,China; 2.University of Chinese Academy of Sciences, 100049, Beijing, China;3.Institute of Soil and Water Conservation, Northwest A & F University, 712100, Yangling, Shaanxi, China;4.People's Government of Jiaocun Town of Lingbao City, 472501, Lingbao, Henan, China
Abstract：Cementing materials are the foundation and key component of the formation and stability of soil aggregates. Combining with the regional characteristics of cementing materials of soil aggregates on the
Loess Plateau, western China, this paper reviews the existing aggregates forming theory and the functions of cementing materials in the process of aggregate formation. The typically regional characteristics of the cementing materials distribution in the soil aggregates of the Loess Plateau are summarized. The clay content is rare with considerably different spatial distribution, and decreases as it goes deeper along the soil profile. The calcium carbonate content, which is around 10% in most area, increases at first and then decreases as it goes deeper along the soil profile. The organic carbon content decreases when it goes from the southeast to the northwest and from the surface to deeper inside. The main problems include: the differences of the cement type in the process of aggregates formation,and the lack of systematic and targeted research on the specific mode and intensity of action of different cements as well as the bonding mechanism of cementing materials. Therefore, the corresponding research directions are proposed.According to the regularity of the cementing materials in the soil profile, future researches should be focused on cementing process, strength and mechanism of three kinds of soil aggregates,which are organic carbon as the main cementing materials on the humus layer, the interaction of organic carbon and calcium carbonate cementing material on the transition layer, and calcium carbonate as the main cementing materials on the illuvial layer.
张耀方1,2, 赵世伟1,3, 王子龙1,2, 李晓晓4, 李明瑞1,2, 杜璨3. 黄土高原土壤团聚体胶结物质的分布及作用综述[J]. 中国水土保持科学, 2015, 13(5): 145-150.
Zhang Yaofang, Zhao Shiwei, Wang Zilong, Li Xiaoxiao, Li Mingrui, Du Can. Distribution and function of cementing materials of soil aggregates on the Loess Plateau, western China. SSWCC, 2015, 13(5): 145-150.
2015, Vol. 13 
