Effects of organic matter-bound multivalent cations on the internal and external formation of soil aggregates under Pinus massoniana forest

Zhengui Han is a graduate student of Guizhou Forest Resources and Environmental Research Center, Key Laboratory of Forest Cultivation in Plateau and Mountain Region of Guizhou Province, College of Forestry of Guizhou University, Guizhou Province, China. Yunchao Zhou is a professor at the Guizhou Forest Resources and Environmental Research Center, the Key Laboratory of Forest Cultivation in the Plateau and Mountainous Areas of Guizhou Province, and the Forestry College of Guizhou University, Guizhou Province, China. Jiaojiao Ren is a graduate student of Guizhou Forest Resources and Environmental Research Center, Key Laboratory of Forest Cultivation in Plateau and Mountain Region of Guizhou Province, College of Forestry of Guizhou University, Guizhou Province, China.