关键词: 阴山北麓, 土壤物理性质, 入渗性能, 土壤持水能力

Abstract: In order to analyze the water holding capacity of the forest land and the ability to hold water and soil in Wuchuan, Inner Mongolia, five typical plantation types such as Caragana korshinskii, Pinus tabulaeformis, Hippophae rhamnoides, Pinus tabulaeformis × Caragana korshinskii mixed forest and Hippophae rhamnoides × Caragana korshinskii mixed forest were taken as the research object to determine the soil physical properties, soil water infiltration and analyze the water storage capacity. The results showed that there were significant differences in the soil physical properties among different forest types (P<0.05). The bulk density of Hippophae rhamnoides was the largest (1.452 g·cm-3) and the Pinus tabulaeformis was the smallest (1.042 g·cm-3). The order of noncapillary porosity was Pinus tabulaeformis > Pinus tabulaeformis× Caragana korshinskii mixed forest > Hippophae ×Caragana korshinskii mixed forest > Hippophae rhamnoides > Caragana korshinskii. The order of solid permeability coefficients was consistent with the order of noncapillary porosity. Solid permeability coefficients were between 0.47~1.32 mm·min-1. The solid permeability coefficients regression equation showed that equation analog effect was good. Only the Pinus tabulaeformis and Pinus tabulaeformis × Caragana korshinskii mixed forest was closer to the coefficient 1/2 in the Koctrkob model. The water storage capacity of mixed forest was higher than that of pure forest, while the maximum waterholding capacity of Pinus tabulaeformis × Caragana korshinskii mixed forest was 112.8 t·hm-2 higher than that of Hippophae rhamnoides × Caragana korshinskii mixed forest. It was more suitable for planting Pinus tabulaeformis × Caragana korshinskii mixed forest in the northern foot of Yinshan. The mixed forest of arbor and shrub could improve the water holding capacity more effectively.

Key words: north foot of Yinshan, soil physical properties, infiltration performance, soil waterholding capacity