| 摘要 |
[Objectives] The soil permeability and its influencing factors in typical plantations were studied to provide a scientific basis for tending and managing plantations in the Haikou forest area of Kunming City. [Methods] With three kinds of typical forest stands, i.e., over-mature Pinus armandii Franch., mid-mature Eucalyptus robusta Smith, and over-mature E. robusta Smith in this region as the research objects, soil infiltration changes and the effects on soil water retention in different stands, soil layers, and gap conditions under different moisture conditions were analyzed. [Results] ① Under all three moisture conditions, the over-mature P. armandii forest demonstrated higher overall infiltration rates than the other two forest stands, which showed relatively similar infiltration rates. In all three stands, the soil infiltration rate decreased as the depth of the soil increased. Significant fluctuations in soil infiltration rate were observed during the initial 0-5 min, followed by gradual stabilization or regular fluctuations after 5 min. The infiltration process generally reached saturation after approximately 20 min. ② The average infiltration rate was identified as the key factor affecting soil infiltration. Comprehensive evaluation of soil permeability revealed that the over-mature P. armandii forest exhibited optimal soil permeability. ③ Various soil physical and chemical properties significantly affected different indexes of soil permeability under varying conditions, with soil organic carbon content and water repellency demonstrating particularly notable effects on infiltration under different conditions. [Conclusions] Soil infiltration rates gradually decreased with the deepening of the soil layer. Principal component analysis (PCA) showed that the soil permeability of the over-mature P. armandii forest was stronger than that of the other two stands under the three moisture conditions, especially in non-gap positions. All soil indexes affected soil permeability, and soil organic carbon and water repellency were the key factors affecting soil permeability. |
