通过云南元谋干热河谷造林区林分生物量及生产力指标与双环入渗试验的土壤入渗性能指标的相关分析，发现乔木生长与土壤渗透性具有显著正相关关系(P＜0.01)，地表枯枝落叶量与土壤渗透性的相关关系也较密切(P＜0.05)，而灌草生长与土壤渗透性无显著相关。研究指出，改善土壤入渗性能的措施，如沿等高线开深沟种植、禁止放牧践踏、保护地表枯枝落叶等均对林木生长有积极的影响。%The effects of soil infiltration on vegetation growth were examined in the Yuanmou Dry-hot Valley, Yunnan Province to increase our knowledge of how the plants in semiarid areas respond to soil water properties. The vegetation of the study area was a mixtrue of planted trees (Eucalyptus camaldulensis Dehl),planted shrubs(major species:Dodonaca viscosa (L.) jacg),natural grasses (major species:Heteropogon contortus).The soils were dry rde soil derived from such parent materials as mudstone, alluvial deposits,schist, and gravel deposits. For each soil, 3 sample plots of 20 m×20 m were taken for measuring tree height,diameter at breast height (DBH),tree biomass,shrub biomass,grass biomass,amount of litter and root debris,and the like. Infiltration rates were determined in the field by double-ring permeameter. The results showed that tree growth was related closely to soil infiltration. There was a highly significant correlation between tree height and steady infiltration rate of soil (P<0.01). A significant correlation was also found between tree DBH and steady infiltration rate of soil (P<0.05). Furthermore, the amount of litter and root debris on ground surface was correlated closely to soil accumulated infiltration (P<0.05). However,no correlation was found betweeen shrub/grass growth and soil infiltration rate or accumulated infilration. It was recommended that some effective measures for improving soil infiltration, including excavating deep ditches when planting seedlings, banning livestock grazing, and protecting the litter and root debris on ground surface be taken to promote plant growth.
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