【摘要】 用渗水采集器在杉木、火炬松、落叶栎林土壤中定期取水样分析，结果表明，５～６月份土壤渗滤水中的离子浓度普遍比７～８月份高得多，它们的深度分布模式也因月份而异。杉林与栎林下土壤渗滤水的离子浓度及分布模式大同小异，但浓度大体上均高于松林，模式也与后者不同。５～６月份杉林地各种离子的淋失强度为最大，栎林地次之，松林地为最小；７～８月份则以栎林地淋失强度为最大，杉林地次之，松林地仍为最小。每年通过土壤渗滤水向下淋失的养分数量，相当于凋落物所归还养分量的１％～１０％左右，其中以杉林下的淋失比率最大。更多还原

【Abstract】 Water sample collected periodically, by means of lysimeters. from soils under Chinese fir, loblolly pine and deciduous oak were analysed. It was shown that the concentrations of various ions in percolating water collected from May to June were much higher than these from July to August in general, and their patterns of distribution along soil depth varied with sampling dates. The ion concentrations in soil Percolating water and their distribution Patterns under Chinese fir and oak stands were alike except for slight differences, but different from those under loblolly pine stand. From May to June the leaching intensities of various ions under Chinese fir stand were the strongest, those under oak stand ranked second, and those under loblolly pine sland were the weakest; whereas from July to August oak stand ranked first, Chinese fir stand the second, and loblolly pine stand still the weakest. The annual amounts of nutrients leaching downwards by soil Percolating water corresponded to about 1～10% of nutrient amounts returned from litterfall, among them the ratio of leaching loss to return amount under Chinese fir stand was the highest.更多还原