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通过野外调查和室内实验相结合的研究方法,测定了水曲柳(Fraxinus mandschurica Rupr.)、大果榆(Ulums macrocarpa Hance.)和蒙古栎(Quercus mongolica Fisch.ex Turcz.)植物群落土壤养分含量及pH值,测定了7年生水曲柳、大果榆和蒙古栎苗木根系生物量,分析了3种植物根系生物量垂直分布与土壤养分及pH值之间的相互关系。结果表明:水曲柳群落在0～60cm土壤深度内,特别是表层土壤中有机碳、全氮、全磷和速效氮、速效磷、速效钾均高于大果榆和蒙古栎群落;每种植物根系生物量的垂直变化都呈指数递减;3种植物根系的总生物量依次为:大果榆4.04g﹥水曲柳2.63g﹥蒙古栎2.21g;3种植物根系生物量垂直分布都与土壤有机碳、全氮、全磷、速效氮、速效磷和速效钾在0.05水平下显著相关;水曲柳根系生物量垂直分布与pH值在0.05水平下显著相关,而大果榆和蒙古栎根系生物量与pH值无关。
The soil nutrient contents of plant communities of Fraxinus mandschurica Rupr., Ulums macrocarpa Hance. And Quercus mongolica Fisch.ex Turcz. Were determined by the combination of field investigation and laboratory experiments. And the pH value of the 7-year-old rootstock, the root biomass of 7-year-old Fraxinus mandshurica, Druoeil indica and Quercus mongolica seedlings were measured. The correlations between the vertical distribution of root biomass of three plants and soil nutrient and pH value were analyzed. The results showed that the soil organic carbon, total nitrogen, total phosphorus, available nitrogen, available phosphorus and available potassium were all higher in the soil depth of 0-60 cm, especially in the surface soil The vertical variation of plant root biomass decreased exponentially. The total biomass of the three plant roots was 4.04g, 2.63g> 2.48g> Quercus mongolica. The root biomass distribution of the three plants was Soil organic carbon, total nitrogen, total phosphorus, available nitrogen, available phosphorus and available potassium were significantly correlated at 0.05 level. The vertical distribution of root biomass of Fraxinus mandshurica was significantly correlated with pH value at 0.05 while that of Drujunyu and Quercus mongolica Root biomass has nothing to do with pH.