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以江苏省靖江市牧城公园和东湖公园两种种植年限分别为5 a和9 a的中山杉(Taxodium hybrid’Zhongshanshan’)人工林土壤和无林地为研究对象,对0~15 cm、15~30 cm和30~45 cm深度土层土壤理化性质、养分含量和微生物生物量进行了分析。典型相关分析表明,土壤微生物生物量的变化是一个复杂的过程,是土壤各因子共同作用的结果,3种土壤U、V值均表现出层次性,随着土壤深度的增加逐渐降低;不同取样点相同深度土层U、V值为9 a林>5 a林>对照;单相关分析表明,土壤微生物生物量与速效磷、速效钾、有机质和全氮呈极显著正相关(P<0.01),因此土壤微生物可以作为评价中山杉人工林在促进林地土壤质量改善过程中的重要生物指标;主成分分析表明,综合得分最高的9 a林为2.993,其次是5 a林为0.748,作为对照的无林地则为-3.742,说明9 a林地土壤质量最高。可见,中山杉对林下土壤质量有显著提高作用。
The soil and non-forestland of two species of Artificial Chinese fir (Taxodium hybrid’Zhongshanshan ’) with 5 years and 9 years of planting years in Jingcheng City, Jiangsu Province, and East Lake Park were studied. The soil physical and chemical properties, nutrient contents and microbial biomass at depths of 30 cm and 30 ~ 45 cm were analyzed. Canonical correlation analysis showed that the change of soil microbial biomass was a complex process and was the result of the interaction of various soil factors. The U and V values of all three soils showed a gradation and decreased with the increase of soil depth. The results showed that there was a significant positive correlation between soil microbial biomass and available P, available K, organic matter and total N (P <0.01) Therefore, soil microorganism can be used as an important bio-index to evaluate the improvement of Zhongshan Sugarcane plantation in the process of soil quality improvement. Principal component analysis showed that the highest comprehensive score was 2.993 for 9 a and the second was 5 a for 0.748, The non-forest land was -3.742, which showed that the soil quality was the highest in 9 years. Visible, Zhongshan fir soil quality under the forest significantly improve.