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    张健飞, 王淳, 徐雯雯, 黄选瑞, 张志东. 华北落叶松不同代际人工林土壤养分及细菌群落变化特征[J]. 北京林业大学学报, 2020, 42(3): 36-45. DOI: 10.12171/j.1000-1522.20190256
    引用本文: 张健飞, 王淳, 徐雯雯, 黄选瑞, 张志东. 华北落叶松不同代际人工林土壤养分及细菌群落变化特征[J]. 北京林业大学学报, 2020, 42(3): 36-45. DOI: 10.12171/j.1000-1522.20190256
    shu
    Zhang Jianfei, Wang Chun, Xu Wenwen, Huang Xuanrui, Zhang Zhidong. Changes in soil nutrients and bacterial communities of Larix principis-rupprechtii plantations of different generations[J]. Journal of Beijing Forestry University, 2020, 42(3): 36-45. DOI: 10.12171/j.1000-1522.20190256
    Citation: Zhang Jianfei, Wang Chun, Xu Wenwen, Huang Xuanrui, Zhang Zhidong. Changes in soil nutrients and bacterial communities of Larix principis-rupprechtii plantations of different generations[J]. Journal of Beijing Forestry University, 2020, 42(3): 36-45. DOI: 10.12171/j.1000-1522.20190256
    shu

    华北落叶松不同代际人工林土壤养分及细菌群落变化特征

    Changes in soil nutrients and bacterial communities of Larix principis-rupprechtii plantations of different generations

      摘要
    • 摘要:
      目的探究不同代际华北落叶松人工林土壤养分及细菌变化有助于了解地力维持机制。为华北落叶松人工林可持续经营提供参考。
      方法本研究以塞罕坝地区华北落叶松不同代际人工林（一代林（17和37年生）、二代林（14年生））为研究对象，分析了不同代际林及不同土层土壤养分、土壤细菌群落组成和多样性的变异规律及土壤养分与细菌群落的耦合关系。
      结果（1）在0 ~ 10 cm和10 ~ 20 cm土层，一代林（17年生）和二代林（14年生）的速效钾和有效磷显著高于一代林（37年生）（P < 0.05），但一代林（17年生）和二代林（14年生）间差异不明显（P > 0.05）。随着土壤深度增加，各代际林土壤养分均呈现降低趋势。（2）在门水平上，3个林分的优势菌群均为变形菌门、放线菌门、疣微菌门和酸杆菌门。随着土层深度的增加，3个林分的变形菌门和放线菌门呈迅速下降趋势。（3）一代林（37年生）的ACE和Chao1细菌丰富度指数在3个代际林中最低，且在0 ~ 10 cm和20 ~ 30 cm土层代际林间差异显著（P < 0.05）。在3个土层深度，土壤细菌多样性指数在一代林（17年生）和二代林（14年生）中相对较高，而在一代林（37年生）中相对较低。（4）相关分析表明，速效钾与变形菌门和放线菌门显著正相关，而与硝化螺旋菌门显著负相关（P < 0.05）。随着有效磷含量的增加，变形菌门数量呈显著增加趋势（P < 0.05）。
      结论华北落叶松二代林在早期发育阶段不存在地力衰退问题，随着林龄的增加，应加强速效钾、有效磷和碱解氮的调控，并重视特定细菌群落的变化以维持土壤肥力。

       

      Abstract:
      ObjectiveExploring the variations of soil nutrients and bacterial communities in Larix principis-rupprechtii plantations with different generations is helpful to understand maintenance mechanisms of soil fertility. It provides a reference for the sustainable management of Larix principis-rupprechtii plantation.
      MethodIn this study, three Larix principis-rupprechtii plantations with different generations, including 17 years old first generation (Y1R), 37 years old first generation (M1R), 14 years old second generation (Y2R), were selected in Saihanba Area of northern China. The coupling relationship between soil nutrients and bacterial communities and their changes over generations were analyzed.
      Result(1) In depths of 0−10 cm and 10−20 cm, the contents of soil readily available potassium (AK) and available phosphorous (AP) were significantly higher in Y1R and Y2R than in M1R (P < 0.05). There were no significant differences in soil AK and AP between Y1R and Y2R (P > 0.05). Soil nutrients showed a decreasing trend with increasing soil depths in all generations. (2) The dominant bacterial phyla were Proteobacteria, Actinobacteria, Verrucomicrobia and Acidobacteria in all generations. Proteobacteria and Actinobacteria decreased with increasing soil depth in all generations. (3) The ACE and Chao1 indicators of bacterial community were the lowest in M1R and their changes were significant among generations at depths of 0−10 cm and 10−20 cm. In all three soil layers, the soil bacterial diversity indicators were relatively higher in Y1R and Y2R than in M1R. (4) Correlation analysis showed that AK had significantly positive effects on Proteobacteria and Actinobacteria, while had significantly negative impact on Nitrospirae (P < 0.05). The number of Proteobacteria increased significantly with increasing AP content (P < 0.05).
      ConclusionSoil fertility doesn,t decline at the early development stage in second generation of Larix principis-rupprechtii plantations. Strengthening the regulation of soil available potassium, alkali hydrolyzable nitrogen and available phosphorus, and focusing on changes in specific soil microorganisms could be the optimum alternatives to improve soil fertility.

       

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