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应用生态学报 ›› 2020, Vol. 31 ›› Issue (11): 3851-3858.doi: 10.13287/j.1001-9332.202011.034

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杉木采伐迹地营造阔叶树种对土壤微生物生态化学计量特征的影响

王涛1,2, 万晓华1,2, 程蕾1,2, 杨军钱1,2, 张冰冰1,2, 邹秉章3, 王思荣3, 余再鹏1,2*, 黄志群1,2   

  1. 1福建师范大学地理科学学院, 福州 350007;
    2湿润亚热带山地生态国家重点实验室培育基地, 福州 350007;
    3福建省上杭白砂国有林场, 福建上杭 364305
  • 收稿日期:2020-03-02 接受日期:2020-08-18 出版日期:2020-11-15 发布日期:2021-06-10
  • 通讯作者: * E-mail: zaipengstephen@163.com
  • 作者简介:王 涛, 男, 1994年生, 硕士研究生。主要从事森林与生态研究。 E-mail: wangtao5168@126.com
  • 基金资助:
    国家自然科学基金项目(3190130336,3193000830)、中国博士后科学基金项目(2019M652238)和福建省自然科学基金项目(2018J01714)资助

Effects of broadleaved tree species on soil microbial stoichiometry in clear-cut patches of Cunninghamia lanceolata plantation

WANG Tao1,2, WAN Xiao-hua1,2, CHENG Lei1,2, YANG Jun-qian1,2, ZHANG Bing-bing1,2, ZOU Bing-zhang3, WANG Si-rong3, YU Zai-peng1,2*, HUANG Zhi-qun1,2   

  1. 1School of Geographical Science, Fujian Normal University, Fuzhou 350007, China;
    2Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China;
    3Shanghang Baisha Forestry Farm, Shanghang 364305, Fujian, China
  • Received:2020-03-02 Accepted:2020-08-18 Online:2020-11-15 Published:2021-06-10
  • Contact: * E-mail: zaipengstephen@163.com
  • Supported by:
    the National Natural Science Foundation of China (3190130336, 3193000830) and China Postdoctoral Science Foundation (2019M652238), and Fujian Natural Science Foundation (2018J01714).

摘要: 研究土壤微生物生物量及其生态化学计量特征对造林树种转换的响应,对深入了解森林生态系统土壤养分循环和有效性具有重要意义。本研究以1993年春在二代杉木采伐迹地上营造的26年生米老排和杉木人工林为对象,采用氯仿熏蒸法测定了0~40 cm土层土壤微生物生物量碳(MBC)、氮(MBN)、磷(MBP)的变化。结果表明: 与杉木人工林相比,米老排人工林0~10 cm土层MBC和0~20 cm土层MBN和MBP均显著提高, 0~20 cm土层MBC/MBP和10~20 cm土层MBN/MBP显著降低。两种人工林所有土层MBC/MBN均无差异。相关分析显示,土壤含水率、总有机碳、总氮、全磷、有效磷与MBC、MBN和MBP呈显著正相关,而与MBC/MBP和MBN/MBP呈显著负相关。逐步线性回归分析表明,MBN和MBP主要受土壤总氮和有效磷的影响,而MBC/MBP和MBN/MBP主要受有机碳和有效磷的驱动。研究表明,造林树种从杉木转换成米老排能够增加表层土壤微生物生物量,加速氮磷养分周转,增加土壤氮磷养分供应能力。米老排人工林土壤MBP的增加可能在一定程度上缓解了树木生长的磷限制。

关键词: 微生物生物量, 生态化学计量学, 阔叶树, 杉木

Abstract: Investigating the response of soil microbial biomass and ecological stoichiometry to tree species transition is of great significance for understanding soil nutrient cycling and availability in forest ecosystems. We measured soil microbial biomass carbon (MBC), nitrogen (MBN), phosphorus (MBP) and their stoichiometry across 0-40 cm soil depth between Mytilaria laosensis and Cunninghamia lanceolata plantations by the chloroform fumigation extraction method, which were replanted after the harvest of C. lanceolata plantation. The results showed that soil MBC in the 0-10 cm layer and soil MBN and MBP in the 0-20 cm layer under the M. laosensis were significantly higher than those under the C. lanceolata. The MBC/MBP in the 0-20 cm layer and MBN/MBP in the 10-20 cm layer were significantly lower under the M. laosensis plantation. The MBC/MBN showed no significant differences between the two forests. Soil moisture, organic carbon, total nitrogen, total phosphorus, available phosphorus were positively correlated with MBC, MBN and MBP, but negatively correlated with MBC/MBP and MBN/MBP. Results of stepwise linear regression analysis showed that MBN and MBP were mainly affected by soil total nitrogen and available phosphorus, while MBC/MBP and MBN/MBP were mainly driven by available phosphorus and organic carbon, respectively. Our results indicated that tree species transition from C. lanceolata to M. laosensis could increase soil microbial biomass in the surface layers, accelerate soil nutrients turnover and enhance soil nutrient supply. The increases of MBP under M. laosensis indicate alleviation of soil phosphorus limitation for tree growth.

Key words: microbial biomass, ecological stoichiometry, broadleaved tree, Chinese fir