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应用生态学报 ›› 2018, Vol. 29 ›› Issue (7): 2259-2268.doi: 10.13287/j.1001-9332.201807.031

• 研究报告 • 上一篇    下一篇

枯落物处理对格木林土壤碳氮转化和微生物群落结构的短期影响

罗达1,2, 史作民2,3*, 李东胜4   

  1. 1新疆林业科学院经济林研究所, 乌鲁木齐 830063;
    2中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境重点实验室, 北京 100091;
    3南京林业大学南方现代林业协同创新中心, 南京 210037;
    4河北省林业调查规划设计院, 石家庄 050051
  • 收稿日期:2018-03-29 出版日期:2018-07-18 发布日期:2018-07-18
  • 通讯作者: *E-mail: shizm@caf.ac.cn
  • 作者简介:罗 达, 男, 1984年生, 博士. 主要从事森林土壤碳氮循环研究. E-mail: luoda2010@163.com
  • 基金资助:

    本文由国家重点研发计划项目(2016YFC0502104-02)和中国林业科学研究院基本科研业务费专项(CAFYBB2018ZA003)资助.

Short-term effects of litter treatment on soil C and N transformation and microbial community structure in Erythrophleum fordii plantation.

LUO Da1,2, SHI Zuo-min2,3*, LI Dong-sheng4   

  1. 1Institute of Economic Forestry, Xinjiang Academy of Forestry Science, Urumqi 830063, China;
    2State Forestry Administration Key Laboratory on Forest Ecology and Environmental Sciences, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
    3Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China;
    4Hebei Forestry Survey and Design Institute, Shijiazhuang 050051, China
  • Received:2018-03-29 Online:2018-07-18 Published:2018-07-18
  • Contact: *E-mail: shizm@caf.ac.cn
  • Supported by:

    This work was supported by the National Key Research and Development Program (2016YFC0502104-02) and the Fundamental Research Fund of Chinese Academy of Forestry (CAFYBB2018ZA003).

摘要: 以我国南亚热带格木人工纯林为研究对象,采用气压过程分离(BaPS)技术和磷脂脂肪酸(PLFAs)法研究了不同枯落物处理(对照、枯落物去除、枯落物加倍)下土壤碳氮转化速率和微生物群落结构的季节变化.结果表明:不同枯落物处理土壤呼吸和总硝化速率均呈现明显的季节动态,雨季显著高于旱季.枯落物处理初期,土壤呼吸和总硝化速率均随枯落物输入量的增加呈下降趋势,但随着枯落物处理时间的延长,二者随枯落物输入量的增加而增加.旱季不同枯落物处理土壤微生物PLFAs总量和各菌群PLFAs量均显著高于雨季,而雨季真菌PLFAs/细菌PLFAs明显高于旱季.在旱季,枯落物去除处理土壤微生物PLFAs总量、细菌PLFAs量、真菌PLFAs量和丛枝菌根真菌PLFAs量分别显著提高30.9%、28.8%、44.4%和31.6%.在雨季,枯落物去除处理细菌PLFAs量和丛枝菌根真菌PLFAs量分别显著降低10.6%和33.3%.土壤微生物群落结构受枯落物输入量处理和季节的双重影响,土壤微生物群落结构主要受土壤温度和铵态氮的影响.枯落物输入量处理在短期内显著影响了格木林土壤碳氮转化速率和微生物群落结构,这种影响因季节的不同而存在差异.

Abstract: In southern subtropical China, the seasonal variations of soil carbon (C) and nitrogen (N) transformation rates and microbial community structure under different litter treatments (control, litter removal, litter double) in Erythrophleum fordii plantation were studied by the methods of barometric process separation (BaPS) and phospholipid fatty acids (PLFAs) profiles. The results showed that there were significant seasonal variations in soil respiration and gross nitrification rates under different litter treatments, with significantly higher rates in the rainy season than in the dry season. In the initial stage of litter treatment, soil respiration and gross nitrification rates decreased with increasing litter inputs. With prolonged litter treatment, both of them increased with increasing litter inputs. The total microbial PLFAs and each microbial group PLFAs under different litter treatments were significantly higher in the dry season than those in the rainy season. The fungal PLFAs/bacterial PLFAs in the rainy season were significantly higher than that in the dry season. In the dry season, litter removal significantly increased the total microbial PLFAs, bacterial PLFAs, fungal PLFAs and arbuscular mycorrhizal fungal (AMF) PLFAs by 30.9%, 28.8%, 44.4% and 31.6%, respectively. In the rainy season, litter removal significantly decreased the bacterial PLFAs and AMF PLFAs by 10.6% and 33.3%, respectively. Soil microbial community structure was affected by both litter input treatments and seasons. Soil temperature and NH4+-N were the key determinants influencing the microbial community structure. The litter input treatments in E. fordii plantation had significant impacts on soil C and N transformation rate and microbial community structure in short-term, which were dependent on seasons.