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首页> 外文期刊>Journal of soil & sediments >Effect of organic matter manipulation on the seasonal variations in microbial composition and enzyme activities in a subtropical forest of China
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Effect of organic matter manipulation on the seasonal variations in microbial composition and enzyme activities in a subtropical forest of China

机译：有机物对中国亚热带森林微生物组成和酶活性季节性变化的影响

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摘要

Purpose: The aim of this study was to determine the impacts of reduced aboveground and belowground C inputs on the community composition of soil microbes and enzyme activities in a seasonal context.Materials and methods Litterfall removal, root exclusion, and stem girdling treatments under a subtropical conifer plantation growing on a coarse texture of sandy soil in southeast China were employed. One year after the initiation of the treatments, we measured the soil microbial biomass, community composition, and enzyme activities, including hydrolytic and oxidative extracellular enzymes on a seasonal basis. Soil inorganic N, dissolved organic C and N, and available P were also determined.Results and discussion Seasonal variations of soil microbial composition and enzyme activities were attributed to soil temperature and moisture and soil nutrient availability. Girdling treatments significantly increased the abundances of gram-negative bacteria and actinomycetes in winter when soil temperature, moisture, and available nutrients were at the lowest level among the four seasons. Girdling alone and girdling combined with litter removal and root trenching significantly decreased the cellobiohydrolase, beta-glucosidase, beta-1,4-N-acetylglucosaminidase, and acid phosphatase activities in autumn. These hydrolytic enzyme activities were significantly correlated with soil moisture, NH4+, DOC, and available P. We also found a significant relationship between hydrolytic enzyme activities and the ratio of gram-positive to gram-negative bacteria.Conclusions Plant belowground C allocation, soil temperature, and moisture drove the seasonal patterns of soil microbial composition and enzyme activities. Labile C input by root exudates is a key determinant of ecosystem functions mediated by soil microbes such as microbial decomposition processes.
机译：目的：本研究的目的是确定季节性环境下地上和地下碳输入减少对土壤微生物和酶活性的群落组成的影响。材料和方法亚热带地区的凋落物去除，根系排斥和茎环处理针叶树人工林生长在中国东南的砂质土壤上。治疗开始一年后，我们按季节测量了土壤微生物的生物量，群落组成和酶活性，包括水解和氧化性细胞外酶。结果与讨论土壤微生物组成和酶活性的季节性变化与土壤温度，水分和土壤养分的有效利用有关。在冬季，当土壤温度，湿度和可用养分处于四个季节中的最低水平时，环剥处理显着增加了革兰氏阴性细菌和放线菌的数量。单独环剥和环剥，再加上去除凋落物和挖沟，在秋天显着降低了纤维二糖水解酶，β-葡萄糖苷酶，β-1,4-N-乙酰氨基葡萄糖苷酶和酸性磷酸酶的活性。这些水解酶的活性与土壤水分，NH4 +，DOC和有效磷显着相关。我们还发现水解酶的活性与革兰氏阳性菌和革兰氏阴性菌的比例之间存在显着的关系。和水分驱动土壤微生物组成和酶活性的季节性变化。根系分泌物输入的不稳定碳是土壤微生物（例如微生物分解过程）介导的生态系统功能的关键决定因素。

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  • 来源
    《Journal of soil & sediments》 |2019年第5期|2231-2239|共9页
  • 作者

    Wan Xiaohua; Li Xiang; Sang Changpeng; Xu Zhihong; Huang Zhiqun;

  • 作者单位

    Fujian Normal Univ, Minist Sci & Technol & Fujian Prov, State Key Lab Subtrop Mt Ecol, Fuzhou 350007, Fujian, Peoples R China|Fujian Normal Univ, Coll Geog Sci, Fuzhou 350007, Fujian, Peoples R China;

    State Grid Fujian Elect Power Co Ltd, Maintenance Branch Co, Fuzhou 350014, Fujian, Peoples R China;

    Fujian Normal Univ, Minist Sci & Technol & Fujian Prov, State Key Lab Subtrop Mt Ecol, Fuzhou 350007, Fujian, Peoples R China|Fujian Normal Univ, Coll Geog Sci, Fuzhou 350007, Fujian, Peoples R China;

    Griffith Univ, Sch Nat Sci, Environm Futures Res Inst, Brisbane, Qld 4111, Australia;

    Fujian Normal Univ, Minist Sci & Technol & Fujian Prov, State Key Lab Subtrop Mt Ecol, Fuzhou 350007, Fujian, Peoples R China|Fujian Normal Univ, Coll Geog Sci, Fuzhou 350007, Fujian, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Enzyme activity; Girdling; Litterfall removal; Root trenching; Soil microbial composition;

    机译：酶活性;带状;除草;根Ro;土壤微生物组成;

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