茶园土壤微生物量碳的质量分数及其影响因素的研究
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(中国农业科学院茶叶研究所,浙江 杭州 310008)

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李梦菡(1996-),女,四川成都人,硕士研究生,研究方向为茶树栽培生理与生态。E-mail:lmhan0813@126.com。

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基金项目:国家重点研发计划政府间国际科技创新合作重点专项(2017YFE0107500);中国农业科学院科技创新工程(CAAS-ASTIP-2015-TRICAAS-08)。


Study on the mass fraction of soil microbial biomass carbon and its influencing factors in tea gardens
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(Tea Research Institute,Chinese Academy of Agricultural Sciences,Hangzhou Zhejiang 310008)

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    摘要:

    对148个茶园土壤的微生物量碳(MBC)质量分数及其影响因素进行了研究。结果表明,茶园土壤MBC的质量分数(ωmic)在38.1~680.2 mg·kg-1之间,平均为246.0 mg·kg-1,其含量变化幅度较大,主要受到土壤有机碳、pH、茶园管理方式、植茶年限、成土母质以及全氮量的影响。(1)茶园土壤的ωmic与有机碳的质量分数(ωorg)呈显著正相关,与pH存在一定范围的正相关,改良过度酸化的土壤能明显提高ωmic。(2)ωmic随植茶年限的增加呈现先升高后降低的势,在45年左右的茶园中含量最高,达到了(597.7 ± 89.2)mg·kg-1。(3)有机管理茶园的ωmic显著高于转换茶园和常规茶园(P<0.05)。(4)花岗岩、安山斑岩和红砂岩发育的茶园土壤的ωmic显著高于第四纪红土和石灰岩发育的土壤(P<0.05)。(5)ωmic随茶园全氮量的增加也呈先升高后降低的趋势。在茶园土壤ωmic的影响因素中,影响最大的是土壤有机碳,其次为pH、成土母质、植茶年限及全氮量。由此可见,要提高茶园土壤的ωmic,可采取多施有机肥,推广有机茶园管理模式,合理施氮,适当提高土壤pH和改植换种老茶园等措施。

    Abstract:

    The content of microbial biomass carbon(MBC)and its influencing factors in 148 tea garden soils were studied. The results showed that the mass fraction of MBC(ωmic)in tea gardens ranged from 38.1~680.2 mg·kg-1,with an average of 246.0 mg·kg-1,and its content varies grealty,mainly influenced by soil organic carbon,pH,tea plantation management,tea plant standing age and soil parent material.(1)There was a significant positive correlation between ωmic and the mass fraction of organic carbon(ωorg)in tea garden soil,and a certain positive correlation with pH.Liming of very acidic soil could significantly increase its ωmic.(2)ωmic increased initially and then decreased with the increase of tea plant standing age,with the highest around 45 years old,reaching(597.7 ± 89.2)mg·kg-1.(3)ωmic in the organic management tea gardens was significantly higher than those in conventional and conversional tea gardens(P<0.05). (4)ωmic was significantly higher in the soils derived from parent materials of granite,Anshan porphyry and red sandstone than these derived from quaternary red soil and limestone(P<0.05).(5)ωmic increased firstly and then decreased with the increase of total N in tea gardens.Among the influencing factors of ωmic in tea garden soil,organic carbon was the most influential factor,followed by soil pH,soil parent material,age of tea plant and total N.Therefore,in order to improve ωmic in tea gardens to maintain and improve soil fertility,we should take the measures,such as applying more organic fertilizer,promoting the organic management,controlling the amount of nitrogen fertilizer applied,increasing soil pH appropriately and replacing old tea gardens.

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李梦菡,张丽平,李鑫,颜鹏,张兰,韩文炎.茶园土壤微生物量碳的质量分数及其影响因素的研究[J].中国土壤与肥料,2021,(1):26-33.

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  • 收稿日期:2019-12-17
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  • 录用日期:2020-02-21
  • 在线发布日期: 2021-03-18