不同碳源对植烟土壤碳平衡的影响
作者:
作者单位:

(1.中国农业科学院农业资源与农业区划研究所/烟草行业生态环境与烟叶质量重点实验室,北京 100081;2.黑龙江八一农垦大学农学院,黑龙江 大庆 163319;3.福建农林大学资源与环境学院,福建 福州 350002;4.四川烟草公司攀枝花市公司,四川 攀枝花 617026)

作者简介:

李健铭(1993-),男,黑龙江伊春人,博士研究生,主要研究方向为生态系统碳循环。E-mail:lijianmingsci@163.com。

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基金项目:

基金项目:中国烟草总公司四川省公司科技项目(SCYC201702,SCYC201707)。


Effects of different carbon sources on carbon balance in tobacco soil
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(1.Institute of Agricultural Resource and Regional Planning,Chinese Academy of Agricultural Sciences/Key Laboratory of Ecological Environment and Tobacco Quality in Tobacco Industry,Beijing 100081;2.College of Agriculture Heilongjiang Bayi Agricultural University,Daqing Heilongjiang 163319;3.College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou Fujian 350002;4.Sichuan Tobacco Company Panzhihua City Company,Panzhihua Sichuan 617026)

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    摘要:

    为探索不同碳源对土壤碳的提升作用,开展了不同碳源对烤烟生长季土壤碳平衡影响的研究,旨在为植烟土壤有机肥施用调控提供理论依据。试验设在四川省攀枝花市,以烤烟为供试作物进行田间小区试验。设对照(不施有机肥)、秸秆、农家肥、油枯、农家肥+油枯5个不同施肥处理,3次重复。采用VaisalaMI70土壤呼吸测量系统进行田间监测,并同时观测环境条件。对烤烟根系进行收集,测定土壤根系固碳量。研究结果显示,1)在烤烟生长季,植烟土壤呼吸动态呈倒“S”型的先下降后上升再下降的变化规律,施用有机肥增加了土壤呼吸强度,尤其是在有机肥施用初期。2)烤烟生长季碳排放量平均为385.84 kg·hm-2,不同处理碳排放量表现为对照293.11 kg·hm-2,秸秆396.9 kg·hm-2,农家肥363.36 kg·hm-2,油枯422.98 kg·hm-2,油枯+农家肥452.84 kg·hm-2。3)不同碳源分解速率差异较大,生长季分解系数为0.22~0.42,秸秆和农家肥分解系数低于油枯。4)有机肥的施用对烤烟根系碳积累量的提升效果不明显,而各有机肥处理相比,农家肥以及农家肥与油枯混施相对于秸秆处理能够显著增加烤烟根系碳积累量。5)当地耕作模式下,整个生育期有56.42%的烤烟根系残留于土壤,可补偿土壤碳260.56 kg·hm-2,烤烟根系碳是常规施肥下土壤碳的主要来源。6)常规施肥下,单施化肥植烟土壤表现为碳源,有机无机配施下植烟土壤表现为碳汇。有机肥的施用能够提升土壤碳平衡,减少碳损失;采用农家肥与油枯混施也能够在一定程度上促进烤烟根系碳积累的提升。

    Abstract:

    In order to explore the promotion effects of different carbon sources on soil carbon,a study was carried out on the influence of different carbon sources on soil carbon balance in the growing season of flue-cured tobacco,aiming at providing theoretical basis for the regulation of soil organic fertilizer application.A field experiment was conducted in Panzhihua city,Sichuan province,using flue-cured tobacco as tested crop.Five fertilization treatments were set up:control(no organic fertilizer),straw,farmyard fertilizer,oil cake,farmyard fertilizer and oil cake,and repeated for 3 times.Field monitoring was conducted using VaisalaMI70 soil respiration measuring system,and environmental conditions were observed at the same time.The carbon sequestration of flue-cured tobacco roots was measured.The results showed that :1)In the growth season of flue-cured tobacco,the soil respiration dynamics of tobacco plants showed an inverted “S” pattern,at first it went down,then rose and fell again.The application of organic fertilizer increased the soil respiration intensity,especially in the early application of organic fertilizer.2)The average carbon emission of flue-cured tobacco in the growing season was 385.84 kg·hm-2,and the carbon emission of different treatments was 293.11,396.9,363.36,422.98,452.84 kg·hm-2,for the treatment of contrast,straw,farmyard fertilizer,oil cake,oil cake+farmyard fertilizer,respectively.3)The decomposition rate of different carbon sources was significantly different,with a decomposition coefficient of 0.22~0.42 in the growing season.The decomposition coefficient of straw and farmyard fertilizer was lower than that of oil cake.4)The application of organic fertilizer had no obvious effect on the improvement of root carbon accumulation in flue-cured tobacco.Farmyard fertilizer as well as farmyard fertilizer and oil residue mixed fertilizer significantly increased the root carbon accumulation of flue-cured tobacco compared with the treatment of straw.5)In the local farming,the 56.42% roots of flue-cured tobacco remained in soil though the whole growth period,which compensated soil carbon by 260.56 kg·hm-2.The root carbon of flue-cured tobacco is the main source of soil carbon under conventional fertilization.6)In conventional fertilization,the tobacco soil under single application of fertilizer presented carbon source,while the tobacco soil under organic and inorganic fertilization presented carbon sink.The application of organic fertilizers can improve soil carbon balance and reduce carbon loss.Up to a point,the application of farmyard fertilizer mixed with oil cake can also promote the growth of flue-cured tobacco root carbon accumulation.

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李健铭,李志宏,王鹏,张云贵,熊维亮,张美娟,李君,辛刚,刘青丽.不同碳源对植烟土壤碳平衡的影响[J].中国土壤与肥料,2021,(1):124-130.

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  • 收稿日期:2019-11-29
  • 最后修改日期:
  • 录用日期:2020-02-21
  • 在线发布日期: 2021-03-18