欢迎访问《草业学报》官方网站,今天是 分享到:

草业学报 ›› 2021, Vol. 30 ›› Issue (5): 25-33.DOI: 10.11686/cyxb2020431

• 研究论文 • 上一篇    下一篇

绿肥不同还田方式对土壤温室气体排放的影响

张学良1(), 张宇亭1, 刘瑞1, 谢军1, 张建伟1, 徐文静1, 石孝均1,2()   

  1. 1.西南大学资源环境学院,重庆 400715
    2.西南大学农业科学研究院,重庆 400716
  • 收稿日期:2020-09-27 修回日期:2020-11-30 出版日期:2021-05-20 发布日期:2021-04-16
  • 通讯作者: 石孝均
  • 作者简介:Corresponding author. E-mail: shixj@swu.edu.cn
    张学良(1995-),男,重庆人,在读硕士。E-mail: 930194678@qq.com
  • 基金资助:
    国家绿肥产业体系(CARS-22-G-13)

Effects of green manure return regimes on soil greenhouse gas emissions

Xue-liang ZHANG1(), Yu-ting ZHANG1, Rui LIU1, Jun XIE1, Jian-wei ZHANG1, Wen-jing XU1, Xiao-jun SHI1,2()   

  1. 1.College of Resources and Environment,Southwest University,Chongqing 400715,China
    2.Academy of Agricultural Science,Southwest University,Chongqing 400716,China
  • Received:2020-09-27 Revised:2020-11-30 Online:2021-05-20 Published:2021-04-16
  • Contact: Xiao-jun SHI

摘要:

为探究不同绿肥在翻压和覆盖两种还田方式下引起的温室气体排放及对土壤微生物量碳氮的影响。采用室内培养试验,设置光叶苕子翻压(VB)、光叶苕子覆盖(VS)、黑麦草翻压(RB)、黑麦草覆盖(RS)和无绿肥(CK) 5个处理,测定土壤CO2、N2O、CH4浓度和微生物量碳(MBC)和微生物量氮(MBN)含量,分析了土壤温室气体的排放速率、累积排放量以及综合增温潜势。结果表明,绿肥还田显著提高了土壤CO2、N2O的排放,不同还田方式(翻压与覆盖还田)及不同绿肥品种对CO2、N2O排放的影响存在显著差异。覆盖还田较翻压还田显著降低了CO2、N2O排放。培养期内绿肥覆盖处理CO2的排放速率和累积排放量比翻压处理降低17.07%~18.55%和8.15%~9.79%;N2O的排放速率和累积排放量降低22.91%~38.35%和17.97%~34.39%。在相同还田方式下,不同绿肥品种显著影响了CO2、N2O排放,豆科绿肥还田引起的CO2、N2O累积排放量比禾本科绿肥高8.87%~10.85%和21.90%~52.42%。各处理土壤温室气体的排放与土壤微生物量碳、微生物量氮(MBC、MBN)含量呈显著正相关,绿肥翻压还田显著提升了MBC、MBN含量,比覆盖还田高21.42%~40.52%和28.22%~34.23%。综上,绿肥覆盖还田比翻压还田更能有效减少土壤温室气体的排放,且有利于保护生态环境和节约人工成本,但是对作物生长及产量的影响有待田间试验验证。

关键词: 绿肥, 还田方式, 温室气体

Abstract:

There is little published data on the impact on subsequent greenhouse gas emissions of different green manure types and return regimes. To address this knowledge gap, a 91-day laboratory incubation experiment was conducted to explore the greenhouse gas emission impacts of green manure types and return regimes. In this study, two green manure species (vetch and ryegrass) with contrasting herbage C∶N ratios were incubated in two different return regimes (surface mulching and burial) to compare soil greenhouse gas emission of the four treatment combinations. Green manure return significantly increased soil CO2 and N2O emissions at all stages of the 91-day incubation period, and soil CO2 and N2O gas emissions also differed significantly between return regimes (surface mulching or burial) and plant species (vetch or ryegrass). The CO2 emissions associated with surface mulching were significantly lower than those following burial. During the incubation period, surface mulching reduced the CO2 emission rate and cumulative total emission by 17.07%-18.55% and 8.15%-9.79%, respectively, and reduced N2O emission rate and cumulative emission by 22.91%-38.35% and 17.97%-34.39%, respectively, compared to burial. For a given return method, green manure species significantly affected CO2 and N2O emissions. The cumulative emissions of CO2 and N2O following leguminous green manure return were 8.87%-10.85% and 21.90%-52.42% higher, respectively, than those of Poaceous green manure. There was a significant positive correlation between greenhouse gas emissions and soil microbial biomass carbon and nitrogen (MBC, MBN) in each treatment. Compared with surface mulching, green manure burial increased MBC by 21.42%-40.52% and MBN by 28.22%-34.23% (P<0.05). To sum up, green manure mulching can reduce greenhouse gas emissions more effectively than ploughing, and is thus conducive to protecting the ecological environment and saving labor costs, but the impact on crop growth and yield needs to be verified by field experiments.

Key words: green manure, returning regimes, greenhouse gas