刈割对晋西北赖草草地温室气体通量的影响

doi:10.11733/j.issn.1007-0435.2021.01.003

草地学报 ›› 2021, Vol. 29 ›› Issue (1): 17-24.DOI: 10.11733/j.issn.1007-0435.2021.01.003

刈割对晋西北赖草草地温室气体通量的影响

李超, 常馨, 闫卫东, 董宽虎

山西农业大学草业学院, 山西太谷 030801

收稿日期:2020-07-07 修回日期:2020-08-24 出版日期:2021-01-15 发布日期:2021-01-08
通讯作者: 董宽虎
作者简介:李超(1995-),女,硕士研究生,主要从事草地生态与管理研究,E-mail:iatherain@126.com
基金资助:
国家自然科学基金面上项目（31572452，31872406）资助

Effects of Mowing on Greenhouse Gas Fluxes of Leymus secalinus Communities in Northwestern Shanxi Province

LI Chao, CHANG Xin, YAN Wei-dong, DONG Kuan-hu

College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China

Received:2020-07-07 Revised:2020-08-24 Online:2021-01-15 Published:2021-01-08

摘要/Abstract

摘要： 为探讨草地温室气体通量对不同刈割强度的响应情况、优化草地利用方式及强度，本研究通过在晋西北赖草（Leymus secalinus）草地构建不同强度的刈割试验，采用静态箱/气相色谱法定量研究了不刈割、轻度刈割、中度刈割和重度刈割对3种温室气体（CO₂，CH₄和N₂O）通量的影响及温室气体通量与主要环境因子的关系。2017年和2018年生长季及非生长季观测结果表明，不同刈割强度下的草地均表现为CO₂和N₂O的源、CH₄的汇；刈割于2018年生长季显著影响CH₄和N₂O通量（P<0.05）；3种温室气体通量与土壤温度呈显著指数相关（P<0.05），CO₂通量与土壤体积含水量、N₂O通量呈显著线性相关（P<0.05）。本研究为采用合理的草地刈割强度提供一定的参考和理论依据。

关键词: 晋西北地区, 赖草草地, 刈割强度, 温室气体通量, 主要环境因子

Abstract: In order to investigate the response of greenhouse gas (CO₂,CH₄ and N₂O) fluxes of grassland to different mowing-intensity treatments and optimize the way and intensity of utilization of grassland,a different mowing-intensity experiment was conducted in the leymus secalinus communities of northwestern Shanxi province. We used the static chamber/gas chromatography (GC) technique to investigate the effects of different mowing-intensity treatment (no-mowing,light-mowing,moderate-mowing and heavy-mowing treatment) on three greenhouse gas (CO₂,CH₄ and N₂O) fluxes and the relationship between greenhouse gas fluxes and major environmental factors quantitatively. The results of the growing season and non-growing season in 2017 and 2018 showed that the grassland with different mowing-intensity treatment showed the source of CO₂ and N₂O and the sink of CH₄;mowing significantly affected CH₄ and N₂O fluxes in the growing season of 2018 (P<0.05);the fluxes of the three greenhouse gases were significantly correlated with soil temperature (P<0.05) and the fluxes of CO₂ were significantly linearly correlated with volumetric soil water content and N₂O fluxes (P<0.05). The study provides a certain reference and theoretical basis for adopting reasonable mowing-intensity treatment of grassland.

Key words: Northwestern Shanxi province, Leymus secalinus communities, Mowing intensity, Greenhouse gas fluxes, Major environmental factors

中图分类号:

S812

李超, 常馨, 闫卫东, 董宽虎. 刈割对晋西北赖草草地温室气体通量的影响[J]. 草地学报, 2021, 29(1): 17-24.

LI Chao, CHANG Xin, YAN Wei-dong, DONG Kuan-hu. Effects of Mowing on Greenhouse Gas Fluxes of Leymus secalinus Communities in Northwestern Shanxi Province[J]. Acta Agrestia Sinica, 2021, 29(1): 17-24.

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刈割对晋西北赖草草地温室气体通量的影响

Effects of Mowing on Greenhouse Gas Fluxes of Leymus secalinus Communities in Northwestern Shanxi Province

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