等高反坡台阶整地对不同耕作系统根土微生态的影响
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作者单位:

1.西南林业大学生态与环境学院;2.玉溪师范学院化学生物与环境学院

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中图分类号:

S15

基金项目:

国家重点研发计划专题(2022YFF1302904-02);云南省农业联合专项面上项目(202101BD070001-075);云南省基础研究计划面上项目(202001AT070136);云南省青年人才专项(YNWR-QNBJ-2019-215);云南省科技厅青年基金项目(202101AU070008)


Effects of Contoured Reverse-Slope Terrace on the Microecology of Rhizosphere in Different Farming Systems
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College of Ecology and Environment,Southwest Forestry University

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    摘要:

    [目的]为探究坡耕地等高反坡台阶整地对玉米连作和玉米-芸豆轮作系统根土微生态特征的影响。[方法]以玉米-芸豆轮作为研究对象,玉米连作为对照,采用野外原位监测采样和室内试验分析相结合的方法,通过GC-MS和高通量测序技术分析作物根系分泌物和土壤微生物群落组成、结构特征,揭示坡耕地等高反坡台阶整地对玉米连作和玉米-芸豆轮作根系分泌物种类、含量和土壤微生物群落组成及多样性的影响。[结果](1)根系分泌物相对含量变化在CRT措施上更为突出,在轮作模式中更为显著。(2)CRT2处理提高土壤微生物群落数量、丰富度和多样性效果更显著。(3)在根系分泌物与土壤微生物互作下,根系分泌物、土壤微生物、土壤环境因子的两两相关性在CRT2处理下更显著。[结论]综上所述,坡耕地等高反坡台阶整地通过改变玉米连作和玉米-芸豆轮作的根系分泌物含量,使作物根土微生态环境发生变化,提高了土壤微生物数量、多样性及丰富度,且该措施与玉米-芸豆轮作结合的提升效果更佳,对根土微生态的改善作用更显著。以期为坡耕地作物种植、耕作方式选择及改善土壤微环境和水土流失综合治理提供理论基础。

    Abstract:

    [Objective] To examine the impact of contoured reverse-slope terrace (CRT) on the microecological features of the rhizosphere in maize continuous cropping and maize-kidney bean rotation systems. [Method] Four treatments that were established comprise of continuous cropping on undisturbed sloping farmland (CK1), continuous cropping on contoured reverse-slope terrace (CRT1), rotational cropping on undisturbed sloping farmland (CK2), and rotational cropping on contoured reverse-slope terrace (CRT2). The maize-kidney bean rotation wheel was used as the research object, and the maize continuous cropping was used as the control. A combination of field in situ monitoring sampling and indoor experimental analysis was used. The crop root exudates and soil microbial community composition and structural characteristics of were analysed by GC-MS and high-throughput sequencing techniques. To reveal the effects of contoured reverse-slope terrace (CRT) on the species and content of root exudates and the composition and diversity of soil microbial community in maize continuous cropping and maize-kidney bean rotation. [Result] The results of the study showed that, (1) the changes in the relative content of root exudates were more prominent on CRT measures and more significant in the maize-kidney bean rotation. (2) The effect of CRT2 treatment on increasing the number, richness and diversity of soil microbial communities was more significant. (3) The correlation of root exudates, soil microbial community, and soil environmental factors was more significant in the CRT2 treatment than others, that under root exudates-soil microbial community interactions. [Conclusion] Contoured reverse-slope terrace changed the root exudates content of maize continuous cropping and maize-kidney bean rotation, and increased the number, diversity and richness of soil microbial community. And the enhancement effect of this measure in combination with maize-kidney bean rotation was better, and the improvement of root-soil microbial community was more significant. To provide a theoretical basis for growing crops on sloping arable land, choosing farming methods and improving the soil microenvironment and comprehensive management of soil erosion.

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  • 收稿日期:2023-08-30
  • 最后修改日期:2023-10-18
  • 录用日期:2023-10-19
  • 在线发布日期: 2024-02-05
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