有机肥对羊草营养生长期功能性状变化的影响
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1.铜仁学院农林工程与规划学院;2.中国农业科学院农业资源与农业区划研究所;3.呼伦贝尔市农牧业技术推广中心;4.呼伦贝尔市农畜产品质量安全中心

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国家重点研发计划项目(2021YFF0703904)、农业科技创新联盟建设-农业基础性长期性科技工作(NAES037SQ18)、中央级公益性科研院所基本科研业务费专项(1610132021016)、呼伦贝尔市“科技兴市”行动重点专项(2021hzzx03)、内蒙古自治区科技计划项目(2022YFDZ0019)、铜仁学院博士科研启动(trxyDH1706)


Effects of organic fertilizers on changes of functional traits of Leymus chinensis in vegetative growth period
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    摘要:

    本文研究不同有机肥水平下羊草(Leymus chinensis)营养生长期功能性状的变化规律、响应机制及其相关性的变化,试图为资源环境与植物功能性状的动态研究和草地生态系统的恢复提供参考。结果显示:(1)有机肥会使羊草叶长、叶面为了探讨不同有机肥施用水平下羊草(Leymus chinensis)营养生长期功能性状的变化规律、响应机制及其相关性的变化,为资源环境与植物功能性状的动态研究和草地生态系统的恢复提供参考。选择中国农业科学院呼伦贝尔草原生态系统国家野外科学观测研究站附近,割草利用超过20 a未施用过肥料的固定草场作为试验场地,围封并划分若干小区,设置对照以及低、中、高4个有机肥施用水平(有N效养分用量分别为0、 63、127和 190 kg/hm2),在羊草主要营养生长的前、中、后期采集样品,测定相关功能性状。分别采用二次曲线方程拟合、单因素多元方差分析、Pearson相关分析和积分(逐步)回归等方法分析羊草功能性状的变化趋势、差异性、相关性及影响系数。结果显示:(1)有机肥会使羊草叶长、叶面积、自然叶宽、展开叶宽、比叶面积、茎长、茎质量、株高由先升后降的变化趋势变为逐渐增加的趋势,同时使叶干物质含量和茎干物质含量有所下降;(2)有机肥会改变羊草功能性状之间的相关性,增强叶面积与比叶面积、茎长与茎质量、茎长与单株质量的相关性,降低叶质量与单株质量、叶宽与株高的相关性;(3)有机肥会改变羊草表型性状(叶、茎、株高)对单株质量的贡献率,随施肥水平的提高,叶、茎、株高的贡献率逐渐趋于均衡。羊草表型性状影响单株质量的大小顺序为叶性状>株高>茎性状。研究发现,短期施用有机肥对羊草功能性状变化影响显著,且作用效果主要发生在羊草营养生长后期,尤其对单株质量提升效果显著。叶长、展开叶宽、叶面积、株高对羊草单株质量影响较大,其中株高是驱动羊草单株质量变化的最稳定因子。同时,羊草功能性状之间的相关性也受施肥水平的影响,施肥在增强部分功能性状相关性的同时减弱了其他性状之间的相关性,整体存在着一定的平衡。

    Abstract:

    This paper studied the changes, response mechanism and correlation of functional traits of Leymus chinensis during vegetative growth period under different levels of organic fertilizer, in an attempt to provide reference for the dynamic study of resources, environment and plant functional characters and the restoration of grassland ecosystem. The changing trend, difference, correlation and influence coefficient of functional characters of Leymus chinensis were analyzed by conic equation fitting, single factor multivariate analysis of variance, Pearson correlation analysis and integral (stepwise) regression. The results show that (1) Organic fertilizer could increase the leaf length, leaf area, natural leaf width, unfolded leaf width, specific leaf area, stem length, stem mass, and single plant mass of L. chinensis sativus from increasing at first and then decreasing. At the same time, the content of leaf dry matter and stem dry matter decreased. (2) Organic fertilizer could change the correlation among functional characters of Leymus chinensis, enhance the correlation between leaf area and specific leaf area, stem length and stem mass, and stem length and single plant mass, decrease the correlation between single leaf mass and single plant mass, leaf width and plant height. (3) Organic fertilizer could change the contribution rate of Leymus chinensis phenotypic traits (leave, stem, and plant height) to the single plant mass, and with the increase of fertilization level, the contribution rates of leave, stem and plant height tends to be balanced. The order of phenotypic traits affecting single plant mass of L. chinensis was leaf trait > plant height > stem trait. It was found that short-term application of organic fertilizer had a significant effect on the functional characters of Leymus chinensis, and the effect mainly occurred in the later stage of vegetative growth of Leymus chinensis, especially on the single plant mass. Among them, leaf length, unfolding leaf width, leaf area and plant height have great influence on the single plant mass of Leymus chinensis, while plant height is the most stable factor driving the change of single plant mass of Leymus chinensis. At the same time, the correlation between functional characters of Leymus chinensis was also affected by the level of fertilization. Fertilization not only enhanced the correlation of some functional traits, but also weakened the correlation among other traits, and there was a certain balance as a whole.

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代景忠,闫瑞瑞,张小英,等.有机肥对羊草营养生长期功能性状变化的影响[J].西北植物学报,2024,44(2):194-204

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  • 收稿日期:2023-08-21
  • 最后修改日期:2023-11-15
  • 录用日期:2023-11-20
  • 在线发布日期: 2024-01-25
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