不同盖度金露梅灌丛草本植物叶性状与环境因子间的关系
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1.中国科学院西北高原生物研究所;2.青海省西宁市城西区新宁路23号西北高原生物研究所

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青海省重点研发与转化计划项目(2019-SF-152);青海省重大科技专项(2018-NK-A3);中国科学院科技服务网络计划(STS计划)区域重点项目“敦煌洪水资源化利用与生态治理试验示范”;国家自然科学基金项目(41730752);青海省创新平台建设专项(2017-ZJ-Y20);青海省应用基础研究计划项目(2019-ZJ-7073)


Relationship between Leaf Functional Traits of Herbaceous Plants and Soil Factors under Different Coverage Gradients of Potentilla fruticosa shrub
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    摘要:

    植物功能性状与环境因子的研究对认识不同环境梯度下植物群落的形成及对环境的适应机制具有重要意义。以高寒金露梅灌丛(Potentilla fruticosa)草甸为研究对象,研究金露梅盖度分布梯度下灌草斑块中草本植物叶功能性状与土壤因子的变化趋势及相关关系。研究结果表明:(1)土壤容重(BD)、土壤pH和土壤养分在金露梅灌丛盖度梯度下差异显著,干柴滩金露梅灌丛具有明显的“沃岛效应”。随着金露梅灌丛盖度的递增,土壤理化性质变化趋势各有分异。(2)随着金露梅灌丛盖度的增加,比叶面积(SLA)显著上升,叶片厚度(LT)和叶片磷含量(LPC)呈显著下降趋势(P<0.05)。(3)比叶面积与叶片厚度呈负相关,与叶片氮磷含量(LNC、LPC)呈极显著负相关(P<0.01),与叶片碳含量(LCC)呈极显著正相关(P<0.01)。(4)RDA冗余分析表明土壤因子对叶功能性状变异的平均解释变量达72.25%,影响植物功能性状的主导因子有土壤有机质(SOM)、土壤全氮(TN)、土壤有效氮(AN)、土壤有效钾(AK)和土壤容重(BD),但不同盖度金露梅灌丛群落中影响叶性状的主导因子存在差异。盖度较小(0%和30%)时,主要受SOM和TN、AN影响较大,而盖度较大时(60%和90%),主要受AK和BD影响。

    Abstract:

    The study of plant functional traits and environmental factors is great significance for understanding the formation of plant community and its adaptation mechanism under different environmental gradients.Therefore, we aimed to study the changes characteristics and correlation between the leaf functional traits of herbaceous plants and soil factors under different coverage gradients of Potentilla fruticosa shrub. Our research indicates that (1) There were significant differences and different variation trends among soil bulk density (BD), soil pH, and soil nutrients under different coverage gradients of Potentilla fruticosa shrub. And Potentilla fruticosa shrub in the study area has obvious " Fertile Island effect Potentilla fruticosa shrub overage, the specific leaf area (SLA) increased significantly, and leaf thickness (LT) and leaf phosphorus content (LPC) decreased significantly (P <0.05). The difference of LPC may be related to the element content of different species in the community. (3) SLA is negatively correlated with leaf dry matter content (LDMC) and LT to varying degrees, and is extremely significantly negatively related to leaf nitrogen and phosphorus content (LNC, LPC) (P <0.01), and significantly positively correlated with leaf carbon content (LCC) (P<0.01). (4) RDA redundancy analysis showed that he average explanatory variable of soil factors to leaf functional traits variation was 72.25%, and the dominant factors affecting plant functional traits were soil organic matter (SOM), soil total nitrogen (TN), soil available nitrogen (AN), and soil available potassium (AK) and soil bulk density (BD). However, with different cover distributions of Potentilla fruticosa shrub, the dominant factors affecting plant leaf traits are different in different communities. Communities with 0% and 30% coverage of Potentilla fruticosa shrubs were more affected by SOM, TN, and AN, while the communities with 60% and 90% of Potentilla fruticosa shrubs were more affected by AK and BD.

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  • 收稿日期:2019-12-29
  • 最后修改日期:2020-04-28
  • 录用日期:2020-03-25
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