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草业学报 ›› 2021, Vol. 30 ›› Issue (2): 115-123.DOI: 10.11686/cyxb2020286

• 研究论文 • 上一篇    下一篇

不同入侵程度喜旱莲子草化学计量特征及其与共存种银花苋的比较

王桔红1(), 许泽璇1, 陈文2, 朱慧1(), 黄龙军1, 李佳维1   

  1. 1.韩山师范学院食品工程与生物科技学院,广东 潮州 521041
    2.韩山师范学院烹饪与酒店管理学院,广东 潮州 521041
  • 收稿日期:2020-06-23 修回日期:2020-09-27 出版日期:2021-02-20 发布日期:2021-01-19
  • 通讯作者: 朱慧
  • 作者简介:E-mail: gdzhuhui@126.com
    王桔红(1963-), 女, 河北无极人, 教授, 博士。E-mail: wjuh1918@163.com
  • 基金资助:
    国家自然科学基金项目(31770584);广东省大学生创新创业项目(S201910578020xian);粤东入侵植物生态研究重点实验室项目(419003)

The stoichiometric characteristics of Alternanthera philoxeroides with different invasive degrees and their comparison with the coexisting species Gomphrena celosioides

Ju-hong WANG1(), Ze-xuan XU1, Wen CHEN2, Hui ZHU1(), Long-jun HUANG1, Jia-wei LI1   

  1. 1.College of Food Technology and Life Science,Hanshan Normal University,Chaozhou 521041,China
    2.School of Culinary Arts and Hospitality Management,Hanshan Normal University,Chaozhou 521041,China
  • Received:2020-06-23 Revised:2020-09-27 Online:2021-02-20 Published:2021-01-19
  • Contact: Hui ZHU

摘要:

外来种入侵使入侵地物种多样性水平下降、生态系统稳定遭到破坏。通过测定不同入侵程度的喜旱莲子草根茎叶以及土壤C、N、P含量及其化学计量比,探查喜旱莲子草各器官化学元素含量及比率的变化;同时,对喜旱莲子草与共存种银花苋化学计量特征进行比较,以揭示喜旱莲子草的营养策略及其成功入侵机制。结果表明:1)随喜旱莲子草的入侵,其生境土壤元素含量增加;土壤速效磷(AP)含量为重度入侵>中度和轻度入侵地,高营养生境尤其是高AP生境有益于喜旱莲子草的快速生长和扩张;2)3种程度入侵的喜旱莲子草各器官N、P含量均为叶>根和茎,植物将更多的N、P元素分配到叶。3)喜旱莲子草各器官N含量、叶P含量均显著大于银花苋,显示其对土壤N、P有较强的吸收和利用率;4)银花苋各器官C∶N值显著大于3种入侵程度的喜旱莲子草各器官;3种入侵程度的喜旱莲子草叶N∶P值显著小于银花苋叶,银花苋根N∶P值、茎N∶P值显著小于3种入侵程度的喜旱莲子草。喜旱莲子草通过对资源的吸收和利用以及地上部分的快速生长增大竞争力,而共存种银花苋主要通过地下部分的快速生长增大竞争力。

关键词: 生态化学计量学, 喜旱莲子草, 银花苋, 营养策略, 入侵性

Abstract:

Invasion by alien species affects the diversity level and the stability of ecosystems. This study explored the nutritional strategy and successful invasion mechanism of Alternanthera philoxeroides with different degrees of invasion (mild, moderate, and heavy invasion) by measuring carbon (C), nitrogen (N), phosphorus (P) contents and their stoichiometry of soils, plant organs and comparing these with a coexisting species, Gomphrena celosioides. It was found that: 1) The element contents in soils increased with alien species invasion. The available phosphorus (AP) content in soil with heavy invasion is higher than the other habitats; 2) N and P contents of A. philoxeroides organs in the three invasive degrees were the leaf>roots and stems, indicating that the elements N and P were more allocated to the leaves; 3) N content in organs, and P content in leaves of A. philoxeroides were significantly higher thanthatof G. celosioides, showing that alien species have strong absorption and utilization of the elements N and P; 4) The C∶P and N∶P ratios of A. philoxeroides leaves were significantly lower than those of G. celosioides, indicating that the growth rate of the invasive species, A. philoxeroides, was higher than that of the companion. The N∶P ratio in roots and stems of A. philoxeroides was greater than G. celosioides. It indicates that invasive plant A. philoxeroides by absorption and utilization of resources, and rapid growth of aboveground parts increases competitiveness, and further expansion.

Key words: ecological stoichiometry, Alternanthera. philoxeroides, Gomphrena celosioides, nutrient strategy, invasive species