入侵植物南美蟛蜞菊和本土蟛蜞菊生长对土壤养分的响应

发布时间：2018-05-26 23:13

本文选题：土壤养分 + 种间关系　；参考：《生态学杂志》2017年04期

【摘要】：植物入侵对全球生态系统造成了严重威胁,土壤养分条件(养分水平和养分异质性)对外来植物的成功入侵有重要影响。为了探讨土壤养分条件对入侵植物与同属本地植物生长的影响,本研究以入侵植物南美蟛蜞菊(Wedelia trilobata)和同属本地种蟛蜞菊(W.chinensis)为试验材料开展了温室控制实验。实验设置了低、中、高及异质性养分条件下的单种和混种两种种植方式,测定了每种植物总生物量,根、茎、叶生物量及分节数、根冠比等指标,并分析了土壤养分对二者生长的影响。结果表明:土壤养分水平增加显著促进了南美蟛蜞菊和本地蟛蜞菊的生长;土壤养分异质性显著增加了南美蟛蜞菊根生物量和根冠比,显著增加了本地蟛蜞菊的总生物量、根生物量和茎生物量;土壤养分水平和养分异质性对南美蟛蜞菊和本地蟛蜞菊的竞争响应均无显著影响;在土壤养分较高或较低时南美蟛蜞菊更容易入侵成功;在异质养分环境中,当南美蟛蜞菊生长处于高养斑块时更容易入侵成功。
[Abstract]:Plant invasion poses a serious threat to the global ecosystem, and soil nutrient conditions (nutrient levels and nutrient heterogeneity) have an important impact on the successful invasion of exotic plants. In order to investigate the effects of soil nutrient conditions on the growth of invasive plants and native plants of the same genus, greenhouse control experiments were carried out with the invasive plant Wedelia trilobata and the native species Wedelia chinensis. Under the condition of low, medium, high and heterogenous nutrients, two planting methods, single and mixed, were used to measure the total biomass, root, stem, leaf biomass, the number of nodes, the ratio of root to shoot, and so on, in which the total biomass, root, stem, leaf biomass and root / shoot ratio of each plant were measured. The effects of soil nutrients on their growth were also analyzed. The results showed that the increase of soil nutrient level significantly promoted the growth of wedelia chinensis and native wedelia chinensis, and soil nutrient heterogeneity significantly increased the root biomass and root-shoot ratio of wedelia chinensis, and increased the total biomass of native wedelia chinensis Root biomass and stem biomass, soil nutrient levels and nutrient heterogeneity had no significant effect on the competitive response of wedelia chinensis and native wedelia chinensis, and wedelia chinensis was more likely to invade when soil nutrients were higher or lower. In heterogeneous nutrient environment, wedelia chinensis is more likely to invade successfully when it grows in hypertrophic patch.
【作者单位】：北京林业大学自然保护区学院;
【基金】：国家自然科学基金项目(41571084)资助
【分类号】：S158;S45

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