Propagule Pressure, Habitat Conditions and Clonal Integration Influence the Establishment and Growth of an Invasive Clonal Plant, Alternanthera philoxeroides.
Propagule Pressure, Habitat Conditions and Clonal Integration Influence the Establishment and Growth of an Invasive Clonal Plant, Alternanthera philoxeroides.
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繁殖压力、栖息地条件和克隆整合影响入侵克隆植物空心莲子草的建立和生长
DOI：
10.3389/fpls.2016.00568
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发表时间：
2016
影响因子：
5.6
通讯作者：
Du DL
中科院分区：
文献类型：
--
作者：
You WH;Han CM;Fang LX;Du DL
许多臭名昭著的入侵植物是无性繁殖的，主要通过营养繁殖体传播。压力（繁殖体的数量）可能会影响这些克隆植物的建立，生长，从而入侵成功，这种影响也可能取决于生境条件。为了了解繁殖体压力、生境条件和克隆整合对入侵克隆植物的建立和生长的影响，在温室中对一种入侵克隆植物空心莲子草进行了为期8周的试验。高（五个片段）或低（一个片段）的繁殖体压力建立在裸露的土壤（开放的栖息地）或密集的原生植被Jussiaea repens（营养栖息地），与匍匐茎连接切断或连接到相对较老的分株。高的繁殖压力大大促进了A.喜旱莲子草，特别是当它生长在植物栖息地。令人惊讶的是，高繁殖体压力显著降低了A.在开放生境中，对喜旱莲子草的生长有显著影响，而在营养生境中，对喜旱莲子草的生长无明显影响。在A.可能是空心莲子草从开放生境的竞争向营养生境的促进转变的主要原因。此外，克隆整合显著提高了A.在低繁殖压力条件下，喜旱莲子草的生长和竞争能力均未受到影响。无性系整合可能是喜旱莲子草在植物生境中的重要作用。为空心莲子草开辟新的传播空间。这些结果表明，繁殖体压力可能是至关重要的入侵成功。喜旱莲子草，这种影响也取决于生境条件。
Many notorious invasive plants are clonal, spreading mainly by vegetative propagules. Propagule pressure (the number of propagules) may affect the establishment, growth, and thus invasion success of these clonal plants, and such effects may also depend on habitat conditions. To understand how propagule pressure, habitat conditions and clonal integration affect the establishment and growth of the invasive clonal plants, an 8-week greenhouse with an invasive clonal plant, Alternanthera philoxeroides was conducted. High (five fragments) or low (one fragment) propagule pressure was established either in bare soil (open habitat) or dense native vegetation of Jussiaea repens (vegetative habitat), with the stolon connections either severed from or connected to the relatively older ramets. High propagule pressure greatly increased the establishment and growth of A. philoxeroides, especially when it grew in vegetative habitats. Surprisingly, high propagule pressure significantly reduced the growth of individual plants of A. philoxeroides in open habitats, whereas it did not affect the individual growth in vegetative habitats. A shift in the intraspecific interaction on A. philoxeroides from competition in open habitats to facilitation in vegetative habitats may be the main reason. Moreover, clonal integration significantly improved the growth of A. philoxeroides only in open habitats, especially with low propagule pressure, whereas it had no effects on the growth and competitive ability of A. philoxeroides in vegetative habitats, suggesting that clonal integration may be of most important for A. philoxeroides to explore new open space and spread. These findings suggest that propagule pressure may be crucial for the invasion success of A. philoxeroides, and such an effect also depends on habitat conditions.