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首页> 外文期刊>Estuarine Coastal and Shelf Science >Inter-specific competition: Spartina alterniflora is replacing Spartina anglica in coastal China
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Inter-specific competition: Spartina alterniflora is replacing Spartina anglica in coastal China

机译：种间竞争：互花米草替代中国沿海的互花米草

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摘要

Spartina anglica C. E Hubbard, an invasive species world wide, underwent rapid invasion before the 1990s and followed by a drastic decline in costal China since its first introduction from Europe in 1963. It was hypothesized that the competition with Spartina alterniflora LoiseL, introduced into China in 1979, might play an important role in this decline due to their overlapping niche existed in the field. In this paper, we evaluated relative competitive ability using the Relative Neighbour Effect (RNE) index and the growth responses of the two species under both independent and mixed planting experiments. Several performance indices, including culm height, as well as above-ground, below-ground and spike biomass, were significantly higher in S. alterniflora than S. anglica. The relative inter-specific competitive ability of S. alterniflora was significantly greater than that of S. anglica and S. alterniflora exerted an asymmetric, competitive dominance over S. anglica. The competition remarkably reduced several performance parameters in S. anglica including: above-ground biomass, culm height, stalk diameter, number of leaves, number of roots, max root length, leaf area, leaf thickness; numbers of ramets, rhizomes, internodes of total rhizomes, vegetative tillers (and consequently total tillers), and total length of rhizomes. This substantial growth advantage of S. alterniflora might explain its greater interspecific competitive ability, and suggests a mechanism by which S. alterniflora has been able to replace S. anglica and quickly invade the natural salt marsh communities of coastal China.
机译：Spartina anglica C. E Hubbard是世界范围内的入侵物种，在1990年代之前经历了快速入侵，随后自1963年从欧洲首次引入沿海以来，沿海中国急剧下降。据推测，与互花米草（Spartina alterniflora LoiseL）的竞争引入了1979年的中国在这一衰落中可能发挥重要作用，因为它们在该领域存在着重叠的利基市场。在本文中，我们使用相对邻居效应（RNE）指数和在独立和混合种植实验下两种物种的生长响应来评估相对竞争能力。互花米草中的几个性能指标，包括茎高，地上，地下和穗状生物量，均显着高于英国菊。互花米草的相对种间竞争能力显着大于英国链球菌，而互花米草对沙门氏菌具有不对称的竞争优势。竞争显着降低了英国链球菌的几个性能参数，包括：地上生物量，茎秆高度，茎杆直径，叶片数，根数，最大根长，叶面积，叶片厚度；分株，根茎的数量，总根茎的节间数，无性分and（因此也有总分ers）以及根茎的总长度。互花米草的这种显着的生长优势可能解释了其更大的种间竞争能力，并提出了互花米草能够替代英国链球菌并迅速入侵中国沿海天然盐沼群落的机制。

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