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首页> 外文期刊>Journal of Freshwater Ecology >Fragment growth of rooted and rootless submerged aquatic macrophytes: effects of burial modes and decapitation of shoot apex
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Fragment growth of rooted and rootless submerged aquatic macrophytes: effects of burial modes and decapitation of shoot apex

机译：有根和无根淹没水生植物的碎片生长：埋葬方式和茎尖断头的影响

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Some aquatic plant species are fragmented by mechanical forces in their environment. Since these fragments can take root in the sediment and establish new populations, they are important for the establishment success of some aquatic macrophytes. We hypothesized that burial and decapitation of shoot apical meristems would restrict the upward growth of buried fragments. We compared a rooted species (Myriophyllum spicatum L.) with a rootless species (Ceratophyllum demersum L.) in terms of growth of apical and decapitated allofragments buried in sediment in four different modes: buried completely, upper-half buried, lower-half buried, and unburied (floating in the water column). In M. spicatum burial or decapitation of the apex restricted the upward growth of fragments. The greatest growth of apical fragments was in the lower-half buried treatment and the least growth in the upper-half buried treatment. However, completely buried apical fragments did not show decreased growth compared with those in the lower-half buried treatment. All fragments of C. demersum showed vigorous growth (many branches and nodes and high values for biomass and relative growth rate) regardless of the fragment type or burial mode. Our results suggest that the effects of sediment burial are negligible for early regrowth of C. demersum after disturbance by high water flow. However, the pattern of burial in the sediment may adversely affect early regrowth of M. spicatum, especially for fragments without apical tips.
机译：一些水生植物物种在其环境中因机械力而破碎。由于这些碎片可以在沉积物中生根并建立新的种群，因此它们对于某些水生植物的成功建立至关重要。我们假设埋葬和断头的茎尖分生组织会限制埋藏碎片的向上生长。我们以四种不同模式比较了根源和无根物种（麦角藻）的根尖和断头杂物在四种沉积模式下的生长：完全埋藏，上半埋藏，下半埋藏，并且未埋藏（漂浮在水柱中）。在穗状分枝杆菌中，埋葬或切断头顶会限制碎片向上生长。顶端碎片的最大生长在下半埋式治疗中，而最小的增长在上半埋式治疗中。但是，与下半部分埋入式治疗相比，完全埋入式根尖碎片并未显示出生长降低。不论碎片的类型或埋葬方式如何，德美梭菌的所有碎片均显示出旺盛的生长（许多分支和节以及高的生物量和相对增长率）。我们的研究结果表明，在高水流干扰之后，对于C. demersum的早期再生，沉积物埋葬的影响可以忽略不计。但是，沉积物中的埋葬方式可能会对角叉分枝杆菌的早期再生长产生不利影响，特别是对于没有顶端的碎片。

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