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首页> 外文期刊>Wetlands >Recovery Succession of Native Plant Communities at Big Meadow Bog After Disturbance and Eutrophication from Herring Gulls
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Recovery Succession of Native Plant Communities at Big Meadow Bog After Disturbance and Eutrophication from Herring Gulls

机译：鲱鸥的干扰和富营养化之后，大草甸沼泽地原生植物群落的恢复演替

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On Brier Island in eastern Canada, ditching of Big Meadow Bog resulted in predictable shifts in the plant community as shrubs and trees proliferated across the drained landscape. The attraction of nesting gulls to the ditched bog and their daily foraging at distant mink farms was not predictable. To better understand the impacts of the nesting gulls, we performed a retrospective analysis of plant community disruption and recovery succession. Areas of gull-bared peat within Big Meadow Bog were colonized in succession by exotic grasses (e.g. Holcus lanatus) and annuals; raspberry (Rubus spp.) canes and biotically-dispersed Rosaceae shrubs; and wind-dispersed Ericaceae, fern, and tree species. There was no evidence of a persisting bog-species seedbank in the soil to aid post-gull revegetation, nor was there evidence of an exotic-weed seedbank to interfere with plant-community regeneration. The exotic-weed seedbank (6 thousand seeds m(-2)) declined to zero after 33years (half-life=3.6years). In contrast, a secondary, native (mainly Juncus spp.) seedbank of similar magnitude, persisted. The recovered plant communities had swamp features (i.e., trees, ferns, tall shrubs). Whether or not Big Meadow Bog regains ombrotrophy will depend upon whether blocked ditches and reinstated water tables deter nesting gulls.
机译：在加拿大东部的Brier岛上，大灌木丛沼泽的开挖导致灌木丛和树木在排水环境中扩散，导致植物群落发生可预见的变化。无法预测嵌套海鸥对沟渠的吸引力以及它们在遥远的水貂农场的日常觅食。为了更好地了解筑巢鸥的影响，我们对植物群落的破坏和恢复演替进行了回顾性分析。大草甸沼泽内的裸露的泥炭地区被异国草（例如Holcus lanatus）和一年生植物连续定殖；覆盆子（Rubus spp。）甘蔗和生物分散的蔷薇科灌木；以及风散散的蓖麻科，蕨类和树木。没有证据表明土壤中的沼泽物种种子库持续存在，以帮助海鸥恢复植被，也没有证据表明外来杂草的种子库会干扰植物群落的再生。 33年（半衰期= 3.6年）后，外来杂草种子库（6000种子m（-2））降至零。相比之下，具有相似大小的次生原生（主要是Juncus spp。）种子库仍然存在。恢复的植物群落具有沼泽特征（即树木，蕨类，高大的灌木丛）。大草原沼泽（Big Meadow Bog）是否能恢复原状，将取决于被堵塞的沟渠和恢复的地下水位是否能阻止巢鸥。

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