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首页> 外文期刊>Natural areas journal >Tree Encroachment Of A Sawgrass (cladium Jamaicense) Marsh Within An Increasingly Urbanized Ecosystem
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Tree Encroachment Of A Sawgrass (cladium Jamaicense) Marsh Within An Increasingly Urbanized Ecosystem

机译：日益城市化的生态系统中锯齿草（Jamaicense沼泽）的树木入侵

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Fire suppression and altered water drainage often change community structure and species composition in human-dominated ecosystems. We describe the decline of sawgrass marshes between 1940 and 2002, and assess the current condition of remnant marshes within the MacKay Tract, an isolated wetland embedded within rapidly developing eastern Orlando, Florida. We tested the correlation between live sawgrass and presence of adult hardwood trees and seedlings (primarily red maple, Acer rubrum) and describe vegetation in plots with different levels of tree encroachment. Total area occupied by open sawgrass in the MacKay Tract has declined dramatically the last 60 years; in 2006, open sawgrass comprised only 12% of the area covered in 1940. Tree basal cover was negatively associated with live sawgrass and positively related to red maple seedling density, but not associated with dead sawgrass tussocks. Sawgrass was positively correlated with the second axis of a non-metric multidimensional scaling ordination on understory plant assemblage, while red maple seedlings and several species associated with disturbed areas were significantly negatively correlated with this axis. Another nine plant species were positively correlated with the first axis, while Osmunda cinnamomea (cinnamon fern) was negatively associated with it. We suggest that woody species are continuing to colonize what is left of the sawgrass marsh. Without intervention (e.g., restoring hydrologic flow and fire), the sawgrass {Cladium jamaicense Crantz) area within the marsh will continue being replaced by woody and exotic species.
机译：灭火和排水方式的改变通常会改变人类主导的生态系统中的群落结构和物种组成。我们描述了1940年至2002年锯木沼泽的减少，并评估了MacKay地带内残留的沼泽地的现状，MacKay地带是佛罗里达州奥兰多东部快速发展的一个孤立湿地。我们测试了活锯草与成年硬木树和幼苗（主要是红枫，红槭）的存在之间的相关性，并描述了不同树种侵占程度的地块中的植被。在过去的60年中，麦凯地区的开放锯齿草所占的总面积急剧下降。在2006年，开放的锯齿草仅占1940年覆盖面积的12％。树木的基层覆盖与活锯齿草呈负相关，与红枫树苗密度呈正相关，但与枯死的锯齿草丛不相关。锯齿草与底层植物组合的非度量多维缩放排序的第二轴呈正相关，而红枫树幼苗和与受干扰区域相关的几种物种与该轴显着负相关。另外九种植物物种与第一轴呈正相关，而Osmunda cinnamomea（肉桂蕨）与第一轴呈负相关。我们建议，木本物种正在继续定居锯草沼泽剩余的东西。在没有干预的情况下（例如恢复水文流动和火灾），沼泽内的锯齿草（Cladium jamaicense Crantz）地区将继续被木本和外来物种取代。

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