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首页> 外文期刊>San Francisco Estuary and Watershed Science >Estuarine Vegetation at Rush Ranch Open Space Preserve, San Franciso Bay National Estuarine Research Reserve, California
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Estuarine Vegetation at Rush Ranch Open Space Preserve, San Franciso Bay National Estuarine Research Reserve, California

机译：加利福尼亚旧金山湾国家河口研究保护区Rush Ranch开放空间保护区的河口植被

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The Rush Ranch Open Space Preserve (Rush Ranch) is located at the northwestern edge of the Potrero Hills and includes the largest remaining undiked tidal wetland within the Suisun Marsh region of the San Francisco Estuary. The brackish tidal wetlands grade into the transitional vegetation and undeveloped grasslands of the Potrero Hills, and we describe diverse vegetation that reflects the estuarine position, land use history, and hydrogeomorphic complexity of the site. We present a useful framework for future study of vegetation at this San Francisco Bay National Estuarine Research Reserve site. Rush Ranch includes four major estuarine geomorphic units that are widely distributed in the region and support vegetation: subtidal channel beds, fringing tidal marsh, tidal marsh plain and tidal marsh–terrestrial ecotone. These are distinguished by small variations in hydrology and elevation, as noted and described through field observations and historic vegetation-mapping data. We discuss vegetation within each of these landforms, considering each vegetation community as a function of changing physical environment and biological interactions. Past land use and exotic plant species invasions have substantially altered Rush Ranch's tidal marsh vegetation patterns. Our results indicate 27% of the current estuarine wetland-associated flora at Rush Ranch are exotic species, and several are highly invasive. Despite these influences, Rush Ranch’s position in the landscape provides important and increasingly rare habitat linkages between the tidal marsh and upland grasslands, which allows great potential for restoration and enhancement. We present a detailed flora and vegetation analysis by hydrogeomorphic setting to provide an ecological framework for future monitoring, research, and adaptive conservation management at Rush Ranch.
机译：拉什牧场休憩用地保护区（Rush Ranch）位于Potrero Hills的西北边缘，包括旧金山河Suisun沼泽地区内最大的未堤防潮汐湿地。淡淡的潮汐湿地分为Potrero Hills的过渡植被和未开发的草原，我们描述了反映出河口位置，土地使用历史和该地点水文地貌复杂性的多样化植被。我们在此旧金山湾国家河口研究保护区站点上提供了一个有用的框架，供将来研究植被。拉什牧场包括四个主要的河口地貌单元，广泛分布在该地区并支持植被：潮下河床，潮汐边缘沼泽，潮汐平原和潮汐—陆生过渡带。如实地观察和历史植被测绘数据所指出和描述的，这些地区的特征是水文和海拔高度的微小变化。我们讨论了每种地形中的植被，并将每个植被群落视为不断变化的物理环境和生物相互作用的函数。过去的土地利用和外来植物物种的入侵已大大改变了拉什牧场的潮汐沼泽植被格局。我们的结果表明，拉什牧场目前与河口湿地相关的植物有27％是外来物种，其中一些具有高度入侵性。尽管有这些影响，拉什牧场在景观中的位置仍然为潮汐沼泽和高地草原之间提供了重要且日益稀有的栖息地联系，这为恢复和改善提供了巨大的潜力。我们通过水文地貌环境介绍了详细的植物和植被分析，为Rush Ranch的未来监测，研究和适应性保护管理提供了生态框架。

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