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首页> 外文会议>AWRA's specialty conference on riparian ecology and management in multi-land use watersheds >RIPARIAN ECOSYSTEMS OF NORTH AMERICA'S INTERMOUNTAIN WEST AND ADJACENT PLAINS
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RIPARIAN ECOSYSTEMS OF NORTH AMERICA'S INTERMOUNTAIN WEST AND ADJACENT PLAINS

机译：北美北美洲的河岸生态系统和邻近平原

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Riparian ecosystems in western North America are highly diverse. The wide range of rivers, stream gradients, elevations, and climatic extremes results in riparian heterogeneity. However, similarities in structure and function also result in levels of homogeneity among western riparian systems that allow cross-regional transfer of research findings. Uniformity is represented by cottonwood (Populus), which is common throughout most of western North America. Regional aridity makes most western riparian systems, especially in lower elevations, narrow bands of phreatophytic plant communities along water courses, dependent on supplemental water from alluvial groundwater. As disturbance systems, western riparian communities respond to the highly variable hydrological regimes found throughout the region, such as snowmelt floods and ice in the north, flashy, storm-induced floods in the Southwest, and extended droughts. Most native and non-native riparian plants are adapted to these wide fluctuations, as recruitment is often timed to, or stimulated by, disturbance events. Alterations of regional and local hydrology and land uses, such as reduction of flood magnitudes and modification of watershed vegetation cover, have greatly changed the dynamics of western riparian systems, resulting in decline of ecosystem integrity and functions, and in identification of riparian ecosystems along many western rivers as threatened or endangered.
机译：北美西部的河岸生态系统非常多样化。广泛的河流，流梯度，高度和气候极端导致河岸异质性。然而，结构和功能的相似性也会导致西部河岸系统中均匀性的均匀性水平，允许跨区域转移研究结果。均匀性由Cottonwood（Populus）代表，这在北美大部分地区都很普遍。区域性干旱使大多数西部河岸系统，尤其是沿着水课程的较低海拔，狭窄的心脏病植物社区，依赖于冲积地下水的补充水。作为骚扰系统，西部陆战部社区应对整个地区的高度可变水文制度，如北部的雪花洪水和冰，华而不实的风暴诱导的西南洪水以及延长的干旱。大多数本土和非本地河岸植物适应这些广泛的波动，因为招聘通常是定时的，或受到干扰事件的刺激。区域和局部水文和土地用途的改变，如减少洪水大幅度和分水岭植被覆盖的修改，大大改变了西部河岸系统的动态，导致生态系统完整性和功能的衰落，以及沿着许多人的识别河岸生态系统西方河流受到威胁或濒临灭绝的。

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