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首页> 外文会议>AWRA's 2000 Summer Specialty Conference on Riparian Ecology and Management in Multi-Land USE Watersheds Aug 28-31, 2000 Portland, Oregon >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：北美中西部和邻近平原的RIPARIAN生态系统

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摘要

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高度多样化。宽泛的河流，溪流坡度，海拔和气候极端因素导致河岸异质性。但是，结构和功能上的相似性也导致西方河岸系统之间的同质性水平，从而允许跨地区转移研究结果。均匀性以杨木（杨）为代表，杨木在北美西部大部分地区都很常见。区域干旱使大多数西部河岸系统（尤其是在低海拔地区，沿水道的植物植物群落的狭窄带）依赖于冲积地下水的补充水。作为扰动系统，西部河岸社区对整个地区发现的高度变化的水文状况作出反应，例如北部的融雪洪水和冰冻，西南部的暴雨，暴雨引发的洪水以及持续的干旱。大多数招募的当地和非本地河岸植物都适应了这些大范围的波动，因为征募通常是定时进行的，或者是受干扰事件刺激的。区域和地方水文学和土地利用的变化，如洪水泛滥的减少和流域植被的改变，极大地改变了西部河岸系统的动态，导致生态系统完整性和功能下降，并导致沿河生态系统的识别西部河流受到威胁或濒危。

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