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首页> 外文期刊>Landscape and Urban Planning >Simulating riparian vegetation and aquatic habitat dynamics in response to natural and anthropogenic disturbance regimes in the Upper Grande Ronde River, Oregon, USA.
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Simulating riparian vegetation and aquatic habitat dynamics in response to natural and anthropogenic disturbance regimes in the Upper Grande Ronde River, Oregon, USA.

机译：在美国俄勒冈州上大朗德河上游，模拟河岸植被和水生栖息地动态，以响应自然和人为干扰因素。

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We developed state and transition models (STMs) to evaluate the effects of natural disturbances and land-use practices on aquatic and riparian habitats. The STMs consisted of discrete states defined by channel morphology and riparian vegetation. Transitions between states resulted from plant succession and from natural and anthropogenic disturbances. Channel conditions and habitat suitability for anadromous salmonids were ranked by using a qualitative four-factor scale for each state in the STMs. Disturbance probabilities were varied to define both historical and current disturbance regimes. Models were run for 120 years with the current disturbance regime to illustrate changes associated with Euro-American settlement, and then run for an additional 50 years under the historical disturbance regime to illustrate the potential for passive recovery. Results suggested that Euro-American settlement dramatically changed riparian vegetation and channel conditions, which resulted in substantial declines in habitat quality. Passive recovery of channel conditions and habitat suitability was quick in some stream types, but slow in others. Overall, our results underestimate the effects of human land uses on streams and overestimate the rate of recovery under passive restoration because the models do not yet include the effects of many management activities, especially those resulting from forest harvest and roads.
机译：我们开发了状态和过渡模型（STM），以评估自然干扰和土地利用实践对水生和河岸生境的影响。 STM包含由通道形态和河岸植被定义的离散状态。国家之间的过渡是由于植物演替以及自然和人为干扰造成的。通过使用STM中每个州的定性四因素量表，对淡水鲑鱼的航道条件和栖息地适应性进行了排名。扰动概率不同，以定义历史和当前扰动范围。在当前的扰动制度下，模型运行了120年，以说明与欧美定居有关的变化，然后在历史扰动制度下，模型又运行了50年，以说明被动恢复的潜力。结果表明，欧美定居点极大地改变了河岸植被和河道条件，从而导致栖息地质量大大下降。在某些溪流类型中，河道条件的被动恢复和生境适应性的恢复较快，而在另一些溪流类型中，恢复较慢。总体而言，我们的结果低估了人类土地利用对河流的影响，并高估了被动恢复下的恢复速度，因为这些模型尚未包括许多管理活动的影响，尤其是那些森林采伐和道路造成的影响。

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