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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 >CAN RIPARIAN FOREST BE RESTORED WITHOUT DESTABILIZING STREAM CHANNELS AND DISCREDITING MANAGERS?
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CAN RIPARIAN FOREST BE RESTORED WITHOUT DESTABILIZING STREAM CHANNELS AND DISCREDITING MANAGERS?

机译：是否可以在不破坏流道和取消管理员的情况下恢复RIPARIAN森林？

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摘要

Several studies in the geomorphic literature report that stream reaches in pasture are generally narrower than in forest. Pasture grasses armor stream banks against fluvial scour, and entrap alluvium, so promoting channel narrowing. Under riparian forest, channels are appreciably wider (typically by a factor of two in small streams < 5 m wide). In New Zealand, conversion of formerly pasture land to pine plantations has led to stream bank recession following canopy closure. Eroded bank material has caused sedimentation of the streambed, and the washing of fines has reduced water clarity. Planting of riparian zones is often promoted in order to buffer streams from degradation by pastoral agriculture. However, such planting seems likely to cause channel widening with sedimentation and water quality problems during the channel adjustment phase. These transitional side effects of riparian planting may persist for a few years to decades as the stream channel changes to a forest morphology. Eventually the stream channel can be expected to stabilize with a clean sediment bed and clear water. Channel widening should be explicitly recognized before riparian restoration, so that management efforts are not discredited when stream habitat and water quality decline for a time rather than improve monotonically.
机译：地貌文献中的一些研究报告说，牧场中的河流通常比森林中的狭窄。牧场草的装甲流可以抵御河流冲刷，并截留冲积层，从而促进河道变窄。在河岸森林中，河道明显更宽（在<5 m宽的小溪流中，通常是两倍）。在新西兰，原先的牧场变成了松树种植园，导致了天篷关闭后溪流的衰退。侵蚀的堤岸材料引起了河床的沉淀，细粉的洗涤降低了水的透明度。经常促进沿河带的种植，以缓冲因牧业农业退化而引起的溪流。但是，这种种植似乎可能会在渠道调整阶段引起沉积和水质问题的渠道拓宽。随着河道改变为森林形态，河岸种植的这些过渡性副作用可能会持续数年至数十年。最终，可以预期河道将在干净的沉淀床和清澈的水中稳定下来。在恢复河岸之前，应明确认识到河道拓宽，这样，当河流栖息地和水质下降一段时间时，而不是单调地改善河道管理工作就不会受到损害。

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