The Aquatic Conservation Strategy of the Northwest Forest Plan
The Aquatic Conservation Strategy of the Northwest Forest Plan
复制标题
西北森林规划水生保护策略
DOI：
10.1111/j.1523-1739.2006.00380.x
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发表时间：
2006
影响因子：
6.3
通讯作者：
K. Gallo
中科院分区：
文献类型：
--
作者：
G. Reeves;Jack E. Williams;K. Burnett;K. Gallo
摘要：1994年实施的西北森林计划水生保护战略旨在恢复和维持西北太平洋西部联邦土地上水生和河岸保护区的生态过程。我们使用决策支持模型定量评价选定流域条件的变化。在战略实施后的大约10年里，流域状况得分变化不大，但在250个采样流域中，64%的流域状况有所改善，28%的流域状况有所下降，7%的流域状况保持相对不变。下降幅度最大的流域包括一些野火烧毁了30-60%面积的流域。然而，病情评分的总体统计分布没有明显变化。流域条件的增加大部分与河岸条件的改善有关。大树的数量（胸围直径为50 ~ 51 cm）增加了2 ~ 4%，树木采伐和溪流沿线的其他干扰显著减少。这些变化是否会转化为更大范围内水生生态系统的长期改善还有待观察。
Abstract: Implemented in 1994, the Aquatic Conservation Strategy of the Northwest Forest Plan was designed to restore and maintain ecological processes for aquatic and riparian area conservation on federal lands in the western portion of the Pacific Northwest. We used decision support models to quantitatively evaluate changes in the condition of selected watersheds. In the approximately 10 years since strategy implementation, watershed condition scores changed modestly, but conditions improved in 64% of 250 sampled watersheds, declined in 28%, and remained relatively the same in 7%. Watersheds that had the largest declines included some where wildfires burned 30–60% of their area. The overall statistical distribution of the condition scores did not change significantly, however. Much of the increase in watershed condition was related to improved riparian conditions. The number of large trees (>51 cm diameter at breast height) increased 2–4%, and there were substantial reductions in tree harvest and other disturbances along streams. Whether such changes will translate into longer‐term improvements in aquatic ecosystems across broader landscapes remains to be seen.