Abstract The concentration of oxygen dissolved in water affects aquatic organisms. Unrestrained logging and site preparation can depress dissolved oxygen (DO) concentrations in adjacent streams by elevating temperatures (with removal of riparian shade), impounding channels (reduced reaeration rates), and introducing fresh, oxygen-depleting slash. One of the first paired watershed studies investigating the use of streamside management zones, the Alsea Watershed Study (AWS) in coastal Oregon (1958–1973), highlighted the potential to depress DO concentrations in streams adjacent to harvest units. This and other studies spurred development of Best Management Practices (BMPs) and forest practice rules to maintain, among other things, favorable DO concentrations in streams. A new study of the Alsea watersheds (2006–2015) found little signal of management effects on DO concentrations. It did find that a discontinuously perennial stream (where reaches go subsurface during low flows) can experience naturally low DO concentrations. Forest managers can avoid exacerbating low DO conditions using simple BMPs, but discontinuously perennial forest streams are predisposed to low DO concentrations.

中文翻译：

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了解管理森林内不连续的多年生溪流中的溶解氧浓度

摘要 水中溶解氧的浓度会影响水生生物。无限制的伐木和场地准备可以通过升高温度（去除河岸遮荫）、蓄水通道（降低再通风率）和引入新鲜的耗氧斜线来降低相邻河流中的溶解氧 (DO) 浓度。俄勒冈州沿海地区的 Alsea 流域研究 (AWS)（1958-1973 年）是调查河滨管理区使用情况的首批成对流域研究之一，它强调了降低采伐单位附近河流中溶解氧浓度的潜力。这项研究和其他研究促进了最佳管理实践 (BMP) 和森林实践规则的发展，以保持溪流中有利的溶解氧浓度等。对 Alsea 流域（2006-2015 年）的一项新研究发现，管理对 DO 浓度影响的信号很少。它确实发现不连续的常年溪流（在低流量期间到达地下的地方）可以自然地经历低 DO 浓度。森林管理者可以使用简单的 BMP 避免加剧低 DO 条件，但不连续的多年生森林溪流容易出现低 DO 浓度。