We evaluated the ecological effectiveness of an in-stream restoration project involving coarse woody debris (CWD) additions to streams along an upland soil and vegetation disturbance gradient at the Fort Benning Military Installation near Columbus, GA. We examined short-term (immediate effectiveness) and longer-term (sustainability) responses to CWD additions by measuring ecosystem metabolism rates in 8 streams quarterly over a 6-year period, including 3 years before (2001–2003) and 3 years after (2004–2006) CWD additions that were made to half of the streams. Ecosystem respiration (ER) rates in most CWD addition streams increased relative to control streams from spring 2004 through autumn 2005, suggesting heterotrophic bacteria were the initial responders to CWD additions. Gross primary production (GPP) rates remained low (typically < 0.3 g O₂ m⁻² d⁻¹) but increased in some CWD addition streams relative to control streams in spring 2004 and 2005. The magnitude of ER increases in CWD addition streams during the first two years post-addition increased with catchment disturbance intensity, indicating that more heavily disturbed streams responded most strongly to restorations—an important consideration when targeting future restoration locations. Because restorations did not address actual upland disturbance, continued high erosion rates resulted in 32–77% of the added CWD being buried by year two and a corresponding return of GPP and ER rates to pre-CWD addition levels by year three. If restoration projects do not adequately address the source of catchment disturbances, CWD additions will provide only short-term increases in streambed structure and stability, hydrodynamic complexity, and nutrient and organic matter processing and retention.

我们在乔治亚州哥伦布附近的本宁堡军事设施评估了一个河内恢复项目的生态有效性，该项目涉及沿高地土壤和植被干扰梯度向溪流中添加粗木屑 (CWD)。我们通过在 6 年期间（包括 3 年前（2001-2003）和之后 3 年）每季度测量 8 个溪流中的生态系统代谢率，研究了对 CWD 添加的短期（即时有效性）和长期（可持续性）响应。 2004–2006) 对一半的流进行了 CWD 添加。从 2004 年春季到 2005 年秋季，大多数 CWD 添加流中的生态系统呼吸 (ER) 率相对于对照流增加，表明异养细菌是 CWD 添加的最初响应者。初级生产总值 (GPP) 率仍然很低（通常 < 0.3 g O₂ m ^-2 d ^-1) 但在 2004 年和 2005 年春季，一些 CWD 添加流相对于控制流增加。添加后前两年 CWD 添加流的 ER 增加幅度随集水区扰动强度而增加，表明更严重扰动的溪流响应最强烈修复——在定位未来修复位置时的一个重要考虑因素。由于修复并未解决实际的高地干扰，持续的高侵蚀率导致 32-77% 的增加的 CWD 在第二年被掩埋，并且 GPP 和 ER 率到第三年相应地恢复到 CWD 之前的添加水平。如果恢复项目不能充分解决集水区干扰源，CWD 的添加只会在河床结构和稳定性、水动力复杂性、