Protection of coastal ecosystems from deforestation may be the best way to protect coral reefs from sediment runoff. However, given the importance of generating economic activities for coastal livelihoods, the prohibition of development is often not feasible. In light of this, logging codes of practice have been developed to mitigate the impacts of logging on downstream ecosystems. However, no studies have assessed whether managed land‐clearing can occur in tandem with coral reef conservation goals. This study quantifies the impacts of current land use and the risk of potential logging activities on downstream coral reef condition and fisheries using a novel suite of linked land‐sea models, using Kolombangara Island in the Solomon Islands as a case study. Further, we examine the ability of erosion reduction strategies stipulated in logging codes of practice to reduce these impacts as clearing extent increases. We found that with present‐day land use, reductions in live and branching coral cover and increases in turf algae were associated with exposure to sediment runoff from catchments and log ponds. Critically, reductions in fish grazer abundance and biomass were associated with increasing sediment runoff, a functional group that accounts for ~25% of subsistence fishing. At low clearing extents, although best management practices minimize the exposure of coral reefs to increased runoff, it would still result in 32% of the reef experiencing an increase in sediment exposure. If clearing extent increased, best management practices would have no impact, with a staggering 89% of coral reef area at risk compared to logging with no management. Synthesis and applications. Assessing trade‐offs between coastal development and protection of marine resources is a challenge for decision makers globally. Although development activities requiring clearing can be important for livelihoods, our results demonstrate that new logging in intact forest risks downstream resources important for both food and livelihood security. Importantly, our approach allows for spatially explicit recommendations for where terrestrial management might best complement marine management. Finally, given the critical degradation feedback loops that increased sediment runoff can reinforce on coral reefs, minimizing sediment runoff could play an important role in helping coral reefs recover from climate‐related disturbances.

中文翻译：

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随着土地清理的增加，最佳实践林业管理为珊瑚礁带来收益递减

保护沿海生态系统免受森林砍伐可能是保护珊瑚礁免受沉积物径流影响的最佳方式。然而，考虑到为沿海生计开展经济活动的重要性，禁止开发通常是不可行的。有鉴于此，已经制定了伐木行为守则以减轻伐木对下游生态系统的影响。然而，没有研究评估管理的土地清理是否可以与珊瑚礁保护目标同时发生。本研究以所罗门群岛的科隆班加拉岛为例，使用一套新的陆海模型，量化了当前土地利用和潜在伐木活动对下游珊瑚礁状况和渔业的影响。更多，我们研究了伐木行为规范中规定的侵蚀减少策略在清除范围增加时减少这些影响的能力。我们发现，在当今的土地利用中，活珊瑚和分枝珊瑚覆盖的减少以及草坪藻类的增加与暴露于集水区和原木池塘的沉积物径流有关。至关重要的是，鱼类食草动物丰度和生物量的减少与沉积物径流的增加有关，沉积物径流占生存捕捞的约 25%。在低净度范围内，尽管最佳管理实践将珊瑚礁暴露于增加的径流中的风险降至最低，但仍会导致 32% 的珊瑚礁遭受沉积物暴露的增加。如果清理范围增加，最佳管理实践将没有影响，与没有管理的伐木相比，89% 的珊瑚礁区域处于危险之中。合成与应用。评估沿海开发和海洋资源保护之间的权衡是全球决策者面临的挑战。尽管需要清理的开发活动对生计很重要，但我们的结果表明，对完整森林的新伐木会危及对粮食和生计安全都很重要的下游资源。重要的是，我们的方法允许为陆地管理可能最好地补充海洋管理的地方提供空间明确的建议。最后，考虑到沉积物径流增加可以加强珊瑚礁的关键退化反馈循环，最大限度地减少沉积物径流可以在帮助珊瑚礁从气候相关干扰中恢复方面发挥重要作用。