Carbonate budgets are increasingly being used as a key metric to establish reef condition. To better understand spatial variations in framework and sediment net carbonate budgets, we quantified biogenic carbonate production, erosion, and dissolution within and between five distinct geomorphological habitats of Heron Reef on the southern Great Barrier Reef. The protected reef slope had the greatest estimated net framework carbonate budget (22.6 kgCaCO₃ m⁻² yr⁻¹ ± 2.4 SE), driven by abundant, fast‐growing acroporid corals coupled with low levels of macro‐ and micro‐bioerosion. The estimate of the exposed reef slope was significantly lower due to localized damage from a single tropical cyclone that occurred 7 years prior to this study (9.7 kgCaCO₃ m⁻² yr⁻¹ ± 2.8 SE). Within the extensive lagoon, net framework carbonate budgets ranged from 0.24 kgCaCO₃ m⁻² yr⁻¹ (± 0.1 SE) to 3.0 kgCaCO₃ m⁻² yr⁻¹ (± 0.7 SE). The greatest net sediment carbonate budget was estimated within the reef crest (6.0 kgCaCO₃ m⁻² yr⁻¹ ± 1.1 SE) and the lowest in the shallow lagoon (1.2 kgCaCO₃ m⁻² yr⁻¹ ± 0.2 SE). Chemical dissolution of the sediments exhibited spatial variability, with reef crest and reef flat sediments in a state of net production. Considering the area of each habitat, the net reef framework and sediment budgets across Heron Reef were 4.06 kgCaCO₃ m⁻² yr⁻¹ and 2.82 kgCaCO₃ m⁻² yr⁻¹, respectively. The results of this study improve our understanding of spatial variability in carbonate production and bioerosion and provide a comprehensive reef‐scale carbonate budget for a relatively undisturbed coral reef ecosystem.

中文翻译：

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生境特定的生物生产和侵蚀影响净框架和沉积物珊瑚礁碳酸盐预算

碳酸盐预算越来越多地被用作建立珊瑚礁状况的关键指标。为了更好地了解框架结构和沉积物净碳酸盐预算的空间变化，我们对南部大堡礁上五个不同地貌生境内和之间的生物碳酸盐生产，侵蚀和溶解进行了定量。受保护的珊瑚礁斜坡具有最大的估计净碳酸盐碳酸盐预算（22.6 kgCaCO ₃ m ^-2 yr ^-1  ±2.4 SE），这是由数量众多，生长迅速的顶孢类珊瑚以及低水平的宏观和微观生物侵蚀所驱动的。由于在此研究之前的7年中发生了一次热带气旋造成的局部破坏，因此对礁石裸露坡度的估算值明显较低（9.7 kgCaCO ₃m ^-2 yr ^-1  ±2.8 SE）。在广阔的泻湖中，框架碳酸盐的净预算范围从0.24 kgCaCO ₃ m ^-2 yr ^-1（±0.1 SE）到3.0 kgCaCO ₃ m ^-2 yr ^-1（±0.7 SE）。珊瑚礁顶上的最大净沉积碳酸盐预算估计为（6.0 kgCaCO ₃ m ^-2 yr ^-1  ±1.1 SE），最低的是浅泻湖（1.2 kgCaCO ₃ m ^-2 yr ^-1） ±0.2 SE）。沉积物的化学溶解表现出空间可变性，礁顶和礁滩沉积物处于净生产状态。考虑到每个栖息地的面积，整个苍鹭礁的净礁构架和沉积物预算分别为4.06 kgCaCO ₃ m ^-2 yr ^-1和2.82 kgCaCO ₃ m ^-2 yr ^-1。这项研究的结果增进了我们对碳酸盐生产和生物侵蚀的空间变异性的理解，并为相对不受干扰的珊瑚礁生态系统提供了礁石规模的碳酸盐预算。