Kelp forests provide vital ecosystem services such as carbon storage and cycling, and understanding primary production dynamics regarding seasonal and spatial variations is essential. We conducted surveys at three sites in southeast Tasmania, Australia, that had different levels of water motion, across four seasons to determine seasonal primary production and carbon storage as living biomass for kelp beds of Lessonia corrugata (Order Laminariales). We quantified blade growth, erosion rates, and the variation in population density and estimated both the net biomass accumulation (NBA) per square meter and the carbon standing stock. We observed a significant difference in blade growth and erosion rates between seasons and sites. Spring had the highest growth rate (0.02 g C · blade⁻¹ · d⁻¹) and NBA (1.62 g C · m⁻² · d⁻¹), while summer had the highest blade erosion (0.01 g C · blade⁻¹ · d⁻¹), with a negative NBA (−1.18 g C · m⁻² · d⁻¹). Sites exhibiting lower blade erosion rates demonstrated notably greater NBA than sites with elevated erosion rates. The sites with the highest water motion had the slowest erosion rates. Moreover, the most wave-exposed site had the densest populations, resulting in the highest NBA and a greater standing stock. Our results reveal a strong seasonal and water motion influence on carbon dynamics in L. corrugata populations. This knowledge is important for understanding the dynamics of the carbon cycle in coastal regions.

中文翻译：

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海带Lessonia corrugata 的初级生产随季节和水流变化而变化：对沿海碳循环的影响

海带森林提供重要的生态系统服务，例如碳储存和循环，了解有关季节和空间变化的初级生产动态至关重要。我们在澳大利亚塔斯马尼亚东南部的三个地点进行了调查，这些地点在四个季节内具有不同水平的水运动，以确定海带藻（海带目）海带床的季节性初级生产和碳储存作为活生物量。我们量化了叶片生长、侵蚀率和人口密度的变化，并估计了每平方米的净生物量积累（NBA）和碳存量。我们观察到季节和地点之间叶片生长和侵蚀率存在显着差异。春季生长速率最高（0.02 g C·叶片⁻¹ ·d ⁻¹）和NBA（1.62 g C·m ⁻² ·d ⁻¹），而夏季叶片侵蚀最高（0.01 g C·叶片^{−1 ）} · d ^-1 )，具有负 NBA (-1.18 g C · m ^-2 · d ^-1 )。叶片侵蚀率较低的地点比侵蚀率较高的地点表现出明显更高的 NBA。水运动最高的地点侵蚀率最慢。此外，受海浪影响最大的地点人口最密集，导致 NBA 最高，存量也更大。我们的结果揭示了季节性和水流运动对L. corrugata种群碳动态的强烈影响。这些知识对于了解沿海地区碳循环的动态非常重要。