Li Kang, Huang Huamei, Yan Ran, Zhang Shengpeng, Dong Di, Peng Bo
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Abstract
Mangrove plantation is a fundamental approach for the sustainable management of tropical and subtropical coasts to capture and store atmospheric carbon. However, it is unknown whether the carbon accumulation potential of planted mangroves is as much as that of natural mangroves. Moreover, the effects of tree species, forest age, and hydrodynamic conditions on carbon storage are still unclear. This study investigated the carbon storage potential and influencing factors for planted mangroves in Kaozhouyang, Huidong County, Guangdong Province. The Vegetation carbon stock was calculated by community parameters collected from field investigation, and ecosystem carbon stock was calculated by the sum of vegetation and sediment. The results showed that mangrove plantation significantly increased the carbon stock of the vegetation and soil (vegetation carbon stock = 9.9645.06 t C/ha; soil carbon stock = 70.37-110.64 t C/ha) compared with the nonvegetation mudflat (63.73 t C/ha). However, the ecosystem carbon stock of the planting sites was still lower than that of natural Avicennia marina (282.86 t C/ha), with the significant difference mainly reflected on the soil carbon stock (p < 0.05). Further results revealed that carbon accumulation was affected by forest age, tree species, and tidal level. The vegetation biomass/carbon stock gradually increased with forest age (p < 0.05), but the difference was not significant for soil carbon stock, which indicated that the carbon accumulation was mainly concentrated on the vegetation at the early stage of mangrove restoration. In addition, suitable habitat conditions (landward) and fast-growing species (Sonneratia apetala) are more beneficial to carbon accumulation. Our results suggest that mangrove plantations can achieve carbon storage and sequestration in vegetation and soil for increasing carbon sinks with suitable species selection and management.
红树林种植是热带和亚热带海岸可持续管理的基本途径，可以捕获和储存大气中的碳。然而，人工红树林的碳积累潜力是否与天然红树林一样多，目前尚不清楚。此外，树种、林龄和水动力条件对碳储量的影响尚不清楚。以广东省惠东县考洲阳人工林为研究对象，研究了人工林的碳储量潜力及其影响因素。植被碳储量由野外调查收集的群落参数计算，生态系统碳储量由植被与沉积物之和计算。结果表明：人工林显著增加了植被和土壤碳储量(植被碳储量= 9.9645.06 t C/ha；土壤碳储量为70.37 ~ 110.64 t C/ha)，而非植被泥滩的碳储量为63.73 t C/ha。但人工林生态系统碳储量仍低于天然海桐地（282.86 t C/ha），差异主要体现在土壤碳储量(p <；0.05)。结果表明，林龄、树种和潮位对碳积累有一定的影响。植被生物量/碳储量随林龄逐渐增加(p <；0.05)，但土壤碳储量差异不显著，说明红树林恢复初期碳积累主要集中在植被上。此外，适宜的生境条件（向陆）和速生物种（无瓣海桑）更有利于碳积累。研究结果表明，通过适当的树种选择和管理，红树林人工林可以在植被和土壤中实现碳的储存和封存，增加碳汇。
期刊介绍：
Frontiers in Marine Science publishes rigorously peer-reviewed research that advances our understanding of all aspects of the environment, biology, ecosystem functioning and human interactions with the oceans. Field Chief Editor Carlos M. Duarte at King Abdullah University of Science and Technology Thuwal is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, policy makers and the public worldwide.
With the human population predicted to reach 9 billion people by 2050, it is clear that traditional land resources will not suffice to meet the demand for food or energy, required to support high-quality livelihoods. As a result, the oceans are emerging as a source of untapped assets, with new innovative industries, such as aquaculture, marine biotechnology, marine energy and deep-sea mining growing rapidly under a new era characterized by rapid growth of a blue, ocean-based economy. The sustainability of the blue economy is closely dependent on our knowledge about how to mitigate the impacts of the multiple pressures on the ocean ecosystem associated with the increased scale and diversification of industry operations in the ocean and global human pressures on the environment. Therefore, Frontiers in Marine Science particularly welcomes the communication of research outcomes addressing ocean-based solutions for the emerging challenges, including improved forecasting and observational capacities, understanding biodiversity and ecosystem problems, locally and globally, effective management strategies to maintain ocean health, and an improved capacity to sustainably derive resources from the oceans.
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