Santos Daniel M C, Estrada Gustavo C D, Fernandez Viviane, Estevam Marciel R M, Souza Brunna T DE, Soares Mário L G
Universidade do Estado do Rio de Janeiro, Faculdade de Oceanografia, Departamento de Oceanografia Biológica, Núcleo de Estudos em Manguezais, Rua São Francisco Xavier, 524, 4023-E, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil.
Faculdades São José, Escola de Saúde, Av. de Santa Cruz, 580, Realengo, 21710-232 Rio de Janeiro, RJ, Brazil.
An Acad Bras Cienc. 2017 Jul-Sep;89(3):1579-1589. doi: 10.1590/0001-3765201720160496. Epub 2017 Aug 14.
Studies on belowground roots biomass have increasingly reported the importance of the contribution of this compartment in carbon stock maintenance in mangrove forests. To date, there are no estimates of this contribution in Brazilian mangrove forests, although the country has the second largest area of mangroves worldwide. For this study, trenches dug in fringing forests in Guaratiba State Biological Reserve (Rio de Janeiro, Brazil) were used to evaluate the contribution of the different classes of roots and the vertical stratification of carbon stock. The total carbon stock average in belowground roots biomass in these forests was 104.41 ± 20.73 tC.ha-1. From that, an average of 84.13 ± 21.34 tC.ha-1 corresponded to the carbon stock only in fine roots, which have diameters smaller than 5 mm and are responsible for over 80% of the total belowground biomass. Most of the belowground carbon stock is concentrated in the first 40 cm below the surface (about 70%). The root:shoot ratio in this study is 1.14. These estimates demonstrate that the belowground roots biomass significantly contributes, more than 50%, to the carbon stock in mangrove forests. And the mangrove root biomass can be greater than that of other Brazilian ecosystems.
关于地下根系生物量的研究越来越多地报道了这一组成部分在红树林碳储量维持中的重要贡献。迄今为止，尽管巴西拥有世界第二大红树林面积，但该国红树林的这一贡献尚无估算。在本研究中，通过在瓜拉蒂巴州生物保护区（巴西里约热内卢）边缘森林挖掘沟渠，来评估不同根系类别的贡献以及碳储量的垂直分层。这些森林地下根系生物量中的总碳储量平均为104.41±20.73吨碳/公顷。其中，平均84.13±21.34吨碳/公顷仅对应于直径小于5毫米的细根中的碳储量，这些细根占地下生物总量的80%以上。大部分地下碳储量集中在地表以下40厘米深处（约70%）。本研究中的根冠比为1.14。这些估算表明，地下根系生物量对红树林碳储量的贡献显著超过50%。而且红树林根系生物量可能大于巴西其他生态系统。
