Askari Mahmood, Homaei Ahmad, Kamrani Ehsan, Zeinali Farrokhzad, Andreetta Anna
Department of Marine Biology, Faculty of Marine Science and Technology, University of Hormozgan, P.O. Box 3995, Bandarabbas, Iran.
Fisheries Department, Faculty of Marine Sciences and Technology, University of Hormozgan, Bandar Abbas, Iran.
Environ Sci Pollut Res Int. 2022 Apr;29(16):23712-23720. doi: 10.1007/s11356-021-17512-4. Epub 2021 Nov 23.
Despite the increasing interest in mangroves as one of the most carbon-rich ecosystems, arid mangroves are still poorly investigated. We aimed to improve the knowledge of biomass and soil carbon sequestration for an arid mangrove forest located at the Azini creek, Sirik, Hormozgan Province (Iran). We investigated the biomass and organic carbon stored in the above and belowground biomass for three different regions selected based on the composition of the principal species: (1) Avicennia marina, (2) mixed forest of A. marina and Rhizophora mucronata, and (3) R. mucronata. Topsoil organic carbon storage to 30 cm depth was also estimated for each analyzed area. Biomass carbon storage, considering both aboveground (AGB) and belowground biomass (BGB), was significantly different between the cover areas. Overall, the mean forest biomass (MFB) was 283.1 ± 89 Mg C ha with a mean C stored in the biomass of 128.9 ± 59 Mg C ha. Although pure Rhizophora stand showed the lowest value of above and below tree carbon (AGC + BGC); 17.6 ± 1.9 Mg C ha), soil organic carbon stock in sites under Rhizophora spp. was significantly higher than in the site with pure stand of Avicennia spp. Overall, forest soil stored the highest proportion of Sirik mangrove ecosystem organic carbon (59%), with a mean value of 188.3 ± 27 Mg C ha. These results will contribute to broaden the knowledge and the dataset available, reducing the uncertainties related to estimates and modeling of carbon pools in arid mangrove ecosystem, which also represent an important climatic threshold of mangrove worldwide distribution.
尽管红树林作为碳含量最高的生态系统之一越来越受到关注，但干旱地区的红树林仍未得到充分研究。我们旨在增进对位于伊朗霍尔木兹甘省锡里克阿齐尼溪的干旱红树林生物量和土壤碳固存的了解。我们基于主要物种的组成，对三个不同区域地上和地下生物量中储存的生物量和有机碳进行了调查：（1）白骨壤，（2）白骨壤和红树混交林，（3）红树。还对每个分析区域30厘米深度的表层土壤有机碳储量进行了估算。考虑地上生物量（AGB）和地下生物量（BGB）的生物量碳储量在覆盖区域之间存在显著差异。总体而言，平均森林生物量（MFB）为283.1±89 Mg C/ha，生物量中平均碳储量为128.9±59 Mg C/ha。尽管纯红树林地上和地下碳（AGC+BGC）的值最低（17.6±1.9 Mg C/ha），但红树属植物所在场地的土壤有机碳储量明显高于白骨壤纯林场地。总体而言，森林土壤储存了锡里克红树林生态系统有机碳的最大比例（59%），平均值为188.3±27 Mg C/ha。这些结果将有助于拓宽现有知识和数据集，减少与干旱红树林生态系统碳库估算和建模相关的不确定性，干旱红树林生态系统也是全球红树林分布的一个重要气候阈值。
