National Plateau Wetlands Research Center, College of Wetland, Southwest Forestry University, Kunming 650224, China.
Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai 264025, Shandong, China.
Ying Yong Sheng Tai Xue Bao. 2024 Feb;35(2):415-423. doi: 10.13287/j.1001-9332.202402.031.
Estuarine wetlands exhibit significant interaction between fresh and salt water, with long-term carbon sequestration capability. We set up 60 sampling sites in the reed wetlands of the fresh-salt water interaction zone of the Yellow River Estuary, covering four different zones of the weak-intensity fresh-salt water interaction zone (WIZ), medium-intensity fresh-salt water interaction zone (MIZ), high-intensity interaction fresh-salt water zone (HIZ) and strong-intensity fresh-salt water interaction zone (SIZ). We investigated how fresh-salt water interaction affected the spatial variation of soil organic carbon (SOC) storage. The results showed that the area of reed wetland accounted for 17.8% of the total area of the fresh-salt water interaction zone the Yellow River Estuary, which mainly distributed in the WIZ and MIZ. The SOC content of reed wetland in the fresh-salt water interaction zone ranged from 1.09 to 3.65 g·kg, the SOC density was between 1.85-5.84 kg·m, and the SOC storage was (17.32±3.64)×10 t. The SOC content and SOC density decreased with increasing fresh-salt water interaction. There were significant differences in surface SOC content between different subzones of the fresh-salt water interaction zone. The surface SOC content decreased significantly with the increases of fresh-salt water interaction intensity. SOC density was positively correlated with SOC, TN, NH-N, and biomass, but negatively correlated with salt ions, soil bulk density, pH, and EC. SOC storage in the 0-30 cm soil layer accounted for 50.9%-64.2% of that in the 0-60 cm soil layer, while SOC storage in the 0-60 cm soil layer occupied 19.1%-37.7% of that in the 0-400 cm soil layer. The results could provide a scientific basis for accurately evaluating SOC storage of estuarine wetlands, improving carbon sink function and wetland management.
黄河口滨海湿地受淡咸水交互作用影响，具有长期碳封存能力。本研究在黄河口滨海湿地盐淡水交互区设置 60 个样地，涵盖弱强度盐淡水交互区（WIZ）、中强度盐淡水交互区（MIZ）、高强度盐淡水交互区（HIZ）和强强度盐淡水交互区（SIZ）4 个不同区。调查了盐淡水交互作用对土壤有机碳（SOC）空间分布的影响。结果表明，黄河口盐淡水交互区的芦苇湿地面积占盐淡水交互区总面积的 17.8%，主要分布在 WIZ 和 MIZ。芦苇湿地 SOC 含量为 1.09-3.65 g·kg，SOC 密度为 1.85-5.84 kg·m，SOC 储量为（17.32±3.64）×10 t。SOC 含量和 SOC 密度随盐淡水交互作用的增强而降低。不同盐淡水交互区亚区的表层 SOC 含量存在显著差异。表层 SOC 含量随盐淡水交互强度的增加而显著降低。SOC 密度与 SOC、TN、NH-N 和生物量呈正相关，与盐离子、土壤容重、pH 和 EC 呈负相关。0-30 cm 土层 SOC 储量占 0-60 cm 土层 SOC 储量的 50.9%-64.2%，0-60 cm 土层 SOC 储量占 0-400 cm 土层 SOC 储量的 19.1%-37.7%。研究结果可为准确评价黄河口滨海湿地 SOC 储量、提高碳汇功能和湿地管理提供科学依据。
