Effects of fresh-salt water interaction on spatial variations of soil organic carbon in reed wetland of Yellow River Estuary
于淼 1郭雪莲 1栗云召 2张昆 1杜朝红2
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作者信息
1. 西南林业大学湿地学院,国家高原湿地研究中心,昆明 650224
2. 鲁东大学滨海生态高等研究院,山东烟台 264025
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摘要
河口湿地具有显著的咸淡水交互特征和长期持续的固碳能力.本研究以黄河口咸淡水交互区芦苇湿地作为研究对象,在弱强度交互区、中等强度交互区、较高强度交互区和高强度交互区布设60个研究点位,分析咸淡水交互作用对土壤有机碳空间分异的影响.结果表明:黄河口咸淡水交互区芦苇湿地面积占比为17.8％,主要分布在弱强度交互区和中等强度交互区.咸淡水交互区芦苇湿地0～60cm 土层有机碳含量在1.09～3.65 g·kg-1,有机碳密度在1.85～5.84 kg·m-2,有机碳总储量为(17.32±3.64)x 104 t,有机碳含量与密度均随着咸淡水交互作用的增强而降低.咸淡水交互区分区间表层土壤有机碳含量差异显著,随着咸淡水交互强度的增大,表层土壤有机碳含量明显减低.有机碳密度与土壤有机碳、总氮、铵态氮及生物量呈显著正相关,而与盐离子、土壤容重、pH及电导率呈显著负相关.0～30 cm 土层有机碳储量占0～60 cm土层有机碳储量的50.9％～64.2％,0～60 cm 土层有机碳储量占0～400 cm 土层有机碳总储量的19.1％～37.7％.研究结果可为准确评估河口湿地碳储量、提升碳汇功能及湿地管理提供科学依据.
Abstract
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-1,the SOC density was between 1.85-5.84 kg·m-2,and the SOC storage was(17.32±3.64)×104 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 interac-tion zone.The surface SOC content decreased significantly with the increases of fresh-salt water interaction intensity.SOC density was positively correlated with SOC,TN,NH4+-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.
关键词
黄河口/咸淡水交互作用/芦苇湿地/有机碳储量/空间分异
Key words
Yellow River Estuary/fresh-salt water interaction/reed wetland/soil organic carbon storage/spatial differentiation
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万方数据