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。
Effects of fresh-salt water interaction on spatial variations of soil organic carbon in reed wetland of Yellow River Estuary
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.
Yellow River Estuaryfresh-salt water interactionreed wetlandsoil organic carbon storagespatial differentiation
万方数据
维普
