外源物添加量和土壤性质对黄河三角洲滨海湿地土壤激发效应的影响

doi:10.13292/j.1000-4890.202508.013

生态学杂志 ›› 2025, Vol. 44 ›› Issue (8): 2497-2505.doi: 10.13292/j.1000-4890.202508.013

外源物添加量和土壤性质对黄河三角洲滨海湿地土壤激发效应的影响

胡聪月^1,2,3,张亚茹^1,2,3,韩村^2,3,李培广^2,3,韩广轩^2,3,宋维民^2,3*

（¹聊城大学地理与环境学院，山东聊城 252059； ²中国科学院烟台海岸带研究所，中国科学院海岸带环境过程与生态修复重点实验室，山东烟台 264003； ³中国科学院黄河三角洲滨海湿地生态实验站，山东东营 257500）

出版日期:2025-08-10 发布日期:2025-08-11

Impacts of exogenous organic carbon input and soil properties on priming effect in coastal wetlands of Yellow River Delta, China.

HU Congyue^1,2,3, ZHANG Yaru^1,2,3, HAN Cun^2,3, LI Peiguang^2,3, HAN Guangxuan^2,3, SONG Weimin^2,3*

(¹School of Geography and Environment, Liaocheng University, Liaocheng 252059, Shandong, China; ²CAS Key Laboratory of Coastal Environmental Processes and Ecological Restoration, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences (CAS), Yantai 264003, Shandong, China; ³Yellow River Delta Research Station of Coastal Wetland Ecology, Chinese Academy of Sciences, Dongying 257500, Shandong, China).

Online:2025-08-10 Published:2025-08-11

摘要/Abstract

摘要： 外源碳输入能通过加快或减缓土壤有机碳（SOC）矿化并产生正或负的激发效应来影响土壤碳库的储量和稳定性。然而，外源碳输入水平及土壤特征差异对土壤激发效应方向和强度的影响仍需明确。选择土壤理化性质具有差异性的两个滨海湿地（黄河现行河道（新河道）和1996年故道（旧河道））土壤作为研究对象，通过向土壤中添加¹³C标记的不同水平葡萄糖（0.2%、0.5%、2% SOC），研究外源有机碳输入水平对滨海湿地土壤激发效应的影响。研究发现：在0.2%和0.5%葡萄糖添加处理下两河道滨海湿地土壤产生正激发效应；2%葡萄糖添加处理却显著抑制了两河道滨海湿地土壤源CO₂排放并使激发效应转为负向。不同河道滨海湿地和葡萄糖添加量对滨海湿地土壤激发效应存在显著交互作用，在0.2%和0.5%葡萄糖添加处理下，两河道滨海湿地土壤的激发效应没有差异；但在2%葡萄糖添加处理下，旧河道滨海湿地土壤相较于新河道滨海湿地土壤产生更强的负激发效应。滨海湿地土壤激发效应与土壤微生物生物量碳呈显著负相关，这说明两河道滨海湿地土壤质地、养分和SOC含量等理化性质的差异影响了土壤微生物活性，进而调控了不同滨海湿地土壤激发效应对外源碳输入的响应。综上，滨海湿地土壤有机碳激发效应的方向和强度受到外源碳输入水平和土壤特性的双重调控，这会对滨海湿地生态系统碳循环过程产生重要影响，研究结果为进一步认识和评估滨海湿地土壤碳库的稳定性提供科学依据。

关键词: 土壤有机碳, 激发效应, 葡萄糖添加, 碳同位素, 滨海湿地

Abstract: Exogenous carbon input may either increase or decrease soil organic carbon (SOC) mineralization, resulting in a positive or negative priming effect, respectively, with consequence on soil carbon storage and stability. However, how differences in exogenous carbon input levels and soil properties affect the direction and intensity of the priming effect remains unknown. In this study, we collected soil samples from two coastal wetlands (new and old river channels) in the Yellow River Delta with different soil physicochemical properties, and conducted an incubation experiment to test the effects of different levels of isotope-labeled glucose addition (0.2%, 0.5% and 2% of SOC) on the priming effect of soil carbon mineralization. The results showed that the 0.2% and 0.5% treatments led to a positive priming effect, whereas the 2% treatment significantly inhibited native SOC mineralization and produced a negative priming effect. There was a significant interaction between wetland type and glucose addition level on the priming effect. There was no significant difference in the priming effect of the two wetlands under the 0.2% and 0.5% treatments. Soil from the old channel wetland produced a stronger negative priming effect than that in the new channel wetland under the 2% treatment. The priming effect was negatively correlated with microbial biomass carbon, suggesting that the differences in soil physicochemical properties, including soil texture, nutrient and organic carbon content, affected soil microbial biomass and activity, thus regulating the response of priming effect to exogenous carbon inputs. Overall, our results suggest that exogenous carbon addition levels and soil physicochemical properties co-regulate the direction and intensity of the priming effect in the coastal wetlands, with important consequence on soil carbon cycle of coastal wetlands. This study provides a scientific basis for understanding soil carbon stability in coastal wetlands.

Key words: soil organic carbon, priming effect, glucose addition, carbon isotope, coastal wetland

胡聪月, 张亚茹, 韩村, 李培广, 韩广轩, 宋维民. 外源物添加量和土壤性质对黄河三角洲滨海湿地土壤激发效应的影响[J]. 生态学杂志, 2025, 44(8): 2497-2505.

HU Congyue, ZHANG Yaru, HAN Cun, LI Peiguang, HAN Guangxuan, SONG Weimin. Impacts of exogenous organic carbon input and soil properties on priming effect in coastal wetlands of Yellow River Delta, China.[J]. Chinese Journal of Ecology, 2025, 44(8): 2497-2505.

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外源物添加量和土壤性质对黄河三角洲滨海湿地土壤激发效应的影响

Impacts of exogenous organic carbon input and soil properties on priming effect in coastal wetlands of Yellow River Delta, China.

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