春季降雨分配变化对黄河三角洲滨海湿地土壤呼吸的影响

doi:10.13292/j.1000-4890.202107.007

生态学杂志 ›› 2021, Vol. 40 ›› Issue (7): 2094-2103.doi: 10.13292/j.1000-4890.202107.007

春季降雨分配变化对黄河三角洲滨海湿地土壤呼吸的影响

马澍^1,2,3,陶宝先¹,韩广轩^2,3,王晓杰^2,3,李培广^2,3,初小静^2,3*

（¹聊城大学环境与规划学院，山东聊城 252000； ²中国科学院烟台海岸带研究所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系统野外科学观测研究站，山东东营 257000）

出版日期:2021-07-10 发布日期:2021-07-13

Effects of spring rainfall distribution on soil respiration in a coastal wetland of the Yellow River Delta.

MA Shu^1,2,3, TAO Bao-xian¹, HAN Guang-xuan^2,3, WANG Xiao-jie^2,3, LI Pei-guang^2,3, CHU Xiao-jing^2,3*

(¹College of Environment and Planning, Liaocheng University, Liaocheng 252000, Shandong, China; ²Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, Shandong, China; ³Yellow River Delta Field Observation and Research Station of Coastal Wetland Ecosystem, Chinese Academy of Sciences, Dongying 257000, Shandong, China).

Online:2021-07-10 Published:2021-07-13

摘要/Abstract

摘要： 降雨季节分配通过影响土壤水盐运移，可能对滨海湿地碳循环产生影响。春季是滨海湿地植物对降雨分配最为敏感的阶段，但春季降雨分配变化对滨海湿地土壤呼吸的影响机制尚不明确。基于黄河三角洲滨海湿地春季降雨分配控制试验平台，设置+73%、+56%、对照、-56%和-73%五个处理（年总降雨量保持一致），探讨春季降雨分配对土壤呼吸的影响。结果表明：春土壤含水量随春季降雨分配增大而显著增大，秋季土壤含水量则随春季降雨分配增大而显著降低，土壤盐度季节动态变化趋势与土壤含水量相反，其中春季盐度相对其他季节波动最大；地下总生物量及深层地下生物量贡献率均随春季降雨分配增多而增大，而浅层地下生物量贡献率则相反；年均土壤呼吸速率随春季降雨分配减少而降低，其中+73%与-73%处理差异显著（P<0.05）；季节尺度上，春、夏季土壤呼吸速率表现为随春季降雨分配增加而升高的趋势，秋、冬季土壤呼吸速率则表现为随春季降雨分配增加而降低的趋势，但春季降雨分配增加对春夏季土壤呼吸的促进效应远大于对秋冬季的抑制效应；土壤呼吸年均值不仅与春季土壤含水量和土壤盐度呈显著相关，而且与地下不同层生物量贡献率及地下总生物量呈显著相关。

关键词: 降雨分配, 土壤呼吸, 水盐运移, 地下生物量, 滨海湿地

Abstract: Changes of rainfall seasonal pattern would affect carbon cycling in coastal wetlands by influencing the transport of water and salt in soils. Seed germination and plant growth in coastal wetlands are sensitive to rainfall availability in spring, but the underlying mechanism of spring rainfall distribution on soil respiration is still unclear. An insitu spring rainfall control field experiment with five treatments (+73%, +56%, control, -56% and -73% in spring, but the annual total rainfall remained the same) were set up to explore the effects of spring rainfall distribution on soil respiration of a coastal wetland on the Yellow River Delta. Soil water content in spring significantly increased with the increasing rainfall partitioning in spring, while that in autumn significantly decreased. The seasonal variation of soil salinity was opposite to soil moisture, and soil salinity showed strongest fluctuations in spring compared with other seasons. The total belowground biomass and the proportion of belowground biomass in deep soil layer increased with the increasing spring rainfall partitioning, while the proportion of belowground biomass in shallow soil layer showed an opposite pattern. Mean annual soil respiration rate was decreased with the decreasing spring rainfall partitioning, and was significantly different between +73% and -73% treatments (P<0.05). Soil respiration rate differed among different seasons. Soil respiration rate in spring and summer increased with the increasing rainfall partitioning in spring, but decreased in autumn and winter. However, the positive effect of increased spring rainfall partitioning on soil respiration in spring and summer was much greater than the negative effect in autumn and winter. Mean annual soil respiration was closely related to soil moisture and soil salinity in spring, and remarkably affected by the proportion of belowground biomass of different soil layers and total belowground biomass.

Key words: rainfall distribution, soil respiration, water and salt migration, belowground biomass, coastal wetland.

马澍, 陶宝先, 韩广轩, 王晓杰, 李培广, 初小静. 春季降雨分配变化对黄河三角洲滨海湿地土壤呼吸的影响[J]. 生态学杂志, 2021, 40(7): 2094-2103.

MA Shu, TAO Bao-xian, HAN Guang-xuan, WANG Xiao-jie, LI Pei-guang, CHU Xiao-jing. Effects of spring rainfall distribution on soil respiration in a coastal wetland of the Yellow River Delta.[J]. Chinese Journal of Ecology, 2021, 40(7): 2094-2103.

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春季降雨分配变化对黄河三角洲滨海湿地土壤呼吸的影响

Effects of spring rainfall distribution on soil respiration in a coastal wetland of the Yellow River Delta.

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