生态学杂志2025，Vol.44Issue(1)：85-93,9.DOI:10.13292/j.1000-4890.202501.047
天津七里海湿地生长季土壤CO2通量及水热因子变化特征
Characteristics of soil CO2 flux and hydrothermal factors during the growing season in Qilihai wetland,Tianjin
摘要
Abstract
Soil respiration plays a critical role in the CO2 emissions of terrestrial ecosystems.It is of great signifi-cance to identify the dynamics of CO2 and its controlling factors for global change research.Nevertheless,continu-ous in-situ observations of soil respiration in wetlands are relatively rare.In this study,we utilized CO2 flux sensor and soil temperature and moisture sensors to continuously monitor soil respiration in the Qilihai wetland,located in Tianjin,the Bohai Rim.Our objective was to investigate the diurnal and seasonal variations of CO2 flux,hydrother-mal factors in wetland soil,and the response of CO2 flux to soil hydrothermal factors during the growing season(May 1 to September 30,2022).The results showed that soil CO2 flux exhibited a first increasing and then decrea-sing trend during the growing season,with a mean value of 6.68±2.55 μmol·m-2·s-1.Temperature was positively correlated with soil CO2 flux,which explained 75.7％of the variation in soil respiration during the study period.Moreover,wetland soil demonstrated a strong temperature sensitivity of soil respiration,with a Q10 value of 3.21.On a diurnal scale,CO2 flux displayed a unimodal variation,with a lag effect to soil temperature and a counterclock-wise characteristic overall.Additionally,soil respiration exhibited a weak negative correlation with soil water con-tent.With the limitations of initial soil moisture,CO2 flux reached a transient peak at the beginning of rainfall event,followed by a significant reduction in CO2 emissions during the rainfall,and then a rapid increase in CO2 flux at the end of the short-term rainfall.Overall,our results illustrated that soil temperature was the primary con-trolling factor for soil respiration during the growing season,and soil respiration was also influenced by soil water content during rainfall events.Thus,future warming and rainfall frequency associated with climate change could lead to significant changes in soil carbon fluxes in wetland ecosystems.关键词
湿地/土壤呼吸/土壤温度/Q10/滞后现象/降雨事件Key words
wetland/soil respiration/soil temperature/Q10/hysteresis/rainfall event引用本文复制引用
李世勇,丁虎,陈静,韩晓昆,薛浩,华海锋,郎赟超..天津七里海湿地生长季土壤CO2通量及水热因子变化特征[J].生态学杂志,2025,44(1):85-93,9.基金项目
国家科技基础资源调查专项项目(2021FY101001)、天津市科技局项目(21ZYJDJC00090)、国家自然科学基金项目(41971123)和天津市研究生科研创新项目(2021YJSS034)资助. （2021FY101001）
