Effects of simulated rainfall enhancement on sediment CO2 flux in dry lakebed of Barkol Lake, China

doi:10.13287/j.1001-9332.202201.018

Abstract

Abstract: Understanding the responses of lake sediment carbon process to climate change is an important part of a comprehensive understanding of lake carbon budget. To explore the effects of future rainfall increase on sediment carbon flux, undisturbed sediment samples were collected from the bottom of dry lake Barikun in Hami, Xinjiang for the incubation experiment. Based on the increase rate of precipitation (4 mm·10 a^-1) and the distribution characteristics of rainfall in the plant growing season in Hami, Xinjiang since 1960, five rainfall treatments were set (86 mm, T₀; 94 mm, T₁; 102 mm, T₂; 110 mm, T₃; 126 mm, T₄) based on the rainfall in growing season of 2016 (86 mm). We analyzed the effects of rainfall increase on sediment CO₂ flux. Results showed that compared with that before rainfall, the sediment CO₂ flux increased after 1 day of rainfall in the study area. Compared with that during May to July, the CO₂ flux of sediments in August to October decreased. There was no variation of CO₂ accumulative emission among the T₀-T₃ treatments from May to October. However, the average CO₂ emission rate under the T₃ treatment (0.22 μmol·m^-2·s^-1) was significantly higher than that under the T₄ treatment (0.14 μmol·m^-2·s^-1). All treatments showed CO₂ sink at the first day of rainfall (1 d), with T₄ treatment (-0.13 μmol·m^-2·s^-1) having the highest “carbon sink” capacity. After 1 day, the CO₂ sink converted to CO₂ source under the five rainfall treatments, with the CO₂ emission rate under T₃ treatment (0.34 μmol·m^-2·s^-1) being significantly higher than those under other treatments. Compared with May, the CO₂ emission fluxes of T₂-T₄ treatments were significantly higher than those at the time from August to October. Under the condition with relatively stable temperature, the CO₂ flux of sediments was significantly correlated with the sediment moisture and air humidity. In the next 60 years, the continuous increase of future rainfall may be an important factor promoting CO₂ emission from lake sediment in arid regions, and thus affecting global warming.

Key words: saline lake in arid region, rainfall enhancement, carbon flux, lakebed sediment

ZHANG Yu-xin, JIANG Jing-bai-lun, LI Dian-peng, YAO Mei-si, SUN Tao, ZHOU Jian-qin, JIA Hong-tao. Effects of simulated rainfall enhancement on sediment CO₂ flux in dry lakebed of Barkol Lake, China[J]. Chinese Journal of Applied Ecology, 2022, 33(1): 210-218.

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Effects of simulated rainfall enhancement on sediment CO₂ flux in dry lakebed of Barkol Lake, China

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