Position: Home > Articles > Effects of simulated rainfall enhancement on sediment CO_2 flux in dry lakebed of Barkol Lake, China
Chinese Journal of Applied Ecology
2022
(1)
210-218
模拟增雨对巴里坤湖干涸湖底沉积物CO_2通量的影响
作 者：
张语馨;蒋靖佰伦;李典鹏;姚美思;孙涛;周建勤;贾宏涛
单 位：
新疆农业大学草业与环境科学学院;哈密市伊州区统计局
关键词：
干旱区盐湖;降雨增加;碳通量;湖底沉积物
摘 要：
明确湖泊沉积物碳过程对气候变化的响应,是全面了解湖泊生态系统碳收支的重要环节。为探究未来降雨增加对沉积物碳通量的影响,本研究以新疆哈密巴里坤盐湖干涸湖底原状沉积物为对象,基于1960年以来新疆哈密地区降雨量增加速率(4 mm·10 a~(-1))以及植物生长季多年降雨量分布特征,以2016年生长季(5—10月)降雨量(86 mm)为对照(T_0),设置4个模拟增雨处理,降雨量分别为94 mm(T_1)、102 mm(T_2)、110 mm(T_3)、126 mm(T_4),分析模拟增雨对沉积物CO_2通量的影响。结果表明:与降雨前相比,各处理降雨1 d后的沉积物CO_2通量均呈增加趋势;与5—7月相比,8—10月各处理沉积物CO_2通量均有所下降。5—10月,T_0～T_3处理之间CO_2累积排放量无显著差异,T_3处理CO_2平均排放速率(0.22μmol·m~(-2)·s~(-1))显著高于T_4处理(0.14μmol·m~(-2)·s~(-1))。每月降雨第1天各处理均表现为CO_2汇,T_4处理(-0.13μmol·m~(-2)·s~(-1))"碳汇"功能最强;每月降雨1 d后各处理沉积物表现为CO_2源,T_3处理CO_2平均排放速率(0.34μmol·m~(-2)·s~(-1))显著高于其他处理;与5月相比,T_2～T_4处理CO_2排放通量显著高于8—10月。在温度相对稳定的条件下,沉积物CO_2通量与含水量、空气湿度显著相关。未来60年,降雨持续增加可能是促进干旱区盐湖沉积物CO_2排放和影响全球变暖的重要因素。
译 名：
Effects of simulated rainfall enhancement on sediment CO_2 flux in dry lakebed of Barkol Lake, China
作 者：
ZHANG Yu-xin;JIANG Jing-bai-lun;LI Dian-peng;YAO Mei-si;SUN Tao;ZHOU Jian-qin;JIA Hong-tao;College of Grassland and Environmental Science, Xinjiang Agricultural University;Bureau of Statistics of Yizhou District;
关键词：
saline lake in arid region;;rainfall enhancement;;carbon flux;;lakebed sediment
摘 要：
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, T_0; 94 mm, T_1; 102 mm, T_2; 110 mm, T_3; 126 mm, T_4) based on the rainfall in growing season of 2016(86 mm). We analyzed the effects of rainfall increase on sediment CO_2 flux. Results showed that compared with that before rainfall, the sediment CO_2 flux increased after 1 day of rainfall in the study area. Compared with that during May to July, the CO_2 flux of sediments in August to October decreased. There was no variation of CO_2 accumulative emission among the T_0-T_3 treatments from May to October. However, the average CO_2 emission rate under the T_3 treatment(0.22 μmol·m~(-2)·s~(-1)) was significantly higher than that under the T_4 treatment(0.14 μmol·m~(-2)·s~(-1)). All treatments showed CO_2 sink at the first day of rainfall(1 d), with T_4 treatment(-0.13 μmol·m~(-2)·s~(-1)) having the highest “carbon sink” capacity. After 1 day, the CO_2 sink converted to CO_2 source under the five rainfall treatments, with the CO_2 emission rate under T_3 treatment(0.34 μmol·m~(-2)·s~(-1)) being significantly higher than those under other treatments. Compared with May, the CO_2 emission fluxes of T_2-T_4 treatments were significantly higher than those at the time from August to October. Under the condition with relatively stable temperature, the CO_2 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 CO_2 emission from lake sediment in arid regions, and thus affecting global warming.
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模拟增雨对巴里坤湖干涸湖底沉积物CO2通量的影响 [张语馨, 蒋靖佰伦, 李典鹏, 姚美思, 孙涛, 周建勤, 贾宏涛] 应用生态学报 2022,33 (1) 210-218
