| 冬小麦田春灌前后CO2排放通量的日变化特征及对比分析 |
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| 引用本文： | 万盛,秦天玲,宋新山,于志磊,何萌.冬小麦田春灌前后CO2排放通量的日变化特征及对比分析[J].灌溉排水学报,2019(6):80-84. |
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| 作者姓名： | 万盛 秦天玲 宋新山 于志磊 何萌 |
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| 作者单位： | 1.东华大学环境科学与工程学院;2.中国水利水电科学研究院 |
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| 基金项目： | 国家自然科学基金项目(51409267) |
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| 摘 要： | 目的]分析冬小麦春灌前后CO2通量的变化特征,给农田生态系统的碳排放对大气中CO2通量的影响提供一定支撑。方法]采用静态透明箱法,通过手持式CO2测量仪(testo 535)观测分析了冬小麦田春灌前后每天不同时段内静态透明箱箱体内的CO2通量变化,通过不同时段内的CO2通量变化计算冬小麦田春灌前后每天不同时刻的CO2排放通量,分析比较了冬小麦田春灌前后CO2通量的日变化特征。结果]春灌前,冬小麦田CO2通量在-0.123~0.056mg/(m2 s)之间;春灌后,冬小麦田CO2排放通量在-0.345~0.276mg/(m2 s)之间。冬小麦田春灌后的CO2排放通量明显高于春灌前,其中光合作用吸收CO2和呼吸作用释放CO2同时增加,但吸收大气中CO2的速率增加的更大。冬小麦田在春灌前CO2排放通量的日变化特征为单峰型曲线,但在春灌后逐渐向双峰型曲线转变。结论]春灌影响冬小麦CO2排放通量的日变化。
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| 关 键 词： | 冬小麦 CO2排放通量 春灌 日变化 |
Change in CO_2 Efflux Before and After Spring Irrigation in Winter Wheat Field |
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| WAN Sheng,QIN Tianling,SONG Xinshan,YU Zhilei,HE Meng.Change in CO_2 Efflux Before and After Spring Irrigation in Winter Wheat Field[J].Journal of Irrigation and Drainage,2019(6):80-84. |
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| Authors: | WAN Sheng QIN Tianling SONG Xinshan YU Zhilei HE Meng |
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| Institution: | ,College of Environmental Science and Engineering, Donghua University,Institute of Water Resource and Hydraulic Research |
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| Abstract: | 【Objective】Heterotrophic respiration is modulated by soil moisture and this paper aims to elicit the response of CO_2 emission to irrigation from a winter wheat field.【Method】Static and transparent box methods were used to measure the CO_2 concentration at different growing stages from a winter wheat, using the hand-hold CO_2 instrument Testo 535. The CO_2 efflux was calculated from the change in CO_2 concentration, and we then compared its diurnal variation before and after the spring irrigation.【Result】CO_2 efflux varied from-0.123 mg/(m~2· s) to 0.056 mg/(m~2· s) before the irrigation and from-0.345 mg/(m~2· s) to 0.276 mg/(m~2· s) after the irrigation,indicating that irrigation boosted both soil respiration and CO_2 consumption by photosynthesis. The diurnal variation of CO_2 efflux had single peak before irrigation, but become bimodal after the irrigation.【Conclusion】The spring irrigation boosted soil respiration and led to a change in diurnal variation of CO_2 efflux from the winter wheat field. |
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| Keywords: | winter wheat field CO2 efflux spring irrigation diurnal variation |
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