冬小麦田春灌前后CO2排放通量的日变化特征及对比分析

万 盛; 秦天玲; 宋新山; 于志磊; 何 萌

引用本文:	万盛,秦天玲,宋新山,等.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,2019,38(6):80-84.
	,et al.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,2019,38(6):80-84.

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冬小麦田春灌前后CO2排放通量的日变化特征及对比分析
万盛，秦天玲，宋新山，于志磊，何萌
1.东华大学环境科学与工程学院，上海 201620； 2.中国水利水电科学研究院，北京 100044

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-0.123~0.056 mg/(m2·s)之间；春灌后，冬小麦田CO2排放通量在-0.345~0.276 mg/(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。

关键词: 冬小麦； CO2排放通量；春灌；日变化

DOI：doi：10.13522/j.cnki.ggps.2016.0122

分类号:

基金项目:

Change in CO2 Efflux Before and After Spring Irrigation in Winter Wheat Field

WAN Sheng, QIN Tianling, SONG Xinshan, YU Zhilei, HE Meng

1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;2. Institute of Water Resource and Hydraulic Research, Beijing 100044, China

Abstract:

【Objective】 Heterotrophic respiration is modulated by soil moisture and this paper aims to elicit the response of CO2 emission to irrigation from a winter wheat field. 【Method】Static and transparent box methods were used to measure the CO2 concentration at different growing stages from a winter wheat, using the hand-hold CO2 instrument Testo 535. The CO2 efflux was calculated from the change in CO2 concentration, and we then compared its diurnal variation before and after the spring irrigation. 【Result】CO2 efflux varied from -0.123 mg/(m2·s) to 0.056 mg/(m2·s) before the irrigation and from -0.345 mg/(m2·s) to 0.276 mg/(m2·s) after the irrigation, indicating that irrigation boosted both soil respiration and CO2 consumption by photosynthesis. The diurnal variation of CO2 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 CO2 efflux from the winter wheat field.

Key words: winter wheat field; CO2 efflux; spring irrigation; diurnal variation