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| DOI：doi：10.13522/j.cnki.ggps.2016.0122 |
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| Change in CO2 Efflux Before and After Spring Irrigation in Winter Wheat Field |
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WAN Sheng, QIN Tianling, SONG Xinshan, YU Zhilei, HE Meng
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1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;2. Institute of Water Resource and Hydraulic Research, Beijing 100044, China
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| 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 |
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