| Effect of nitrogen fertilizer and straw returning on CO2 emission in winter wheat field in irrigated region of central Shaanxi province |
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| DOI：10.7606/j.issn.1000-7601.2013.01.22 |
| Key Words: CO2 emission winter wheat nitrogen fertilizer straw returning soil temperature |
| Author Name | Affiliation | | WANG Shaojie | College of Environment and Resources, Northwest A&F University, Yangling, Sha
anxi 712100, China | | GAO Pengcheng | College of Environment and Resources, Northwest A&F University, Yangling, Sha
anxi 712100, China | | LIN Wen | College of Environment and Resources, Northwest A&F University, Yangling, Sha
anxi 712100, China | | YANG Xianlong | College of Environment and Resources, Northwest A&F University, Yangling, Sha
anxi 712100, China | | LIANG Ting | College of Environment and Resources, Northwest A&F University, Yangling, Sha
anxi 712100, China | | TONG Yanan | College of Environment and Resources, Northwest A&F University, Yangling, Sha
anxi 712100, China |
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| Abstract: |
| The CO2 emission in winter wheat field in irriga
ted region of central Shaanxi province under different N rates and straw returni
ng(190 kg N·hm-2,N190; 150 kg N·hm-2,N150; 75 kg N·hm-2,N75
; 150 kg N·hm-2+5000 kg·hm-2 straw，N150+S) was measured by using
static chamber/gas chromatography methods, and the infl
uence factors of CO2 emission were analyzed. The results showed that the CO2
flux fluctuated with the seasonal temperature change. There were highly signifi
cant exponential relationships between CO2 flux and both soil and air temperat
ure. The correlation coefficient between CO2 flux and air temperature was high
er than that between CO2 flux and soil temperature in four treatments. The tot
al CO2 emission in the whole growing season could be ranked as: N150+S＞N150≈
N190＞N75. The CO2 emission increased with the rise of N application rate with
in low and moderate levels. Straw returning boosted CO2 emission greatly, whic
h was 18% higher than no straw. |
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