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| Soil CO2 Emissions as Affected by 20-Year Continuous Cropping in Mollisols |
| YOU Meng-yang, YUAN Ya-ru, LI Lu-jun, XU Yan-li , HAN Xiao-zeng |
1、Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081,
P.R.China
2、University of Chinese Academy of Sciences, Beijing 100049, P.R.China
3、College of Geographical Science, Harbin Normal University, Harbin 150025, P.R.China |
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摘要 Long-term continuous cropping of soybean (Glycine max), spring wheat (Triticum aesativum) and maize (Zea mays) is widely practiced by local farmers in northeast China. A field experiment (started in 1991) was used to investigate the differences in soil carbon dioxide (CO2) emissions under continuous cropping of the three major crops and to evaluate the relationships between CO2 fluxes and soil temperature and moisture for Mollisols in northeast China. Soil CO2 emissions were measured using a closed-chamber method during the growing season in 2011. No remarkable differences in soil organic carbon were found among the cropping systems (P>0.05). However, significant differences in CO2 emissions from soils were observed among the three cropping systems (P<0.05). Over the course of the entire growing season, cumulative soil CO2 emissions under different cropping systems were in the following order: continuous maize ((829±10) g CO2 m-2)>continuous wheat ((629±22) g CO2 m-2)>continuous soybean ((474±30) g CO2 m-2). Soil temperature explained 42-65% of the seasonal variations in soil CO2 flux, with a Q10 between 1.63 and 2.31; water-filled pore space explained 25-47% of the seasonal variations in soil CO2 flux. A multiple regression model including both soil temperature (T, °C) and water-filled pore space (W, %), log(f)=a+bT log(W), was established, accounting for 51-66% of the seasonal variations in soil CO2 flux. The results suggest that soil CO2 emissions and their Q10 values under a continuous cropping system largely depend on crop types in Mollisols of Northeast China.
Abstract Long-term continuous cropping of soybean (Glycine max), spring wheat (Triticum aesativum) and maize (Zea mays) is widely practiced by local farmers in northeast China. A field experiment (started in 1991) was used to investigate the differences in soil carbon dioxide (CO2) emissions under continuous cropping of the three major crops and to evaluate the relationships between CO2 fluxes and soil temperature and moisture for Mollisols in northeast China. Soil CO2 emissions were measured using a closed-chamber method during the growing season in 2011. No remarkable differences in soil organic carbon were found among the cropping systems (P>0.05). However, significant differences in CO2 emissions from soils were observed among the three cropping systems (P<0.05). Over the course of the entire growing season, cumulative soil CO2 emissions under different cropping systems were in the following order: continuous maize ((829±10) g CO2 m-2)>continuous wheat ((629±22) g CO2 m-2)>continuous soybean ((474±30) g CO2 m-2). Soil temperature explained 42-65% of the seasonal variations in soil CO2 flux, with a Q10 between 1.63 and 2.31; water-filled pore space explained 25-47% of the seasonal variations in soil CO2 flux. A multiple regression model including both soil temperature (T, °C) and water-filled pore space (W, %), log(f)=a+bT log(W), was established, accounting for 51-66% of the seasonal variations in soil CO2 flux. The results suggest that soil CO2 emissions and their Q10 values under a continuous cropping system largely depend on crop types in Mollisols of Northeast China.
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Received: 09 October 2013
Accepted:
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| Fund: This work was supported by the Key Research Program of the Chinese Academy of Sciences (KZZD-EW-TZ-16-02), the Foundation for Young Talents of the Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences (DLSYQ13001), and the National Natural Science Foundation of China (41101283). |
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Corresponding Authors:
HAN Xiao-zeng, Tel: +86-451-86602940, E-mail: xzhan@iga.ac.cn; LI Lu-jun, Tel: +86-451-86601048, Fax: +86-451-86603736, E-mail: lilujun@
iga.ac.cn
E-mail: xzhan@iga.ac.cn;lilujun@
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| About author: HAN Xiao-zeng, Tel: +86-451-86602940, E-mail: xzhan@iga.ac.cn |
Cite this article:
YOU Meng-yang, YUAN Ya-ru, LI Lu-jun, XU Yan-li , HAN Xiao-zeng.
2014.
Soil CO2 Emissions as Affected by 20-Year Continuous Cropping in Mollisols. Journal of Integrative Agriculture, 13(3): 615-623.
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