Estimation of Soil CO₂ Efflux from an Apple Orchard
2009
Lee, J.M., Chung Ang University, Anseong, Republic of Korea | Kim, S.H., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Park, H.S., Chung Ang University, Anseong, Republic of Korea | Seo, H.H., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Yun, S.K., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea
This study was conducted to quantify the soil respiratory CO₂ emission (SR) in an apple orchard and to determine its relationship with key environmental factors such as air temperature, soil temperature and soil moisture content. Experiment was made over the period from 23 April 2007 to 31 March 2008 in 'Fuji' apple orchard of National Institute of Horticultural and Herbal Science in Suwon, Gyeonggi-do, Korea. The SR was measured by using the automatic opening/closing chamber system based on a closed method. Diurnal variations in SR showed an increase around 0700 hours with increasing soil temperature, its peak between 1400 and 1500 hours, and then a gradual decrease thereafter. Daily variations in SR depended largely on soil and air temperatures over the year, ranging from 0.8 to 13.7 g CO₂ m-² d-¹. During the rainy spell in summer (July~Autumn) with higher temperature and more precipitation, the SR was lower than that in the spring (May~June) with moderate temperature. The SR showed a significant exponential relationship with soil temperature (r²=0.800) and air temperature (r²=0.805), but not with soil moisture content (r²=0.160). The Q∧10 values of SR with annual soil temperature and air temperature were 2.0 and 1.9, respectively. The annually integrated SR was 19.6 ton CO₂ ha-¹.
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