Evaluation of the soil carbon budget under different upland cropping systems in central Hokkaido, Japan(Environment)
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概要
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To evaluate the carbon budget in soils under different cropping systems, the carbon dioxide (CO_2) flux from soils was measured in a total of 11 upland crop fields within a small watershed in central Hokkaido over the no snow cover months for 3 years. The CO_2 flux was measured using a closed chamber method at bare plots established in each field to estimate soil organic matter decomposition. Temporal variation in instantaneous soil CO_2 fluxes within the sites was mainly controlled by soil temperature and moisture. Annual mean CO_2 fluxes and cumulative CO_2 emissions had no significant relationship with soil temperature and moisture (P>0.2). However, there was a significant quadratic relationship between annual mean CO_2 flux or cumulative CO_2 emission and soil clay plus silt content (%) (R^2=0.72〜0.74, P<0.0003). According to this relationship, the optimum condition for soil CO_2 emission is at a clay plus silt content of 63%. The cumulative CO_2 emission during the no snow cover season within each year varied from 1,159 to 7,349kgCha^<-1> at the different sites. The amount of crop residue carbon retained in the soils following a cropping season was not enough to offset the CO_2 emission from soil organic matter decomposition at all sites. As a consequence, the calculation of the soil carbon budget (i.e. the difference between the carbon added as crop residues and compost and the carbon lost as CO_2 from organic matter decomposition) ranged from -7,349 to -785kgCha^<-1>, except for a wheat site where a positive value of 4,901kgCha^<-1> was observed because of a large input of organic carbon with compost. The negative values of the soil carbon budget indicate that these cropping systems were net sources of atmospheric CO_2.
- 社団法人日本土壌肥料学会の論文
著者
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Hatano Ryusuke
Graduate School of Agriculture, Hokkaido University
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KIMURA Sonoko
Graduate School of Agriculture, Tokyo University of Agriculture and Technology
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Hatano Ryusuke
Research Faculty Of Agriculture Hokkaido University
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TOMA Yo
Graduate School of Agriculture, Hokkaido University
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Toma Yoh
Field Science Center For Northern Biosphere Hokkaido University
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Toma Yo
Graduate School Of Agriculture Hokkaido Univ. Sapporo 060-8589 Jpn
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Kimura Sonoko
Graduate School Of Agriculture Department Of International Environmental And Agricultural Science To
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Kimura Sonoko
Tokyo Univ. Agriculture And Technol. Tokyo
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MU Zhijian
College of Resources and Environment, Southwest University
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Hatano Ryusuke
Graduate School Of Agriculture Hokkaido Univ.
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Toma Yo
Field Science Center For Northern Biosphere Hokkaido University
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