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| Effects of Warming and Simulated Acid Rain on Soil Respiration in a Winter Wheat-Soybean Rotation Field |
| Received:July 02, 2014 |
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| KeyWord:warming;simulated acid rain;cropland;soil respiration |
| Author Name | Affiliation | E-mail | | ZHAI Xiao-yan | School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | CHEN Shu-tao | School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China | chenstyf@alinyun.com | | LIU Yi-fan | School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | ZHANG Xu | School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China | |
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| Abstract: |
| Soil respiration is an important process of global C cycling. Warming and acid rain may have impacts on soil respiration. The present study investigated the effects of warming and simulated acid rain on soil respiration in a winter wheat-soybean rotation field. There were control(CK), warming(W), acid rain(A), and warming plus acid rain(WA) combination treatments with three replicates. A randomized block experimental design was used. Soil respiration rates were measured using a portable soil CO2 fluxes system(LI-8100). Soil temperature and moisture were also simultaneously measured at the time of measuring soil respiration rates. Soil respiration had obvious seasonal patterns during winter wheat-soybean growing period. Seasonal mean of soil respiration rates for CK, W, A, and WA was (2.69±0.14) μmol·m-2·s-1, (3.19±0.20)μmol·m-2·s-1, (2.59±0.07)μmol·m-2·s-1, and(2.99±0.18)μmol·m-2·s-1, respectively. Soil respiration rates were no significant(P>0.05) differences among treatments during the winter wheat growing season, but significantly(P<0.05) higher in W treatment than in A treatment during soybean growing season. Also, highly significant(P<0.01) difference in soil respiration was found between A and WA treatments. During the whole winter wheat-soybean growing season soil respiration rates were higher in W treatment(P=0.054) than in CK, whereas soil respiration means were highly significantly lower in A treatments than in W treatment(P<0.01). For each treatment, soil respiration was significantly exponentially related(P<0.001) with soil temperature. A model including soil temperature and moisture performed better in modeling soil respiration than exponential model did for the A treatment. |
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