Evaluation of CO₂ Emission to Changes of Soil Water Content, Soil Temperature and Mineral N with Different Soil Texture in Pepper Cultivation
2008
Kim, G.Y. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea), E-mail: [email protected] | Song, B.H. (Chungbuk National University, Cheongju, Republic of Korea) | Hong, S.Y. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Ko, B.G. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Roh, K.A. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Shim, K.M. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Zhang, Y.S. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea)
Several researchers have proposed models or equations to predict soil CO₂ flux from more readily available biotic and abiotic measurement. Tree commonly used abiotic variables were N mineral and soil temperature and soil water content. This study was conducted to determine CO₂ emission to mineral N, soil water content and soil temperature with clay loam and sandy loam in pepper cultivation in 2004~2005. CO₂ flux in the upland with different levels of soil water potential was measured at least once in two weeks during the cropping period in the pepper cultivation plots. Soil water potential in the clay loam and sandy loam soils was established at -30kPa and -50kPa by measuring the soil gravimetric water content with two replications. CO₂ emission rate from the differently managed plots was highly correlation coefficient to between the mineral N (R=0.830**, 0.876**) and soil temperature (r²=0.793**, 0.804**) in the clay loam and sandy loam, respectively. However, the relationships between CO₂ emission and soil water content were non-significant. CO₂ emission at sandy loam soils was lower to 21~37% than at clay loam soils for both soil water conditions without differences in yield. At difference levels of soil water conditions, CO₂ emission at -50kPa decreased to 37.5% in comparison with that at -30kPa. From the path analysis as to contribution factors of GHGs, it appeared that contribution rate was in the order of soil temperature (54.9%), mineral N (32.7%), and soil moisture content (12.4%).
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