Denitrification characteristics of pond sediments in a Chinese agricultural watershed(<Special Section>Recent Progress of Agro-Environmental studies in the East Asian region)
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概要
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Ponds are widely distributed in rice-based agricultural watersheds, particularly in southern China, and may play an important role in nitrate (NO_3^-) removal. However, the denitrification rate of pond sediment, measured using the acetylene (C_2H_2) inhibition technique, indicated that the amount of nitrogen removed by denitrification accounted for <1% of the total nitrogen applied. The present study was undertaken to determine the effects of sediment depth and temperature on denitrification of pond sediment using the C_2H_2 inhibition technique. The highest denitrification potential was found in the upper 5cm of sediment, but this only accounted for approximately 34% of the total denitrification of the upper 0-30cm of sediment, suggesting that sediment denitrification potential would be underestimated if only the upper 5cm of sediment was measured. The denitrification potential was low and showed a weak response over a temperature range of 6-18℃, whereas denitrification increased significantly from 18 to 30℃, indicating that denitrification may play an important role in the removal of NO_3^- in warm seasons. A comparison of the NO_3^- disappearance and C_2H_2 inhibition methods showed that they were significantly (P<0.01) and positively correlated. However, the C_2H_2 inhibition method gave only approximately 25% of the values determined by the NO_3^- disappearance method.
- 社団法人日本土壌肥料学会の論文
著者
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Yan Xiaoyuan
Inst. Soil Sci. Chinese Acad. Sci. Nanjing Chn
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Yan Xiaoyuan
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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YANG Rong
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy
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TI Chaopu
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy
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LI Feiyue
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy
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LANG Man
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy
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KIMURA Sonoko
Department of International Environmental and Agricultural Science, Tokyo University of Agriculture
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Lang Man
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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Li Feiyue
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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Ti Chaopu
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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Yang Rong
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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Kimura Sonoko
Department Of International Environmental And Agricultural Science Tokyo University Of Agriculture A
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Yan Xiaoyuan
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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YAN Xiaoyuan
State Key Key Laboratory of Soil and Sustainable Agriculture, Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences
関連論文
- Airborne nitrogen load in Japanese and Chinese agroecosystems(Recent Progress of Agro-Environmental studies in the East Asian region)
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- Denitrification characteristics of pond sediments in a Chinese agricultural watershed(Recent Progress of Agro-Environmental studies in the East Asian region)
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