Simultaneous determination of transformation rates of nitrate in soil
ISSN | 00213551 |
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書誌レコードID(総合目録DB) | AA0068709X |
We determined the gross rates of nitrification and nitrate immobilization in soil using a 15N-nitrate isotope dilution technique. We also measured the amounts of nitrate immobilization and denitrification simultaneously by combining the acetylene inhibition technique and mass balance of nitrate. The immobilization rate of nitrate was enhanced by about 2 orders of magnitude by the addition of straw, while it did not increase significantly by the addition of manure. The denitrification rate in soil under anaerobic conditions was remarkably enhanced in the presence of straw, and enhancement of denitrification was also observed to some extent by the addition of manure or bark manure. In the soils treated with straw, the immobilization rate of nitrate under aerobic conditions was 24% of the denitrification rate under anaerobic conditions. Effect of water addition on nitrate immobilization and denitrification in soil was investigated in the presence or absence of straw. The amount of nitrate immobilization in the soils with straw did not change drastically with the moisture content, while that of denitrification changed by 2 or 3 orders of magnitude with the moisture content between 54-84% of the maximum water-holding capacity of soil irrespective of straw addition.
刊行年月日 | |
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作成者 | Takashi NISHIO Michio KOMADA Tomohito ARAO Tetsuo KANAMORI |
著者キーワード |
immobilization denitrification 15N isotope dilution |
公開者 | Japan International Research Center for Agricultural Sciences |
オンライン掲載日 | |
国立情報学研究所メタデータ主題語彙集(資源タイプ) | Journal Article |
巻 | 35 |
号 | 1 |
開始ページ | 11 |
終了ページ | 17 |
DOI | 10.6090/jarq.35.11 |
権利 | Japan International Research Center for Agricultural Sciences |
言語 | eng |