畑土壌の80℃16時間水抽出性有機態窒素の分解特性
書誌事項
- タイトル別名
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- Decomposition characteristics of hot-water-extractable soil organic nitrogen during aerobic soil incubation
- ハタケ ドジョウ ノ 80℃ 16ジカンスイ チュウシュツセイ ユウキタイ チッソ ノ ブンカイ トクセイ
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To investigate the decomposition of hot-water-extractable soil organic matter (HWESOM) during aerobic soil incubation, we measured contents of dissolved organic carbon (C) and nitrogen (N) over time. Samples of four soil types with one of two fertilizer treatments were incubated at 30 ℃ for 5 months. The quantity of organic N in the HWESOM corresponded to 47〜65% of the total N mineralized during incubation. During incubation, the organic N content of the HWESOM decreased by 43〜90% and the organic C content decreased by 17〜37% of the initial contents. Assuming that the decomposition involved first-order reactions, the decomposed organic N and C had similar half-lives of several weeks. They were characterized by a low C/N ratio (3.4〜6.0), similar to that of proteins. The hydrolyzable amino acid content of the HWESOM decreased, but the amino acid composition did not change. The molecular weight distribution of the HWESOM was determined by high-performance size-exclusion chromatography with chemiluminescent N detection and VIS 420 nm: the organic N in compounds of large molecular weight (>10000 Da) and absorbance at 420 nm due to humic-acid simultaneously-decreased during incubation. Therefore, the decomposed organic matter consisted of proteins and humic-acid-like moieties.
収録刊行物
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- 日本土壌肥料学雑誌
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日本土壌肥料学雑誌 86 (1), 8-16, 2015
一般社団法人 日本土壌肥料学会
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詳細情報 詳細情報について
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- CRID
- 1390001206558830336
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- NII論文ID
- 110010032639
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- NII書誌ID
- AN00195767
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- ISSN
- 24240583
- 00290610
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- NDL書誌ID
- 026103423
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可