Natural ^15N and ^13C Abundance in Andisols Influenced by Long-Term Fertilization Management in Japan
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概要
- 論文の詳細を見る
Two field experiments were conducted on Andisols in Japan to evaluate the changes in the natural ^15N and ^13C abundance in the soil profile and to determine whether the values of δ^15N could be used as an indicator of fertilizer sources or fertilizer fate. The 6-year experiment conducted at the National Agricultural Research Center (NARC) consisted of the following treatments: application of swine compost (COMPOST), slow-release nitrogen fertilizer (SRNF), readily available nitrogen fertilizer (RANF), and absence of fertilization (CONTROL). Experimental plots located at the Nippon Agricultural Research Institute (NARI) received cattle compost at different rates for 12 years; a forest soil at this site was sampled for comparison. Swine compost application led to a considerable change in the δ^15N distribution pattern in the soil profile, with the highest δ^15N values recorded in the top 20cm layers of the COMPOST plot, decreasing in the sequence of CONTROL ≥ RANF > SRNF, mainly due to the relatively high δ^15N value of swine compost and its subsequent decomposition. In contrast, SRNF application resulted in the lowest δ^15N values in soil, indicating the presence of negligible nitrogen losses relative to input and low nitrogen cycling rates. Values of δ^15N increased with compost application rates at NARI. In the leachate collected at 1-m depth, the δ^15N values decreased in the sequence of COMPOST > RANF ≥ CONTROL > SRNF. The δ^13C values in soil peaked in the 40-60 cm layers for all the fertilizers. The δ^13C value was lowest in forest soil due to the presence of plant residues in soil organic matter. These results indicated that the δ^15N values in the upper soil layers or leachate may enable to detect pollution sources of organic or inorganic nitrogen qualitatively in Andisols.
- 社団法人日本土壌肥料学会の論文
著者
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Ozaki Y
Water Quality Control Laboratory National Agricultural Research Center
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Zhao Bingzi
Water Quality Control Laboratory, National Agricultural Research Center
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Maeda Morihiro
Water Quality Control Laboratory, National Agricultural Research Center
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Ozaki Yasuo
Water Quality Control Laboratory, National Agricultural Research Center
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Ozaki Yasuo
Water Quality Control Laboratory Department Of Soils And Fertilizers National Agriculture Research C
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Maeda Morihiro
Water Quality Control Laboratory Department Of Soils And Fertilizers National Agriculture Research C
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Maeda M
Water Quality Control Laboratory National Agricultural Research Center
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Zhao Bingzi
Water Quality Control Laboratory National Agricultural Research Center
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Maeda Morihiko
Water Quality Control Laboratory, National Agricultural Research Center
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- Natural ^15N and ^13C Abundance in Andisols Influenced by Long-Term Fertilization Management in Japan
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