Nitrogen and carbon cycle in the long-term sewage sludge composts applied field : Analysis using ^<15>N and ^<13>C natural abundance techniques

GOTO Shigeko, YONEYAMA Tadakatsu

doi:10.20710/dojo.81.1_16

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Other Title

下水汚泥コンポスト長期連用圃場における下水汚泥コンポスト由来窒素および炭素の循環 : 安定同位体自然存在比を利用した解析
ゲスイオデイコンポストチョウキレンヨウホジョウニオケルゲスイオデイコンポストユライチッソオヨビタンソノジュンカンアンテイドウイタイシゼンソンザイヒオリヨウシタカイセキ

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Abstract

The dynamics of nitrogen and carbon in the field with continuous application of sewage sludge compost since 1978 were investigated using ^<15>N and ^<13>C natural abundance techniques. Barley (Hordeum vulgare L.) and corn (Zea mays L.) have been grown in an Andsol field in winter and summer, respectively, with composts or chemical fertilizers. Based on the analysis of natural abundances of nitrogen and carbon isotopes in crops and soils, following three were concluded. (1) A part of the sewage sludge compost applied to the field was quickly decomposed and mineralized during the early short period, and the other part was remained in the soil for a long time and slowly decomposed and mineralized. By application of the sewage sludge composts, the δ^<15>N values of the soil were increased while the δ^<13>C values were decreased. (2) The nitrogen mineralized from the sewage sludge compost was absorbed first to leaves and finally allocated to the ears. The carbon dioxide derived from the sewage sludge compost was significantly fixed into barley but not into corn by leaf photosynthesis of CO_2 near the soil surface. (3) The organic carbon from the sewage sludge left in soil was estimated to be 35-44% of soil organic carbon after continuous application of sewage sludge compost for 26 years.

Journal

Japanese Journal of Soil Science and Plant Nutrition

Japanese Journal of Soil Science and Plant Nutrition 81 (1), 16-22, 2010

Japanese Society of Soil Science and Plant Nutrition

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