Carbon and nitrogen relationship in soil N Transformation of a forest ecosystem

土壤中碳氮关系 N 森林生态系统的转变

• 批准号: 08660188
• 负责人: TOKUCHI Naoko
• 金额: $ 1.6万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08660188/
• 关键词: forest ecosystem; forest soil; N cycling; N transformation; nilrification; energy source; 窒素無機化能; 可水溶性有機物; 腐植; 窒素無機化過程; 無機態窒素; 可水溶性炭素; 微生物

The objectives of this study are to describe the relationship between the form of inorganic N and C and to evaluate the importance of C as energy source for N cycling. We studied the transect along a slope under the same aged Cryptomeria plantation in Mt. Ryuoh, Shiga prefecture.1. Topographical variation of soil N transformation ; Although there was no significant difference in N mineralization rate, nitrification rate was different between the positions of the slope. Nitrification ratio to mineralization was almost 100% at the lower slope, while no nitrification occurred at the upper part of the slope. At the middle part of the slope, patchy distribution of high nitrification and low nitrification was shown.2. Controlling factor of net soil N transformation ; Soil moisture content, total C and N, water extractable organic C and N (ex. C and N) and pH were investigated along the transect. The principle analysis showed nitrification was the function of ex. C, ex. N and moisture content, while mineralization was the function of total C and N.it indicated that nitrification was controlled by available substrate, mineralization was regulated by total substrate.3. Controlling factor of gross soil N transformation ; Gross soil N transformation was investigated by using 15N dilution method. The high gross N mineralization and nitrification were shown at the lower part of the slope, It was consistent with the low soil C/N.At the upper part of the slope, low mineralization, low nitrification and high soil C/N was shown, It suggests that C is limiting under low C/N at the lower part of the slope and autotrophic nitrification dominated.

本研究的目的是描述无机氮和碳的形态之间的关系，并评价碳作为氮循环能源的重要性。对同龄柳杉人工林下的坡面样带进行了研究。滋贺县龙城1.土壤氮素转化的地形变化虽然氮素矿化速率没有显著差异，但不同坡位的硝化速率不同。坡面下部的硝化矿化比接近100%，而坡面上部没有发生硝化作用。坡面中部，高硝化和低硝化呈斑块状分布。土壤净氮素转化的控制因子：土壤水分、全碳、全氮、水浸提态有机碳、氮(例如，土壤水分含量、土壤全碳、全氮)。C和N)和pH沿样带调查。原理分析表明，硝化作用是EX的作用。C，例如。N和水分含量，而矿化作用是总C和N的函数，说明硝化作用受有效基质控制，矿化作用受总基质调控。土壤总氮转化的控制因素采用15N稀释法对土壤总氮转化进行了研究。坡面下部土壤总N矿化和硝化作用较高，与土壤C/N比值较低相一致；坡面上部表现为低矿化、低硝化和高C/N，说明坡面下部低C/N下C为限制状态，以自养硝化作用为主。

项目成果

Tokuchi,N.: "Gross N Transformation in a coniferous forest in Japan" Environmental Forest Science. 54. 239-244 (1998)

Tokuchi,N.：“日本针叶林的总氮转化”环境森林科学。

中西麻美: "森林表層土壌における無機能窒素の動態とカチオン濃度の対応" 京都大学農学部演習林報告. 69. 14-25 (1998)

中西麻美：“森林表层土壤中非功能性氮动态与阳离子浓度的对应关系”京都大学农学部实验森林报告书 69. 14-25 (1998)。

Hirobe, M.: "Spatial variability of soil N transformation pattern." Journal of European Soil Science. (in press).

Hirobe, M.：“土壤氮转化模式的空间变异性。”

中西麻美: "森林表層土壌における無機態窒素の動態とカチオン濃度の対応" 京都大学農学部演習林報告. 69. 14-25 (1998)

中西麻美：“森林表层土壤中无机氮动态与阳离子浓度的对应关系”京都大学农学部实验森林报告书 69. 14-25 (1998)。

徳地直子: "竜王山森林試験地の斜面上の異なる位置における窒素循環機構" 京都大学農学部演習林報告. 68. 9-25 (1996)

德地直子：“龙王山森林实验区斜坡上不同位置的氮循环机制”京都大学农学部实验森林报告68. 9-25（1996）。