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高二酸化炭素濃度条件が水田土壌中の可溶態炭素とメタン放出に及ぼす影響

高二氧化碳浓度条件对水稻土可溶性碳和甲烷排放的影响

基本信息

批准号：
04F04429
负责人：
犬伏和之
金额：
$ 1.54万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04F04429/
关键词：
メタン水田生成活性温度条件水稲根圏メタン生成菌分泌炭素

项目摘要

化石燃料の大量使用と森林の減少によって、大気中の二酸化炭素濃度が上昇し地球温暖化を引き起こしつつあることは、すでに広く知られているが、増加する大気二酸化炭素濃度が農業生態系に及ぼす影響はまだ完全には理解されていない。人類の約1/3以上の食糧生産の場である水田における大気二酸化炭素濃度上昇の影響は、1998年から農業環境技術研究所を中心として世界で初めて岩手県の開放系水田で試験されてきた。昨年度は岩手県の試験水田で落水後に採取された表層土壌と次表層土壌を2段階の温度条件(25℃と30℃)で40日間密閉培養し、その間の生成メタン量、二酸化炭素量、可溶態炭素量を測定した。本年度の分析結果から、高二酸化炭素条件下の水田土壌は対照区土壌に比べてメタン生成活性が次表層で高く、表層で低いことが見出された。また可溶態炭素量はいずれの土層でも高二酸化炭素条件下のほうが対照区より多いことが見出された。また本年度は農業環境技術研究所と共同で、大気二酸化炭素濃度上昇が水稲からのメタン放出量と分泌炭素量に及ぼす影響についてインディカを含む4種の水稲品種を用いて測定し、さらにメタン生成活性や土壌中の溶存メタン、可溶態炭素量との関係を明らかにした。その結果、メタン放出量は開花期に最高を記録したが、その時期は品種により移植後56〜70日と異なった。生育期間の全メタン放出量は高二酸化炭素条件下のほうが対照区より多いことが見出され、品種別にはIR72>Dular>NPT(IR67966)>JP(コシヒカリ)の順になった。溶存メタン量も同様な傾向が認められたがその差は小さかった。現在、溶存炭素、メタン生成活性の結果を取りまとめ中である。

The fossil fuel plant uses a lot of carbon in the forest, the temperature of the earth warms up in the middle of the forest, the temperature of the earth, the temperature of the earth, In 1998, the center of the Institute of Agricultural Environmental Technology, the center of the Institute of Agricultural Environmental Technology had a significant impact on the temperature of carbon diacidizing in paddy fields, and in 1998, the center of the Institute of Agricultural Environmental Technology had a significant impact on the development of paddy fields. After the paddy field fell into the water last year, the temperature conditions (25 ℃-30 ℃) were measured for 40 days, and the amount of carbon diacidized and soluble carbon was determined. The results of this year's analysis showed that under the condition of high dicarboxylic acid, the activity of soil in the irradiated area of paddy field was higher than that of soil under the condition of high dicarboxylic acid. The amount of soluble carbon, the amount of carbon, the amount of soluble carbon, the amount of soluble carbon, the amount of carbon, This year, the amount of carbon released by the Institute of Agricultural Environmental Technology and the amount of carbon released from the agricultural environmental technology research institute of agricultural environmental technology and the amount of carbon released by the agricultural environmental technology research institute and the Institute of Agricultural Environmental Technology in this year's agricultural environmental technology research institute and the Institute of Agricultural Environmental Technology in this year's agricultural environmental technology research institute and the Institute of Agricultural Environmental Technology this year, the amount of carbon released from the agricultural environmental technology research institute, the amount of carbon released from the water supply and the amount of carbon released from the water supply, the amount of dissolved carbon and the amount of soluble carbon in the activated soil were determined by the determination of the amount of carbon released by the Institute of Agricultural Environmental Technology and the amount of dissolved carbon in the activated soil. The results of the test, the highest release in the flowering period and 56-70 days after the transplantation of the varieties in the normal period. Under the condition of high dicarboxylic acid carbon during the growth period, under the condition of high dicarboxylic acid, IR72>Dular>NPT (IR67966) & gt;JP (maleic acid). The amount of water in the solution is the same as that in the same way. At present, the carbon is dissolved, and the production activity of carbon is extracted from the results.