日本地球惑星科学連合2015年大会

講演情報

インターナショナルセッション(口頭発表)

セッション記号 A (大気水圏科学) » A-GE 地質環境・土壌環境

[A-GE04] Subsurface Mass Transport and Environmental Assessment

2015年5月24日(日) 11:00 〜 12:45 301A (3F)

コンビーナ:*森 也寸志(岡山大学大学院環境生命科学研究科)、斎藤 広隆(東京農工大学大学院農学研究院)、川本 健(埼玉大学大学院理工学研究科)、濱本 昌一郎(東京大学大学院農学生命科学研究科)、張 銘(産業技術総合研究所地圏資源環境研究部門)、座長:斎藤 広隆(東京農工大学大学院農学研究院)、濱本 昌一郎(東京大学大学院農学生命科学研究科)

12:15 〜 12:18

[AGE04-P01] The Effect of Artificial Macropores on the Amount of Organic Matters in Soils and Plant Biomass

ポスター講演3分口頭発表枠

*森 也寸志1山本 哲也2藤原 篤志2山岸 主門2松本 真悟2 (1.岡山大学、2.島根大学)

キーワード:マクロポア, 浸透, 炭素固定

Artificial macropores with fibrous material were installed in degraded red yellow soils to enhance vertical infiltration along with organic matter and nutrients. They enhanced vertical infiltration without cultivation which could cause small particle loss from the surface soils. Macropore and no macropore plots were prepared and total carbon in 10, 30, 50 cm depth were measured every half year. Infiltrated soil water was sampled through capillary force soil water sampler to measure total organic carbon and ion concentration. Results showed that soil total carbon in macropore plot increased in spring while it decreased in fall. Control plot showed few fluctuations. Total carbon concentration in soil water also showed higher trend in macropore plot, thus the TC fluctuation in soils could be caused by infiltrated soil water conducted by artificial macropores. Ion concentration was also measured to find that nitrate nitrogen was higher in summer season in macropore plot, which would be a source for biological decomposition of organic matter and also for nutrient for plant growth. Resulted plant biomass in macropore plot was two times larger than that in control plot. Additionally, plant species number observed at the macropore plot was 12, while it was 8 in control plot. This vegetation would be possible organic matter source for future soils. Finally, carbon increment in poor nutrient soils after macropore installation was calculated as 0.0036 g-C g-soil-1 yr-1 (20.4 t-C ha-1 yr-1), which was very successful. The study had successfully showed that relatively simple technique of artificial macropore with fibrous material could increase the organic matter in soils and recover the vegetation in ill-drained soils.