The effect of clear-cutting using forestry machinery on dynamics of soil nitrogen and microbial community

2016 Fiscal Year Final Research Report

• Project/Area Number: 26292085
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Forest science
• Research Institution: Kyoto University
• Principal Investigator: TATENO RYUNOSUKE 京都大学, フィールド科学教育研究センター, 准教授 (60390712)
• Co-Investigator(Kenkyū-buntansha): 福澤 加里部 北海道大学, 学内共同利用施設等, 助教 (10456824) ; 鵜川 信 鹿児島大学, 農学部, 准教授 (30582738) ; 磯部 一夫 東京大学, 農学生命科学研究科, 助教 (30621833) ; 長谷川 尚史 京都大学, 学内共同利用施設等, 准教授 (70263134)
• Co-Investigator(Renkei-kenkyūsha): INAGAKI Yoshiyuki 独立行政法人森林総合研究所, 四国支所, 主任研究員 (00353590)
• Research Collaborator: IMADA Shogo ; IWAOKA Chikae ; NAKAYAMA Masataka ; UMEDA Hiroyuki
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 森林伐採 / 林業機械 / 窒素無機化 / 土壌微生物群集 / 窒素循環 / 圧密 / 室内培養 / 窒素動態

Outline of Final Research Achievements

Soil compaction by forestry machinery significantly affected on soil hardness and water content, however the effects of logging slash disposal and skid trails on soil hardness and water content were smaller than the effect of forestry machinery. The effects of soil compaction were mitigated within 10 years after clear-cutting.
According to laboratory incubation experiment used larch plantation forest soils at Hokkaido, net nitrification were not occurred in soils with strong compaction and irrigation treatments but occurred in control, suggesting denitrification could occurred probably due to low soil oxygen content by soil compaction and irrigation. However there were no clear effects of soil compaction on microbial community structure. According to laboratory incubation experiment used soils collected from broad area along Japanese archipelago, the response to soil compaction changed widely site by site.

Free Research Field

森林生態学