講演詳細

立地部門[Forest Environment]

日付	2025年3月22日
開始時刻	9:30
会場名	N13
講演番号	I-3
発表題目	Assessing Nitrate Dynamics and Environmental Drivers in Mountain Streams of Kyushu Main Island Assessing Nitrate Dynamics and Environmental Drivers in Mountain Streams of Kyushu Main Island
所属	Kyoto University
要旨本文	Forested ecosystems play a crucial role in regulating nutrient dynamics and maintaining water quality within watersheds. On Kyushu Main Island, Japan, diverse geographical features and environmental factors, including precipitation, nitrogen deposition, and land-use practices, influence stream nitrate (NO₃⁻) concentrations. To investigate NO₃⁻ dynamics and environmental drivers in mountain stream NO₃⁻ concentrations, 869 water samples were collected under base flow conditions from undisturbed forested watersheds in Kyushu Main Island, including Miyazaki, Kagoshima, Kumamoto, Nagasaki, Saga, Fukuoka and Oita prefectures during 2016-2017. The mean of stream NO₃⁻ concentrations was 0.43 mg N L-1 (SD ± 0.44) and the concentrations varied from values below the detection limit (0.02 mg N L-1) to 4.19 mg N L-1. The key environmental factors influencing stream NO₃⁻ concentrations will be discussed by using random forest regression model.
著者氏名	○Nay Lin Maung ・ Naoko Tokuchi ・ Yukio Komai
著者所属	Kyoto University
キーワード	Stream Water Quality, Nitrate Concentration, Environmental Factors, Forested Watersheds, Random Forest Regression
Key word	Stream Water Quality, Nitrate Concentration, Environmental Factors, Forested Watersheds, Random Forest Regression