Direct relationship between stream nitrate concentration and nitrogen leaching in forest areas in th

• 作 者: HideshigeToda;YukoNoritake;TakashiKunito;
• 机 构: Faculty of Science,Shinshu University,Matsumoto,Nagano 3908621,Japan
• 出 处: International Symposium on Forest Soils(2013年森林土壤国际研讨会)
• 发表日期: 2013年期

　　Nitrogen leaching rates,potential N mineralization rates,and C and N contents in leaf litters and surface soils were analyzed in 8 forest watersheds(west of Tokyo)with different nitrate concentration in their streams.Nitrate concentration in the stream waters ranged from 0.1 to 1.4 mg N/L.There is a significant positive relationship between nitrogen leaching rates measured by using ion exchange resin bags buried at 40cm depth and stream nitrate concentrations.The potential N mineralization rates significantly negatively correlated with C/N ratio in surface soils,and positively correlated with N leaching rates.Active nitrogen mineralization might cause larger nitrogen leaching,resulting in higher nitrate concentration in stream waters in some forest areas in Japan.