机译:日本北海道山区与农业生产和环境负荷相关的氮循环评价
Faculty of Environment, Liaoning University, Shenyang 110036, China;
Faculty of Environment, Liaoning University, Shenyang 110036, China;
Faculty of Environment, Liaoning University, Shenyang 110036, China;
Cycling index; mountain agro-ecosystem; N cycling; N load; N management; Hokkaldo; Japan;