Faculty of Agriculture;
Yamagata University;
Wakabamachi 1-23;
Tsuruoka 997-8555;
Japan;
Research Institute for Humanity and Nature;
Motoyama 457-4;
Kamigamo;
Kita-ku;
Kyoto 603-8047;
Japan;
Department of Ocean and Environmental Sciences;
Tokyo University of Marine Science and Technology;
4-5-7 Konan Minato-ku;
Tokyo 108-8477;
Japan;
Amino acids; Cool temperate forest; Fresh litter; N resorption; δ15 N;