Effects of simulated nitrogen deposition on growth and photosynthesis of Schima superba, Castanopsis chinensis and Cryptocarya concinna seedlings
模拟氮沉降对三种南亚热带树苗生长和光合作用的影响

To evaluate the responses of subtropical forest trees in China to elevated nitrogen (N) deposition, we sprayed dissolved NH_4NO_3 on seedlings of Schima superba, Castanopsis chinensis and Cryptocarya concinna twice every month. The simulated elevated N depositions were equivalent to 0 (A), 5 (B), 10 (C), 15 (D) and 30 (E) g N/(m~2·a) and began in January, 2003. The results indicated that stem base diameter, height and branch number of seedlings for these three species increased significantly with N loads, w...