Y. Usami

Annual net primary production and efficiency of solar energy utilization in three double-cropping agro-ecosystems in Japan

H. Koizumi, Y. Usami, M. Satoh, 1990 .

Examination of the method for measuring soil respiration in cultivated land: Effect of carbon dioxide concentration on soil respiration

H. Koizumi, T. Oikawa, Y. Usami, 1993, Ecological Research.

Carbon dynamics and budgets in three upland double-cropping agro-ecosystems in Japan

H. Koizumi, Y. Usami, M. Satoh, 1993 .

Effect of carbon dioxide concentration on microbial respiration in soil

H. Koizumi, T. Oikawa, M. Shiyomi, 1991, Ecological Research.