Nitrogen-fixing activity in decomposing litter of three tree species at a watershed in eastern Japan |
| |
Authors: | Takashi Yamanaka Keizo Hirai Shuhei Aizawa Shuichiro Yoshinaga Masamichi Takahashi |
| |
Institution: | (1) Forestry and Forest Products Research Institute, Tsukuba Ibaraki, 305-8687, Japan;(2) Tohoku Research Center, Forestry and Forest Products Research Institute, Morioka Iwate, 020-0123, Japan;(3) Hokkaido Research Center, Forestry and Forest Products Research Institute, Sapporo Hokkaido, 062-8516, Japan;(4) Kyushu Research Center, Forestry and Forest Products Research Institute, Kumamoto Kumamoto, 860-0862, Japan |
| |
Abstract: | Nitrogen fixation during litter decomposition was studied for 34 months using litterbags containing newly fallen litter of
coniferous species Cryptomeria japonica and Pinus densiflora and that of deciduous species Quercus serrata. Litterbags were set in contact with the forest floor in a deciduous broad-leaved forest near the top of a slope and in a
C. japonica stand at the middle of the slope at a watershed in eastern Japan. Nitrogen-fixing activity, estimated by acetylene reduction
after 16 and 19 months of incubation, was 62.65–3.86 nmoles C2H4 h−1 g−1 DW in Cryptomeria litter, but only 1.07–0.09 in Pinus and 0.72–0.04 in Quercus. The rate of N increase in decomposing litter was highest in Cryptomeria. Fungal biomass in decomposing litter, estimated by ergosterol content, increased during the initial 16 months of incubation
in Cryptomeria and Quercus, and during the initial 19 months of incubation in Pinus. The litter decomposition rate was highest in Cryptomeria among the three species, due to increased N content and fungal biomass in Cryptomeria litter. Thus, N increase in decomposing Cryptomeria litter affects the subsequent N dynamics and decomposition pattern. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|