Carbon resources of residue and manure in Japanese farmland soils |
| |
Authors: | Sonoko D Kimura Shin-Ichiro Mishima Kazuyuki Yagi |
| |
Affiliation: | (1) Graduate School of Agriculture, Department of International Environmental & Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu 183-8509, Japan;(2) Carbon and Nutrient Cycles Division, National Institute for Agro-Environmental Sciences, Tsukuba 305-8604, Japan |
| |
Abstract: | This study calculated the carbon (C) input to farmland soils in Japan in an effort to investigate the potential increase in
soil C of farmland soils by proper application of crop residues (straw and root) and manure. The calculation was based on
inventory and activity data obtained from statistics, literature sources and inquiry reports for the year 2005. The total
C resources from crop residues and manure in Japan were 6.1 Tg C year−1 and 2.3 Tg C year−1, of which 4.9 Tg C year−1 and 1.9 Tg C year−1, respectively, were applied to farmland soil. The average C application rate was 1.7 ± 1.6 Mg C ha farmland−1 year−1 and the proportion of manure was 23 ± 26%. One scenario that improved the allocation of manure and crop residue input to
farmland soil increased the average C input to farmland soil to 1.8 ± 1.3 Mg C ha farmland−1 year−1. This agricultural C flow represented only a small percentage of the global warming potential of the whole of Japan. Thus,
management of C resources in the agricultural sector should focus on the sustainable use of soil rather than the C sequestration
potential of soil. To improve the C flow for areas with high C input, the transportation of manure to neighboring municipalities
failed to reduce the excessive amount of manure since those areas are concentrated in only a few regions. Other measures were
required to reduce environmental problems due to the over-supply of manure to farmland soils. For areas with low C input,
the introduction of green manure, changes in cultivation methods, and land use type itself must be considered in relation
to the individual C requirements specific to land use, soil type and climate conditions. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|