Predicting chronosequential changes in carbon stocks of pachymorph bamboo communities in slash-and-burn agricultural fallow,northern Lao People’s Democratic Republic |
| |
| Authors: | Yoshiyuki Kiyono Yukihito Ochiai Yukihiro Chiba Hidetoshi Asai Kazuki Saito Tatsuhiko Shiraiwa Takeshi Horie Visone Songnoukhai Viengmany Navongxai Yoshio Inoue |
| |
| Institution: | (1) Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba 305-8687, Japan;(2) Japan International Cooperation Agency, Tokyo, Japan;(3) The Graduate School of Agriculture, Kyoto University, Kyoto, Japan;(4) Africa Rice Center (WARDA), Cotonou, Benin;(5) National Agriculture and Food Research Organization, Ibaraki, Japan;(6) Northern Agriculture and Forestry Research Center, National Agriculture and Forestry Research Institute, Luang Prabang, Lao People’s Democratic Republic;(7) National Institute for Agro-Environmental Sciences, Ibaraki, Japan |
| |
| Abstract: | In northern Lao People’s Democratic Republic, rising human population has drastically reduced the fallow period of slash-and-burn
agriculture which has led to a considerable decrease in the carbon stock in these communities. We estimated chronosequential
changes in the communities' carbon stocks, and established the relationship between the fallow period and fallow-period-average
carbon stocks in three carbon pools of bamboo-dominated communities in hilly areas of the Luang Prabang Province, northern
Lao People’s Democratic Republic. Based on measurements by destructive sampling, we devised a model and root-to-shoot ratios
for estimating bamboo biomass. In six secondary plant communities established after slash-and-burn cropping, we estimated
community biomass using the above model and others, and measured deadwood and litter stocks. The communities’ biomass and
deadwood significantly increased with time after the last cropping and the former reached about 100 Mg ha−1 after 15 years, whereas litter stocks did not show significant trends over time. Extending the fallow period from 2 to 5 years
would increase fallow-period-average carbon stock from 14.2 to 25.1 Mg C ha−1. The overstory height was significantly correlated with biomass, deadwood, and litter carbon stocks of these communities.
Based on our findings, changes in a community’s carbon stocks can be estimated using the changes in overstory height, which
should be taken into account in future studies to reduce uncertainty in estimating carbon stocks in tropical ecosystems. |
| |
| Keywords: | Belowground biomass Deadwood Litter Overstory height Root-to-shoot ratio |
| 本文献已被 SpringerLink 等数据库收录！ |
|
