Nutrient cycle in shifting cultivation: Changes of carbon, nitrogen and potassium in the first year of shifting cultivation
2001
Furutani, R. (Ehime Univ., Matsuyama (Japan). Coll. of Agriculture) | Yoneda, R. | Ninomiya, I.
In order to examine the possibility of sustainable management of shifting cultivation from the viewpoint of nutrient cycling, experimental plot of shifting cultivation was established in school forest of Ehime university. We have collected plant and soil samples from the shifting cultivation plot (SC plot) and control plot before firing, immidiately after firing, one month after firing and at the time of crop harvesting. Carbon, nitrogen and potassium were analyzed for each sample. From the result, the accumulation of each element increased in both plots after firing. The amount of newly accumulated carbon in the control plot was bigger than that of SC plot. But opposite tendency was shown on nitrogen and potassium. High accumulation was shown in deeper horizon in control plot, while it was shown in the upper horizon in SC plot. Since the accumulation of elements in the soil was bigger than the absorption by the plant, it was concluded that the shifting cultivation was sustainable at least in the first year.
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