Abstract
This study monitored deposition and decomposition of cattle dung in a grazed young Chamaecyparis obtusa (an evergreen conifer) plantation in southwestern Japan, as a part of exploring the impacts of livestock in the forest grazing system. Animals defecated 10–19 times hd−1 day−1, producing feces of 2.2–3.5 kg DM and 33–73 g N per animal per day. The DM and N concentrations of feces ranged from 157–207 g DM kg−1 and 14.8−23.1 g (kg DM)−1, respectively. Occurrence of defecation was spatially heterogeneous, with feces being concentrated mainly on areas for resting (forest roads, ridges and valleys) and moving (forest roads and along fence lines). Decomposition of dung pats was considerably slow, showing the rates of 1.37–3.05 mg DM (g DM)−1 day−1 as DM loss. Decomposition was further slower on the basis of N release, 0.51–1.63 mg N (g N)−1 day−1, resulting in steadily increased N concentrations of dung pats with time after deposition. The results show that introduction of livestock into a forest (i.e., forest grazing) may limit nutrient availability to plants, by redistributing nutrients into areas with no vegetation (bare land and streams) and by establishing a large N pool as feces due to an imbalance between deposition and slow release, though further studies are necessary for investigating the occurrence of slow dung decomposition in other forest situations.
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Acknowledgments
We thank T. Iwamoto, Y. Kanda, D. Kiyota, N. Nakashima, N. Okada, W. Otozu, M. Furuse, N. Ozaki, R. Sato, T. Shiokawa, H. Yasuda, H. Hasegawa, Y. Nagakura, S. Gondo, T. Takahashi, R. Chowdappa and S. Ogura for assistance in field measurements and M. Takagi, Tano Forest Science Station, for providing the map of the study site.
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Hirata, M., Hasegawa, N., Nomura, M. et al. Deposition and decomposition of cattle dung in forest grazing in southern Kyushu, Japan. Ecol Res 24, 119–125 (2009). https://doi.org/10.1007/s11284-008-0488-y
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DOI: https://doi.org/10.1007/s11284-008-0488-y