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Open AccessArticle

Land Use Alters the Plant-Derived Carbon and Nitrogen Pools in Terraced Rice Paddies in a Mountain Village

1
Memuro Research Station, Hokkaido Agricultural Research Center, National Agriculture and Food Research Organization (NARO/HARC/M), Shinsei, Memuro, Kasai, Hokkaido 082-0081, Japan
2
Field Studies Institute for Environmental Education, Tokyo Gakugei University, 4-1-1 Nukuikitamachi, Koganeishi, Tokyo 184-0015, Japan
*
Author to whom correspondence should be addressed.
Sustainability 2017, 9(11), 1973; https://doi.org/10.3390/su9111973
Received: 27 September 2017 / Revised: 17 October 2017 / Accepted: 26 October 2017 / Published: 28 October 2017
(This article belongs to the Special Issue Carbon Input into Agricultural Soils)
In Japan, terraced paddies in mountain villages are symbolic of the traditional landscape, but they are gradually being abandoned. To compare plant-derived C and N among land uses, we compared adjacent forest floor (FF), agricultural paddy (AP), and post-agricultural paddy (PP) sites. Long-term litter accumulation could explain the significantly higher litter C and belowground biomass C in FF than in AP and PP. The low-density-fraction (LF) soil C was significantly higher in FF than in PP and better reflected land use than the whole-soil C. The AP soil held more N than FF and PP at 20–30 cm, associated with higher LF soil N. Periodic tillage in AP maintains the LF soil N, but N supplied to the surface soil reduced with depth following abandonment. Differences in recycling of organic matter and nutrients among land uses are crucial to plant-derived C and N contents of soil. View Full-Text
Keywords: land use; paddy; soil carbon; agricultural abandonment land use; paddy; soil carbon; agricultural abandonment
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Shimoda, S.; Koyanagi, T.F. Land Use Alters the Plant-Derived Carbon and Nitrogen Pools in Terraced Rice Paddies in a Mountain Village. Sustainability 2017, 9, 1973.

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