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Sustainability 2017, 9(11), 1973; doi:10.3390/su9111973

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.
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)
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Abstract

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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