Abstract
Nitrogen (N) uptake and nitrogen use efficiency (NUE) are closely related through feedback mechanisms to soil N availability and N cycling in forested ecosystems. We investigated N uptake and NUE not only at the leaf, litterfall, and aboveground levels but also belowground and whole stand levels along a topographic gradient of soil N availability in a cool temperate deciduous forest in Japan. In this study, we addressed how whole stand level N uptake and NUE affect C and N cycling in forested ecosystems. At the leaf, litterfall, and aboveground levels, N uptake decreased and NUE increased with decreasing soil N availability. This pattern resulted from decreasing leaf N concentrations and increasing N resorption efficiencies as soil N availability declined. Low N concentrations in litterfall may have resulted in little soil N being available to plants, due to microbial immobilization. In contrast, when belowground components were included, N uptake and NUE were not correlated with soil N availability. This was mainly due to higher levels of fine root production when soil N availability was low. Higher fine root allocation can result in a high input of detritus to decomposer systems and, thus, contribute to accumulation of soil organic matter and immobilization by microbes, which may result in further soil N availability decline. Our results suggest that allocation to the fine root rather than whole stand level NUE is important for C and N cycling in forested ecosystems, as is the feedback mechanism in which litterfall level NUE shifts with changes in the N concentration of litterfall.
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Acknowledgments
We would like to thank Kyoto University Ashiu Forest Research Station for supporting for our study. We wish to thank Noriyuki Osada, Takashi Osono, Sachie Morozumi, Reiji Fujimaki, Takuo Hishi, Hiroyuki Ishii, Takanobu Aikawa, and the members of Laboratory of Forest Ecology, Graduate School of Agriculture, Kyoto University, for their very helpful suggestions on the manuscript and for assistance with fieldwork. This study was partly supported by a grant of (11213205 and 20780120) from the Japan Society for the Promotion of Science.
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Communicated by Jason Kaye.
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Tateno, R., Takeda, H. Nitrogen uptake and nitrogen use efficiency above and below ground along a topographic gradient of soil nitrogen availability. Oecologia 163, 793–804 (2010). https://doi.org/10.1007/s00442-009-1561-0
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DOI: https://doi.org/10.1007/s00442-009-1561-0