NDLI: Soil and plant nitrogen pools in paddy and upland ecosystems have contrasting δ15N

Content Provider	Springer Nature Link
Author	Lim, Sang Sun Kwak, Jin Hyeob Lee, Kwang Seung Chang, Scott X. Yoon, Kwang Sik Kim, Han Yong Choi, Woo Jung
Copyright Year	2014
Abstract	Waterlogged paddy and water-unsaturated upland ecosystems have contrasting soil nitrogen (N) processes that affect the natural 15N abundance (15N/14N, expressed as δ15N) in different N pools. In this study, we investigated the δ15N patterns in soil and plant N pools of paddy and upland ecosystems. Samples were collected from 20 each of paddy and upland fields at the active growing season and analyzed for N concentration and δ15N. The higher (P < 0.001) concentration (22.1 mg N kg−1) and lower δ15N (6.9 ‰) of NH4 + in paddy than in upland soils (6.1 mg N kg−1 and 9.2 ‰, respectively) likely reflected the lower nitrification potential in paddy soils. On the other hand, a higher (P < 0.001) δ15N of NO3 − in paddy (12.7 ‰) than in upland soils (4.7 ‰) indicated higher denitrification rates in paddy soils. The positive (P < 0.01) correlation of the δ15N of soil organic N with the δ15N of NH4 + rather than with that of NO3 − suggested a tight linkage between organic N and NH4 + as a result of immobilization-mineralization turnover of NH4 +. Therefore, in waterlogged paddy soils where nitrification was restricted, a high rate of microbial immobilization-mineralization turnover might lead to a lower δ15N of soil N (total N, organic N, and NH4 +) than those for upland. The δ15N in plant N pools also reflected the dominant mineral N species in paddy (NH4 +) and upland soils (NO3 −). We conclude that contrasting soil N processes (particularly nitrification) leave distinct δ15N signatures in the soil and plant N pools between paddy and upland fields.
Starting Page	231
Ending Page	239
Page Count	9
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	51
Issue Number	2
e-ISSN	14320789
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-10-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Denitrification Nitrification Nitrogen isotope ratio Paddy Upland Agriculture Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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