NDLI: Heterotrophic nitrification is the predominant NO 3 − production mechanism in coniferous but not broad-leaf acid forest soil in subtropical China

Content Provider	Springer Nature Link
Author	Zhang, Jinbo Müller, Christoph Zhu, Tongbin Cheng, Yi Cai, Zucong
Copyright Year	2011
Abstract	A study was carried out to investigate the potential gross nitrogen (N) transformations in natural secondary coniferous and evergreen broad-leaf forest soils in subtropical China. The simultaneously occurring gross N transformations in soil were quantified by a 15N tracing study. The results showed that N dynamics were dominated by NH 4 + turnover in both soils. The total mineralization (from labile and recalcitrant organic N) in the broad-leaf forest was more than twice the rate in the coniferous forest soil. The total rate of mineral N production (NH 4 + + NO 3 − ) from the large recalcitrant organic N pool was similar in the two forest soils. However, appreciable NO 3 − production was only observed in the coniferous forest soil due to heterotrophic nitrification (i.e. direct oxidation of organic N to NO 3 − ), whereas nitrification in broad-leaf forest was little (or negligible). Thus, a distinct shift occurred from predominantly NH 4 + production in the broad-leaf forest soil to a balanced production of NH 4 + and NO 3 − in the coniferous forest soil. This may be a mechanism to ensure an adequate supply of available mineral N in the coniferous forest soil and most likely reflects differences in microbial community patterns (possibly saprophytic, fungal, activities in coniferous soils). We show for the first time that the high nitrification rate in these soils may be of heterotrophic rather than autotrophic nature. Furthermore, high NO 3 − production was only apparent in the coniferous but not in broad-leaf forest soil. This highlights the association of vegetation type with the size and the activity of the SOM pools that ultimately determines whether only NH 4 + or also a high NO 3 − turnover is present.
Starting Page	533
Ending Page	542
Page Count	10
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	47
Issue Number	5
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	15N tracing technique Model Labile and recalcitrant organic N Gross N transformation Heterotrophic nitrification Soil Science & Conservation Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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