soil nitrogen transformation responses to seasonal precipitation changes are regulated by changes in functional microbial abundance in a subtropical forest
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2017
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Abstract
The frequency of dry-season droughts and wet-season storms has been predicted to increase in subtropical areas in the coming decades. Since subtropical forest soils are significant sources
of N2O and NO3−, it is important to understand the features and
determinants of N transformation responses to the predicted precipitation
changes. A precipitation manipulation field experiment was conducted in a
subtropical forest to reduce dry-season precipitation and increase wet-season
precipitation, with annual precipitation unchanged. Net N mineralization, net
nitrification, N2O emission, nitrifying (bacterial and archaeal
amoA) and denitrifying (nirK, nirS and
nosZ) gene abundance, microbial biomass carbon (MBC), extractable
organic carbon (EOC), NO3−, NH4+ and soil water content (SWC)
were monitored to characterize and explain soil N transformation responses.
Dry-season precipitation reduction decreased net nitrification and N
mineralization rates by 13–20 %, while wet-season precipitation addition
increased both rates by 50 %. More than 20 % of the total variation
of net nitrification and N mineralization could be explained by microbial
abundance and SWC. Notably, archaeal amoA abundance showed the
strongest correlation with net N transformation rates (r ≥ 0.35),
suggesting the critical role of archaeal amoA abundance in
determining N transformations. Increased net nitrification in the wet season,
together with large precipitation events, caused substantial NO3−
losses via leaching. However, N2O emission decreased moderately in both
dry and wet seasons due to changes in nosZ gene abundance, MBC, net
nitrification and SWC (decreased by 10–21 %). We conclude that reducing
dry-season precipitation and increasing wet-season precipitation affect soil
N transformations through altering functional microbial abundance and MBC,
which are further affected by changes in EOC and NH4+ availabilities.
| Reference Key |
chen2017biogeosciencessoil
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|---|---|
| Authors | ;J. Chen;G. Xiao;Y. Kuzyakov;G. D. Jenerette;Y. Ma;W. Liu;Z. Wang;W. Shen |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-2513-2017
|
| URL | |
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