NDLI: Effects of acetylene at low concentrations on nitrification, mineralization and microbial biomass nitrogen concentrations in forest soils

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Effects of acetylene at low concentrations on nitrification, mineralization and microbial biomass nitrogen concentrations in forest soils

Content Provider	Springer Nature Link
Author	Zhang, TengYu Xu, XingKai Luo, XianBao Han, Lin Wang, YingHong Pan, GenXing
Copyright Year	2008
Abstract	Temperate forest surface soils at the varying distances from main trunks (e.g., Pinus koraiensis and Quercus mongolica) were used to study the effects of acetylene (C$_{2}$H$_{2}$) at low concentrations on nitrification, mineralization and microbial biomass N concentrations of the soils, and to assess the contribution of heterotrophic nitrification to nitrous oxide (N$_{2}$O) emissions from soils. The use of acetylene at partial pressures within a range from 10 to 100 Pa C$_{2}$H$_{2}$ in headspace gas gave a significant decrease in N$_{2}$O emission at soil moisture of c. 45% water-filled porosity space, and the decrease was almost the same in each soil after exposure of C$_{2}$H$_{2}$ at low concentrations. Heterotrophic nitrification could account for 21%–48% of total N$_{2}$O emission from each soil; the contribution would increase with increasing distances from the Pinus koraiensis trunks rather than from the Quercus mongolica trunks. Under the experimental conditions, the use of C$_{2}$H$_{2}$ at low concentrations showed no significant influence on soil microbial biomass N, net N mineralization and microbial respiration. However, 100 Pa C$_{2}$H$_{2}$ in headspace gas could reduce carbon dioxide (CO$_{2}$) emissions from soils. According to the rapid consumption of 10 Pa C$_{2}$H$_{2}$ by forest soils and convenience for laboratory incubations, 50 Pa C$_{2}$H$_{2}$ in headspace gas can be used to study the origin of N$_{2}$O emissions from forest soils under aerobic conditions and the key associated driving mechanisms. The N$_{2}$O and CO$_{2}$ emissions from the soils at the same distances from the Quercus mongolica trunks were larger than those from the Pinus koraiensis trunks, and both emissions decreased as the distances from trunks increased. The stepwise regression analysis showed that 95% of the variability in soil CO$_{2}$ emissions could be accounted for by the concentrations of soil total C and water soluble organic C and soil pH, and that 72% of the variability in soil N$_{2}$O emissions could be accounted for by the concentrations of soil total N, exchangeable NH$_{4}$ $^{+}$-N and microbial biomass N and 25% of the variability in heterotrophic nitrification by the soil microbial biomass N concentration. The emissions of N$_{2}$O and CO$_{2}$ from forest soils after exposure of C$_{2}$H$_{2}$ at low concentrations were positively related to the net nitrification of the soils.
Starting Page	296
Ending Page	303
Page Count	8
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	54
Issue Number	2
e-ISSN	18619541
Language	English
Publisher	SP Science in China Press
Publisher Date	2008-11-03
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	heterotrophic nitrification forest soil acetylene mineralization microbial biomass nitrogen Engineering Earth Sciences Chemistry/Food Science Physics Life Sciences Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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