Effects of acetylene at low concentrations on nitrification, mineralization and microbial biomass nitrogen concentrations in forest soils
Effects of acetylene at low concentrations on nitrification, mineralization and microbial biomass nitrogen concentrations in forest soils
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低浓度乙炔对森林土壤硝化、矿化和微生物量氮浓度的影响
DOI：
10.1007/s11434-008-0470-7
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Pan GenXing
中科院分区：
文献类型：
--
作者：
Luo XianBao;Zhang TengYu;Xu XingKai;Wang YingHong;Han Lin;Pan GenXing
距主干不同距离的温带森林表层土壤（例如，以红松（Pinus koraiensis）和蒙古栎（Quercus mongolica）为试材，研究了低浓度乙炔（C2 H2）对土壤硝化作用、矿化作用和微生物量氮浓度的影响，以及异养硝化作用对土壤N2 O排放的贡献。乙炔的使用在分压范围内从10至100帕C2 H2的顶空气体给出了一个显着减少N2 O排放在土壤水分ofc。低浓度C2 H2暴露后，各土壤孔隙度的降低幅度基本一致。异养硝化作用可占各土壤N2 O排放总量的21%~ 48%，其贡献随距离红松林的增加而增加，而随距离蒙古栎林的增加而增加。在本试验条件下，低浓度C2 H2对土壤微生物量氮、净氮矿化量和微生物呼吸作用无显著影响。而100 Pa的顶空气体C2 H2可以减少土壤CO2的排放。根据森林土壤对10 Pa C2 H2的快速消耗和实验室培养的方便性，利用50 Pa顶空气体可以研究好氧条件下森林土壤N2 O排放的来源及其驱动机制。距蒙古栎树干相同距离的土壤N_2O和CO_2排放量均大于红松树干，且随距树干距离的增加，土壤N_2O和CO_2排放量均减少。逐步回归分析表明，土壤全C、水溶性有机C和pH值对土壤CO2排放的变异性贡献率为95%;土壤全N对土壤N2 O排放的变异性贡献率为72%。土壤微生物生物量氮浓度对异养硝化作用的影响约为25%。低浓度C_2H_2暴露后，森林土壤N_2O和CO_2排放量与土壤净硝化作用呈正相关。
Temperate forest surface soils at the varying distances from main trunks (e.g.,Pinus koraiensisandQuercus mongolica) were used to study the effects of acetylene (C2H2) 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 (N2O) emissions from soils. The use of acetylene at partial pressures within a range from 10 to 100 Pa C2H2in headspace gas gave a significant decrease in N2O emission at soil moisture ofc. 45% water-filled porosity space, and the decrease was almost the same in each soil after exposure of C2H2at low concentrations. Heterotrophic nitrification could account for 21%–48% of total N2O emission from each soil; the contribution would increase with increasing distances from thePinus koraiensistrunks rather than from theQuercus mongolicatrunks. Under the experimental conditions, the use of C2H2at low concentrations showed no significant influence on soil microbial biomass N, net N mineralization and microbial respiration. However, 100 Pa C2H2in headspace gas could reduce carbon dioxide (CO2) emissions from soils. According to the rapid consumption of 10 Pa C2H2by forest soils and convenience for laboratory incubations, 50 Pa C2H2in headspace gas can be used to study the origin of N2O emissions from forest soils under aerobic conditions and the key associated driving mechanisms. The N2O and CO2emissions from the soils at the same distances from theQuercus mongolicatrunks were larger than those from thePinus koraiensistrunks, and both emissions decreased as the distances from trunks increased. The stepwise regression analysis showed that 95% of the variability in soil CO2emissions 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 N2O emissions could be accounted for by the concentrations of soil total N, exchangeable NH4+-N and microbial biomass N and 25% of the variability in heterotrophic nitrification by the soil microbial biomass N concentration. The emissions of N2O and CO2from forest soils after exposure of C2H2at low concentrations were positively related to the net nitrification of the soils.
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影响因子：
9.7
作者：
Herrmann, Anke M.;Witter, Ernst;Kaetterer, Thomas
通讯作者：
Kaetterer, Thomas
影响因子：
6.5
作者：
D. Hatch;S. Jarvis;R. Parkinson;R. Lovell
通讯作者：
D. Hatch;S. Jarvis;R. Parkinson;R. Lovell
影响因子：
4.4
作者：
J. Schimel;M. Firestone;K. Killham
通讯作者：
J. Schimel;M. Firestone;K. Killham
影响因子：
2
作者：
Xingkai Xu;Lin Han;Yuesi Wang;K. Inubushi
通讯作者：
Xingkai Xu;Lin Han;Yuesi Wang;K. Inubushi
影响因子：
6.5
作者：
A. Bollmann;R. Conrad
通讯作者：
A. Bollmann;R. Conrad