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首页> 外文期刊>International Journal of Wildland Fire >Fire effects on gross inorganic N transformation in riparian soils in coniferous forests of central Idaho, USA: wildfires v. prescribed fires.
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Fire effects on gross inorganic N transformation in riparian soils in coniferous forests of central Idaho, USA: wildfires v. prescribed fires.

机译：火灾对美国爱达荷州中部针叶林河岸土壤总无机氮转化的影响：野火 v。规定的火灾。

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摘要

We investigated differences between wildfires and prescribed fires in their effects on nitrogen (N) dynamics in mineral soils collected from riparian coniferous forests of central Idaho, USA. Specifically, we investigated how the two types of fires affected inorganic N concentrations, microbial biomass N and gross transformation rates of inorganic N in mineral soils relative to their corresponding unburnt controls. There was no significant difference in soil NH4+ concentrations between burnt and control soils in either type of fires. However, wildfires significantly reduced gross ammonification and microbial NH4+ uptake rates relative to their controls (P=0.05 and 0.08). No such effect was found in soils burnt by the prescribed fires relative to their controls. Burnt soils had significantly higher NO3- concentrations than control soils when all the data were pooled (P=0.08). The elevated NO3- concentrations in the soils burnt by either type of fire were not caused by increased gross nitrification, but likely by significantly reduced microbial NO3- uptake (P<=0.02). We concluded that controlled prescribed fires conducted in early spring had less of an effect on soil N dynamics than wildfires in the region.
机译：我们调查了野火和指定火对美国爱达荷州中部沿河针叶林所收集的矿质土壤中氮（N）动态影响的差异。具体而言，我们调查了这两种火灾相对于未燃烧对照如何影响矿物土壤中无机氮的浓度，微生物生物量氮和无机氮的总转化率。在两种火灾中，烧过的土壤和对照土壤中的土壤NH 4 + 浓度均无显着差异。但是，野火相对于对照明显降低了总氨化水平和微生物NH 4 + 的吸收率（ P = 0.05和0.08）。相对于其对照，在规定的大火燃烧的土壤中未发现这种影响。汇总所有数据后，焚烧土壤的NO 3 -浓度显着高于对照土壤（ P = 0.08）。两种火烧过的土壤中NO 3 -浓度的升高并不是由总硝化作用的增加引起的，而是由微生物NO 3的显着减少引起的。 sub> -摄取（ P <= 0.02）。我们得出的结论是，早春进行的受控明火对该地区土壤N动态的影响小于该地区的野火。

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