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首页> 外文期刊>Applied Soil Ecology >Additive effects of earthworms, nitrogen-rich litter and elevated soil temperature on N2O emission and nitrate leaching from an arable soil
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Additive effects of earthworms, nitrogen-rich litter and elevated soil temperature on N2O emission and nitrate leaching from an arable soil

机译：,、富氮垫料和土壤温度升高对耕地土壤N2O排放和硝态氮淋溶的累加作用

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The future nicrease of soil temperatures will affect the activity of decomposer organisms, potentially enhancing element cycling and greenhouse gas (i.e. CO2 and N2O) emissions. In a three-factorial microcosm experiment, we investigated the effects of the incorporation of N-rich green manure litter (Phacelia tanacetifolia Benth.) into an arable soil, of the presence of endogeic earthworms and of elevated soil temperatures (+3.5 degrees C) on C and N cycling over a period of 42 days. Effects of litter addition were most pronounced. Litter strongly increased amounts of mineral and organic N in the leachate, soil extractable mineral and organic N and organic C, denitrification activity, CO2 and N2O emissions as well as earthworm biomass. Elevated soil temperatures also increased CO2 emissions, but this effect was more pronounced in treatments without litter. Furthermore, elevated soil temperature reduced the amounts of extractable organic C and NH4+, but increased amounts of NO3-, indicating enhanced nitrification activity in warmed soils. Earthworm presence increased NO3- leaching and this was more pronounced under elevated soil temperatures. N2O emissions were strongly increased by 70-90% by earthworm activity, with the highest emissions in the treatment with litter incorporation under elevated temperatures. This treatment also had the largest amount of NO3- leaching and the highest denitrification activities. Our results indicate an increasing risk for N losses in the form of nitrate leaching and/or N2O emissions from earthworm populated arable soils with a warmer climate in the future. (C) 2014 Elsevier B.V. All rights reserved.
机译：未来土壤温度的降低会影响分解生物的活动，可能会增加元素循环和温室气体（即CO2和N2O）的排放。在三因素微观实验中，我们研究了将富含N的绿肥垃圾（Phacelia tanacetifolia Benth。）掺入可耕土壤，存在内ge和升高土壤温度（+3.5摄氏度）的影响在42天的C和N循环中垫料添加的影响最为明显。垃圾大大增加了渗滤液中的矿物质和有机氮，土壤中可提取的矿物质和有机氮以及有机碳，反硝化活性，CO2和N2O排放以及worm的生物量。升高的土壤温度也增加了二氧化碳的排放，但是这种效果在不带垃圾的处理中更为明显。此外，升高的土壤温度降低了可萃取有机碳和NH4 +的含量，但增加了NO3-的含量，表明在温暖的土壤中硝化活性增强。 presence的存在增加了NO3的浸出，这在土壤温度升高的情况下尤为明显。通过worm的活动，N2O排放量大大增加了70-90％，在高温下掺入垫料的处理中排放量最高。该处理还具有最大量的NO 3浸出和最高的反硝化活性。我们的结果表明，未来气候变暖的worm种群耕作土壤中以硝酸盐浸出和/或N2O排放的形式造成的氮损失风险增加。 （C）2014 Elsevier B.V.保留所有权利。

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