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首页> 美国卫生研究院文献>other >Influences of Land Use/Cover Types on Nitrous Oxide Emissions during Freeze-Thaw Periods from Waterlogged Soils in Inner Mongolia
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Influences of Land Use/Cover Types on Nitrous Oxide Emissions during Freeze-Thaw Periods from Waterlogged Soils in Inner Mongolia

机译：内蒙古淹水土壤冻融期土地利用/覆盖类型对一氧化二氮排放的影响

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Nitrous oxide emissions during freeze/thaw periods contribute significantly to annual soil N2O emissions budgets in middle- and high-latitude areas; however, the freeze/thaw-related N2O emissions from waterlogged soils have hardly been studied in the Hulunber Grassland, Inner Mongolia. For this study, the effects of changes in land use/cover types on N2O emissions during freeze–thaw cycles were investigated to more accurately quantify the annual N2O emissions from grasslands. Soil cores from six sites were incubated at varying temperature (ranging from −15 to 10°C) to simulate freeze–thaw cycles. N2O production rates were low in all soil cores during freezing periods, but increased markedly after soil thawed. Mean rates of N2O production differed by vegetation type, and followed the sequence: Leymus chinensis (LC) and Artemisia tanacetifolia (AT) steppes > LC steppes ≥ Stipa baicalensis (SB) steppes. Land use types (mowing and grazing) had differing effects on freeze/thaw-related N2O production. Grazing significantly reduced N2O production by 36.8%, while mowing enhanced production. The production of N2O was related to the rate at which grassland was mowed, in the order: triennially (M3) > once annually (M1) ≥ unmown (UM). Compared with the UM control plot, the M3 and M1 mowing regimes enhanced N2O production by 57.9% and 13.0% respectively. The results of in situ year-round measurements showed that large amounts of N2O were emitted during the freeze–thaw period, and that annual mean fluxes of N2O were 9.21 μg N2O-N m-2 h-1 (ungrazed steppe) and 6.54 μg N2O-N m-2 h-1 (grazed steppe). Our results further the understanding of freeze/thaw events as enhancing N2O production, and confirm that different land use/cover types should be differentiated rather than presumed to be equivalent, regarding nitrous oxide emission. Even so, further research involving multi-year and intensive measurements of N2O emission is still needed.
机译：冻结/解冻期的一氧化二氮排放量极大地影响了中高纬度地区的年度土壤N2O排放预算；但是，在内蒙古的呼伦贝尔草原上，几乎没有研究过淹水土壤中与冻结/融化有关的N2O排放。在本研究中，研究了冻融循环过程中土地利用/覆盖类型的变化对N2O排放的影响，以更准确地量化草地每年的N2O排放。将六个地点的土壤核心在不同的温度（-15至10°C）下孵育，以模拟冻融循环。在冻结期间，所有土壤核心的N2O生成率均较低，但在土壤融化后会显着增加。 N2O产生的平均速率因植被类型而异，并按照以下顺序排列：羊草（Leymus chinensis）（LC）和艾美蒿（AT）草原> LC草原≥Sticala baicalensis（SB）草原。土地用途类型（割草和放牧）对与冰冻/融化有关的N2O生产具有不同的影响。放牧大大减少了N2O的生产量达36.8％，同时割草提高了产量。 N2O的产生与割草的速率有关，其顺序为：每三年一次（M3）>每年一次（M1）≥未割除（UM）。与UM对照区相比，M3和M1割草方式分别将N2O产量提高了57.9％和13.0％。全年原位测量结果表明，冻融期排放大量N2O，N2O年平均通量为9.21μgN2O-N m -2 h -1 （湿磨的草原）和6.54μgN2O-N m -2 h -1 （湿磨的草原）。我们的结果进一步理解了冻结/融化事件会增加N2O的产生，并确认关于一氧化二氮的排放，应该区分不同的土地利用/覆盖类型，而不是假定它们是等效的。即便如此，仍然需要进行涉及N2O排放的多年和密集测量的进一步研究。

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