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首页> 外文期刊>Ecological research >The combined effects of warming and drying suppress CO_2 and N_2O emission rates in an alpine meadow of the eastern Tibetan Plateau
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The combined effects of warming and drying suppress CO_2 and N_2O emission rates in an alpine meadow of the eastern Tibetan Plateau

机译：青藏高原东部高寒草甸暖化与干燥的综合作用抑制了CO_2和N_2O的排放

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摘要

The eastern Tibetan Plateau has become increasingly warmer and drier since the 1990s. Such warming and drying has a great impact on ecosystem processes on the eastern Tibetan Plateau. To determine their combined effects on CO_2 and N_2O emission rates, we conducted a field manipulative experiment in an alpine meadow of the eastern Tibetan Plateau during the growing season of 2009. The experiment showed that warming manipulation increased soil temperature by 1 ℃, and drying manipulation decreased soil water content by 6.8 %. We found that by counteracting the effect of low temperature in the area, experimental warming significantly increased soil microbial biomass, the number of bacteria, fungi, actinomycetes, ammonifying bacteria, nitrobacteria and denitrifying bacteria, and facilitated the emission rates of CO_2 and N_2O by 33.4 and 31.5 %, respectively. However, decreased precipitation further aggravated soil water stress and inhibited the numbers of these organisms, and reduced the emission rates of CO_2 and N_2O by 47.4 and 37.9 %, respectively. So decreased soil water content tended to offset the positive effect of warming. Compared to the positive effects of warming, decreased soil water content was shown in our study to have even greater impact on the eastern Tibetan Plateau during the growing season. Therefore, inhibition of CO_2 and N_2O emission rates (32.3 and 29.3 %, respectively) by warming and drying will intensify if the combined effects of these climatic trends persist in the region.
机译：自1990年代以来，东部青藏高原变得越来越温暖和干燥。这种变暖和干燥对青藏高原东部的生态系统过程有很大影响。为了确定它们对CO_2和N_2O排放速率的综合影响，我们在2009年生长期的青藏高原东部高寒草甸进行了田间操作试验。该试验表明，升温操作使土壤温度升高1℃，而干燥操作减少了6.8％的土壤水分含量。我们发现，通过抵消该地区的低温影响，实验性升温显着增加了土壤微生物生物量，细菌，真菌，放线菌，氨化细菌，硝化细菌和反硝化细菌的数量，并使CO_2和N_2O的排放速率提高了33.4。和31.5％。然而，降水的减少进一步加剧了土壤水分胁迫，抑制了这些生物的数量，并使CO_2和N_2O的排放率分别降低了47.4％和37.9％。因此减少的土壤水分倾向于抵消变暖的积极影响。与变暖的积极影响相比，在我们的研究中，土壤水含量的降低对生长期期间对青藏高原东部的影响更大。因此，如果这些气候趋势的综合影响在该地区持续存在，那么变暖和干燥对CO_2和N_2O排放速率的抑制作用（分别为32.3％和29.3％）将会加剧。

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  • 来源
    《Ecological research》 |2012年第4期|p.725-733|共9页
  • 作者

    Fusun Shi; Huai Chen; Huafeng Chen; Yan Wu; Ning Wu;

  • 作者单位

    Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, People's Republic of China;

    Laboratory for Ecological Forecasting and Global Change, College of Forestry, Northwest Agriculture and Forest University, Yanglin 712100, People's Republic of China;

    Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China;

    Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, People's Republic of China;

    Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    warming; drying; CO_2; N_2O; eastern tibetan plateau;

    机译：变暖;烘干;CO_2;N_2O;东藏高原;

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