首页> 外文期刊>Biology and fertility of soils: Cooperating Journal of the International Society of Soil Science >Effects of warming and increased precipitation on soil carbon mineralization in an inner Mongolian grassland after 6 years of treatments.
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Effects of warming and increased precipitation on soil carbon mineralization in an inner Mongolian grassland after 6 years of treatments.

机译:处理6年后,变暖和降水增加对内蒙古内蒙古草原土壤碳矿化的影响。

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Understanding the responses of soil C mineralization to climate change is critical for evaluating soil C cycling in future climatic scenarios. Here, we took advantage of a multifactor experiment to investigate the individual and combined effects of experimental warming and increased precipitation on soil C mineralization and 13C and 15N natural abundances at two soil depths (0-10 and 10-20 cm) in a semiarid Inner Mongolian grassland since April 2005. For each soil sample, we calculated potentially mineralizable organic C (C0) from cumulative CO2-C evolved as indicators for labile organic C. The experimental warming significantly decreased soil C mineralization and C0 at the 10-20-cm depth (P<0.05). Increased precipitation, however, significantly increased soil pH, NO3--N content, soil C mineralization, and C0 at the 0-10-cm depth and moisture and NO3--N content at the 10-20-cm depth (all P<0.05), while significantly decreased exchangeable NH4+-N content and 13C natural abundances at the two depths (both P<0.05). There were significant warming and increased precipitation interactions on soil C mineralization and C0, indicating that multifactor interactions should be taken into account in future climatic scenarios. Significantly negative correlations were found between soil C mineralization, C0, and 13C natural abundances across the treatments (both P<0.05), implying more plant-derived C input into the soils under increased precipitation. Overall, our results showed that experimental warming and increased precipitation exerted different influences on soil C mineralization, which may have significant implications for C cycling in response to climate change in semiarid and arid regions.
机译:了解土壤碳矿化对气候变化的响应对于评估未来气候情景中的土壤碳循环至关重要。在这里,我们利用多因素实验研究了半干旱内陆两个土壤深度(0-10和10-20 cm)下实验性增暖和降水增加对土壤C矿化以及13C和15N自然丰度的个体和综合影响自2005年4月以来的蒙古草原。对于每种土壤样品,我们从累积的CO 2 -C演变为不稳定有机C的指标计算出了潜在可矿化的有机C(C 0 )。实验升温明显降低了10-20cm深度的土壤碳矿化和C 0 (P <0.05)。降水增加,但是在0-10时土壤pH,NO 3 - -N含量,土壤C矿化和C 0 显着增加。 -cm深度和水分以及10-20-cm深度的NO 3 - -N含量(均P <0.05),而可交换NH 4显着降低 + -N含量和两个深度处的13C自然丰度(均P <0.05)。在土壤碳矿化和C 0 上存在明显的变暖和降水相互作用,这表明在未来的气候情景中应考虑多因素相互作用。在处理过程中,土壤碳矿化度,C 0 和13C自然丰度之间存在显着的负相关性(均为P <0.05),这意味着在降水增加的情况下,更多的植物源性C输入土壤。总体而言,我们的结果表明,实验性变暖和降水增加对土壤碳矿化有不同的影响,这可能对半干旱和干旱地区响应气候变化的碳循环产生重大影响。

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