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冬季的土壤呼吸是生态系统呼吸的重要组成部分,对气候变化的响应可能更为敏感。该文采用红外辐射加热器模拟土壤增温,研究了岷江上游华山松(Pinus armandii)人工林冬季的土壤呼吸、微生物生物量及无机氮库对模拟增温的响应。结果表明:在冬季(2009年11月–翌年3月),模拟增温往往能显著提高土壤呼吸速率,平均增幅达31.4%;同样模拟增温使土壤微生物生物量碳、氮分别增加23.2%和22.7%,而对微生物生物量碳氮比没有影响,温度升高显著促进了微生物的生长,但没有改变微生物的群落结构;增温样地土壤的NO3–-N和NH4+-N浓度较对照分别增加了38.5%和12.3%,增温显著提高了土壤的可溶性无机氮含量。综上所述,该区针叶林冬季土壤呼吸、微生物生长和养分矿化对未来气候变暖非常敏感。
Soil respiration in winter is an important part of ecosystem respiration and its response to climate change may be more sensitive. In this paper, infrared radiation heaters were used to simulate soil warming. The effects of soil respiration, microbial biomass and inorganic nitrogen pools on simulated warming in Pinus armandii plantation in the upper reaches of the Minjiang River were studied. The results showed that in winter (November 2009-March next year), simulated warming could often increase soil respiration rate by an average of 31.4%. Simulated warming increased soil microbial biomass C and N by 23.2% and 22.7%, respectively, but had no effect on microbial C / N ratio. The increase of temperature significantly promoted the growth of microorganisms, but did not change the community structure of microorganisms. The concentrations of NO3 - N and NH4 + -N in the warm - An increase of 38.5% and 12.3%, respectively. Increasing temperature significantly increased the content of soluble inorganic nitrogen in soil. In summary, the winter coniferous forest soil respiration, microbial growth and nutrient mineralization in the future are very sensitive to climate warming.