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以新疆巴音布鲁克天鹅湖高寒湿地为研究区,利用红外气体分析仪(Li-8100),于植物生长季6~10月,进行野外土壤呼吸速率动态监测;在2014年8月16日(植物生物量达到最大时),采集植物和土壤样品,分析土壤有机碳含量变化和生物量碳蓄积状况。利用傅里叶变换红外光谱仪(FTIR),对土壤有机碳官能团变化特征进行分析,探讨不同水分条件下(常年积水区、季节性湿润区和常年干燥区)土壤有机碳特征及其影响因素。结果表明,常年积水区各类型有机碳储量都高于季节性湿润区和常年干燥区;季节性湿润区的土壤呼吸速率[4.31μmol/(m~2·s)]高于常年干燥区[3.11μmol/(m~2·s)]和常年积水区[1.01μmol/(m~2·s)]。此外,常年积水区土壤脂肪碳、芳香碳和烷基碳含量都高于季节性湿润区和常年干燥区。在0~20 cm和20~40 cm深度,土壤呼吸速率与芳香碳、脂肪碳和烷基碳含量都显著负相关(n=15,p<0.01)。常年积水区土壤具有较高的有机物质蓄积能力,有利于土壤有机碳的累积。
Based on the alpine wetland of Bayanbuluke Lake Swan Lake in Xinjiang Uygur Autonomous Region, the infrared gas analyzer (Li-8100) was used to monitor the soil respiration rate from June to October in the plant growth season. On August 16, 2014 At the maximum biomass, plant and soil samples were collected and analyzed for soil organic carbon content and biomass carbon accumulation. The characteristics of soil organic carbon functional groups were analyzed by Fourier transform infrared spectroscopy (FTIR), and the characteristics of soil organic carbon under different water conditions (perennial stagnant water area, seasonal wetting area and perennial dry area) and their influencing factors were discussed. The results showed that all types of organic carbon storage in the perennial water area were higher than those in the seasonal humid area and the perennial dry area. The soil respiration rate in the seasonal humid area [4.31μmol / (m ~ 2 · s)] was higher than that in the perennial dry area [ 3.11μmol / m ~ 2 · s] and perennial stagnant water [1.01μmol / (m ~ 2 · s)]. In addition, the content of soil aliphatic carbon, aromatic carbon and alkyl carbon in the perennial stagnant water area were higher than those in the seasonal moist area and perennial dry area. At 0-20 cm and 20-40 cm depths, soil respiration rate was significantly negatively correlated with aromatic carbon, aliphatic carbon and alkyl carbon (n = 15, p <0.01). The perennial ponding soil has higher organic matter accumulation capacity, which is beneficial to the accumulation of soil organic carbon.