不同水分条件下巴音布鲁克天鹅湖高寒湿地土壤有机碳特征

发布时间：2018-06-19 03:28

本文选题：土壤有机碳 + 土壤呼吸　；参考：《湿地科学》2017年04期

【摘要】：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,p0.01)。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。
[Abstract]:The alpine wetland of Bayinbrook Swan Lake in Xinjiang was used as the study area. The dynamic monitoring of soil respiration rate was carried out in the plant growing season from June to October by using the infrared gas analyzer Li-8100. On August 16, 2014, when the plant biomass reached its maximum, plant and soil samples were collected to analyze the change of soil organic carbon content and biomass carbon accumulation. Using Fourier transform infrared spectrometer (FTIR), the changes of soil organic carbon functional groups were analyzed, and the characteristics and influencing factors of soil organic carbon under different water conditions (perennial hydrops, seasonal humid areas and perennial dry areas) were discussed. The results showed that the accumulation of organic carbon in the perennial hydrops was higher than that in the seasonal humid areas and the perennial dry areas, and the soil respiration rate in the seasonal humid areas [4.31 渭 mol/(m~2 s] was higher than that in the perennial dry areas [3.11 渭 mol/(m~2 s] and the perennial hydrops areas [1.01 渭 mol/(m~2 s]. In addition, the contents of fatty carbon, aromatic carbon and alkyl carbon in perennial stagnant soil were higher than those in seasonal humid area and perennial dry area. At the depth of 20 cm and 20 ~ 40 cm, soil respiration rate was negatively correlated with aromatic carbon, fatty carbon and alkyl carbon content, and the soil respiration rate was negatively correlated with the content of aromatic carbon, fatty carbon and alkyl carbon. The accumulation ability of soil organic matter is higher in perennial hydroponics area, which is beneficial to the accumulation of soil organic carbon.
【作者单位】：新疆农业大学草业与环境科学学院;新疆土壤与植物生态过程重点实验室;
【基金】：国家自然科学基金项目(31560171和41305136)资助
【分类号】：S153.6

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