额济纳胡杨林土壤呼吸日间变化研究

发布时间：2018-05-19 03:13

本文选题：土壤呼吸 + 额济纳旗　；参考：《华北农学报》2016年S1期

【摘要】：为加强额济纳地区关于土壤碳通量的研究,探讨土壤呼吸对环境因子变化的响应,通过对额济纳胡杨林2015年生长季中9月与非生长季中11月的日间土壤呼吸速率变化的观测,对土壤呼吸与环境因子进行了分析,计算了日间土壤CO2释放量的实测值与拟合值。结果表明:9月与11月土壤日间平均CO2释放量实测值(171.18,37.27mmol/m2)稍高于拟合值(168.91,37.16 mmol/m2)。11月日间土壤呼吸平均值(0.94μmol/(m2·s))约为9月日间土壤呼吸平均值(4.32μmol/(m2·s))的22%。9月和11月额济纳胡杨林Q10值分别为1.61和1.99。土壤CO2释放量和土壤有机质、全氮含量及碳氮比均呈正相关。运用土壤温度和土壤体积含水量构建双因子回归模型,相较于用土壤温度或土壤体积含水量构建单因子回归模型,可以更好地解释土壤呼吸速率日间变化。考虑到碳收支平衡、降水量变化及气候变暖等因素,额济纳胡杨林土壤对气候变化有较好的适应性。
[Abstract]:In order to strengthen the study on soil carbon fluxes in Ejina area and to explore the response of soil respiration to environmental factors, the changes of soil respiration rate in mid-September and mid-November of 2015 growth season in Populus euphratica forest were observed. The soil respiration and environmental factors were analyzed, and the measured and fitted values of the daytime soil CO2 release were calculated. The results showed that the average daily CO2 release value in September and November was 171.18 卤37.27 mmol / m ~ (2) slightly higher than the fitting value (168.91 ~ 37.16 mmol 路m ~ (2). The average value of soil respiration in November was 0.94 渭 mol/(m2 路s ~ (-1), which was about 4.32 渭 mol/(m2 路s ~ (10) in September and November respectively. The Q10 values of Pinus euphratica forest in November were 1.61 and 1.99, respectively. There was a positive correlation between soil CO2 release and soil organic matter, total nitrogen content and C / N ratio. Compared with the single factor regression model of soil temperature and soil volume water content, the double-factor regression model can better explain the diurnal variation of soil respiration rate. Considering the balance of carbon budget, precipitation and climate warming, the soil of Populus euphratica forest has good adaptability to climate change.
【作者单位】：中国科学院西北生态环境资源研究院;中国科学院大学;兰州大学;
【基金】：国家自然基金面上项目(31370467)
【分类号】：S714

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