摘要
近年来的研究表明非生长季生物活动和生物地球化学循环仍然十分活跃。本研究利用Licor-8100测定了2010-2013年期间的非生长季辽东山区落叶松人工林土壤呼吸速率,分析了非生长季内土壤呼吸速率变化规律及其对土壤温度的响应,并且估算了非生长季土壤CO2释放量。结果表明,2010-2011年土壤呼吸速率平均值为0.6±0.06μmol CO2·m-2·s-1,最小值出现在1月中旬;2011-2012年平均值为0.42±0.02μmol CO2·m-2·s-1,最小值出现在2月初;2012-2013年平均值为0.48±0.05μmol CO2·m-2·s-1,最小值出现在1月末。指数模型能够很好地模拟土壤呼吸速率随10 cm深度土壤温度变化的规律,表明土壤温度能够很好地解释土壤呼吸速率的变异规律。2010-2011、2011-2012和2012-2013年土壤CO2释放量分别为137、92和100 g C·m-2。
In recant years, there were several researches suggested that biological activity and the biogeochemical cycle in winter were very active. Soil respiration rate was measured by Licor-8100 for Larch plantations in dormant season during 2010 and 2013. The variation of soft respiration rate and its response to soil temperature in the dormant season were analyzed, and the soil CO2 emissions during these periods were estimated. The results showed the mean soil respiration rote in dormant season was 0.6±0.06 μmol CO2· m^-2· s^-1 during 2010 and 2011, the minimum value appeared in the middle of January; the mean value was 0.42±0.02 μmol CO2- m2. s^-1 during 2011 and 2012, the minimum value appeared in the early February; the mean value was 0.48±0.05 μmol CO2· m^-2· s^-1 during 2012 and 2013, the minimum value appeared in the late January. Exponential model was the best model to simulate the variation of soil respiration rate with soil temperature at 10 cm, suggested that variation of soil respiration rate could be significantly affected by soft temperature at 10 cm. The soil CO2 emissions during dormant season were 137 g C · m^-2 in 2010-2011 , 92 g C · m^-2 in 2011-2012 and 100 g C·m^-2 in 2012-2013 ,respectively.
出处
《辽宁林业科技》
2015年第1期20-22,52,共4页
Liaoning Forestry Science and Technology
基金
国家自然科学基金面上项目(31370616)
林业公益性行业科研专项(201204101
201404303)资助
关键词
辽东山区
落叶松人工林
非生长季
土壤呼吸
mountainous area in Eastern Liaoning province
Larch plantation
dormant season
soil respiration
