科尔沁草甸草地土壤呼吸特征  

Characteristics of Soil Respiration on Horqin Meadow

作　　者：陈妮娜[1,2] 关德新[1] 金昌杰[1] 袁凤辉[1,2] 杨弘[1] 

机构地区：[1]森林与土壤生态国家重点实验室/中国科学院沈阳应用生态研究所,辽宁沈阳110016 [2]中国科学院研究生院,北京100049

出　　处：《中国草地学报》2011年第5期82-87,共6页Chinese Journal of Grassland

基　　金：国家自然科学基金(40875069);国家科技支撑项目(2006BAC01A12;2006BAD03A0502)

摘　　要：在2010年，利用便携式CO2分析仪（Li-6400）对科尔沁草甸草地生态系统土壤呼吸进行测定，并根据同步观测的温度数据建立了土壤呼吸与土壤温度的关系模型。结果表明：土壤呼吸速率口变化表现为单峰型，最高值出现在下午14：00左右，最低值出现在凌晨；季节变化为夏季最大，为6．70～15．29f,mol·m^-1·s^-1，冬季最小，为0．02～3．21μmol·m^-2·s^-1；土壤呼吸速率与土壤5cm温度呈显著指数相关，土壤温度能反映该草甸草地土壤呼吸的78．7％，Q10值为2．88；根呼吸约占土壤总呼吸的6．6％～29．4％，平均值为18．9％。Soil respiration was measured on Horqin meadow ecosystem during 2010 using a portable photosynthesis system （Li-6400）. A model between soil respiration and soil temperature measured syn- chronously was set up. The results showed that diurnal variation of soil respiration was a one-humped curve, the highest value occurred at about 14：00, the lowest value occurred in the early morning. Soil res piration was the highest in summer, varied between 6.70 and 15.29 μmol · m^-1 · s^-1 , the lowest in winter, varied from 0.02 to 3.21 μmol ·m^-2· s^-1. The relationship between soil respiration and soil temperature at 5 cm in depth was exponentially correlated. Soil temperature can indicate 81.9% of soil respiration on the meadow ecosystem. The Q10 value was 2.92. The ratio of root respiration to soil respiration was 6.6% 29.4o/00, with an average of 18.9%.

关 键 词：土壤呼吸 Q10值 指数方程 草甸草地 

分 类 号：S812.2[农业科学—草业科学]