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采用动态密闭气室红外CO2分析法,对青藏高原东缘云杉人工林的土壤呼吸进行连续定位测定,并用挖壕沟法区分土壤自养呼吸和异养呼吸.结果表明:4种云杉林的土壤呼吸速率与土壤5cm层温度有显著的正指数关系,与土壤含水量的相关性不显著.4种云杉林土壤呼吸年通量在792.08～1070.20gC.m-2.a-1,大小依次为:天然云杉林>22年生云杉人工林>65年生云杉人工林>35年生云杉人工林,随着人工林的恢复呈先降低后升高的趋势.在森林恢复过程中,人工云杉土壤自养和异养呼吸年通量均先减少后增加,在253.36～357.05gC.m-2.a-1和538.69～703.82gC.m-2.a-1范围变化.22年生、35年生、65年生云杉人工林和天然云杉林非生长季(2007-11—2008-03)和生长季(2008-04—2008-10)的Q10值分别为:4.59、6.54、4.77、3.18和4.17、4.66、3.11、2.74.除22年生云杉人工林,Q10值随云杉林的恢复更新而逐渐降低,且非生长季节Q值均明显高于生长季节.
Using dynamic confined chamber infrared CO2 analysis method, the soil respiration of spruce plantations in the eastern edge of Qinghai-Tibet Plateau was determined continuously and the soil autotrophic respiration and heterotrophic respiration were distinguished by digging trenches.The results showed that: There was a significant positive exponential relationship between soil respiration rate and soil 5 cm layer temperature, but no significant correlation with soil water content. The annual respiration rate of soil respiration in the 4 spruce forest ranges from 792.08 to 1070.20 gC.m-2.a-1, The natural spruce forest> 22-year-old spruce plantation> 65-year-old spruce plantation> 35-year-old spruce plantation showed the trend of first decreasing and then increasing with the restoration of plantation.In the process of forest restoration, The annual and annual rates of autotrophic and heterotrophic respiration of Artemisia sphaerocephala decreased first and then increased, ranging from 253.36 to 357.05gC.m-2.a-1 and from 538.69 to 703.82gC.m-2.a-1. , The Q10 values of the non-growing season (2007-11-2008-03) and the growing season (2008-04-2008-10) of 65-year-old and 65-year-old spruce plantations and natural spruce forests were 4.59, 6.54 and 4.77 , 3.18 and 4.17, 4.66, 3.11 and 2.74, respectively. Except for the 22-year-old spruce plantation, the Q10 value gradually decreased with the restoration of the spruce forest, Significantly higher than the growing season.