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以长白山针叶林和阔叶林2种林型的2个土壤层次(A层与O层)为供试土样,分别于30℃恒温(恒高)、10℃恒温(恒低)、10~30℃循环变温条件下的变温低温(变低)和变温高温(变高)进行4个月室内培养,测定不同时期土壤呼吸速率(RS),并藉此计算恒、变温模式Q_(10)值。研究表明,不同处理RS一致呈现变低<恒低,变高>恒高(P<0.001),且变温模式Q_(10)(均值2.23)明显高于恒温处理Q_(10)(均值1.51)(P<0.001)。不同林型或土层RS对温度变化敏感程度不同,呈现针叶林变幅略大于阔叶林,A层比O层变化更为强烈。上述差异可能与恒、变温培养模式下土壤微生物群落结构和底物可用性变异有关。因此,在测算土壤呼吸Q_(10)时应考虑温度变化所带来的影响。
Two soil layers (layer A and layer O) of coniferous forest and broad-leaved forest in Changbai Mountains were used as test soil samples. The soil samples were stored at 30 ℃, constant temperature, 10 ℃, 10 The soil respiration rate (RS) at different periods was measured after incubation for 4 months under the conditions of temperature-to-low temperature (low temperature) and high temperature (high temperature) value. The results showed that the RS of different treatments showed a trend of decreasing from low to high and high to high (P <0.001), and Q 10 (mean 2.23) was significantly higher than Q 10 (mean 1.51) P <0.001). The RS of different forest types or soil layers is sensitive to temperature changes, showing that the amplitude of coniferous forest is slightly larger than that of broadleaf forest, and the change of layer A is more intense than that of layer O. The above differences may be related to the variation of soil microbial community structure and substrate availability under constant and variable temperature cultivation modes. Therefore, the effect of temperature change should be considered when calculating soil respiration Q_ (10).