中文摘要：

土壤呼吸是陆地生态系统和大气生态系统之间碳转移的主要途径之一。以澳大利亚南昆士兰州典型森林类型湿地松、南洋杉和贝壳杉林为对象,开展土壤可溶性有机碳和氮（SOC和SON）以及土壤呼吸特性研究。结果表明：不同森林土壤SOC、SON含量分别在64.4~166.5 mg/kg和6.04~14.2 mg/kg,且贝壳杉和南洋杉的SON含量显著高于湿地松（P〈0.05）。经过21 d室内培养,以贝壳杉林地土壤呼吸程度最强,21 d潜在有机碳矿化（potential mineralizable organic carbon。Cm）CO2-C为214.96 g/kg,其次南洋杉林CO2-C为182.22 g/kg,均显著强于湿地松林CO2-C 166.14 g/kg（P〈0.05）。贝壳杉林地土壤潜在最大有机碳矿化（maximum poten-tial mineralizable organic carbon,C0）最高,为1 117.8;其次为南洋杉,C0为1 082.1,湿地松林土壤C0最低,为783.0。土壤呼吸速率格局与土壤呼吸一致。相关分析表明,C0与Cm、C∶NMicro和pH之间,Cm与pH之间差异显著相关（P〈0.01）,土壤pH、TC和含水量是土壤呼吸的调控因子。

英文摘要：

Soil respiration is one of the main way for carbon transfer between terrestrial and atmosphere ecosystems. Soil samples under the slash pine （Pinus elliottii Engelm. vat. elliotttii）, hoop pine （Araucaria cunninghamii ） and kauri pine （Agathis australis） populations in southern Queensland Australia were collected to investigate the effects of forest types on soil soluble organic carbon （ SOC）, nitrogen （SON） as well as soil respiration. The results showed that the SOC and SON contents of soil were 64.4 - 166.5 mg/kg, and 6.04 14.2 mg/kg, respectively. In addition, soil SON contents under the hoop pine and kauri pine were significantly higher than under the slash pine （P 〈 0.05 ）. After 21 d incubation, the soil respiration was the strongest under kauri pine,the potential mineralizable organic carbon （Cm） was 214.96 g CO2-C kg. The second was 182.22 g CO2 - C kg in hoop pine. Their contents were significantly higher than that in slash pine, which was 166.14 g CO2 - C kg （ P 〈 0.05 ）. The order of maximum potential carbon mineralization （ CO ） was 1 117.8 in kauri pine, the second was 1 082.1 in hoop pine, and the lowest was 783.0 in slash pine. The soil respiration was similar to soil respiration rate. Correlation analysis showed that difference was significantly correlated between Co and C C： Nnicro and pH, and between Cm and pH （P 〈0.01 ）. pH, TC and moisture were factors in the control of soil respiration.