武夷山不同海拔植被土壤呼吸季节变化及对温度的敏感性

以武夷山国家级自然保护区为实验基地，研究了4种不同海拔高度上植物群落土壤呼吸速率的季节变化及其对温度的敏感性，以及与主要环境因子的关系.结果表明：4种不同海拔植物群落的土壤呼吸速率均具有明显且一致的季节变化，其中夏季土壤呼吸速率最大，为3.10～6.57 μmol CO₂·m^-2·s^-1，冬季最小，为0.27～1.15 μmol CO₂·m^-2·s^-1；土壤呼吸速率与土壤温度呈显著指数相关，不同样地土壤呼吸速率与土壤含水率和凋落物输入量的关系各不相同；高海拔地区土壤呼吸的Q₁₀值显著高于低海拔地区.在中亚热带地区，不同海拔土壤呼吸速率的季节波动主要受土壤温度的影响；在未来全球气候变暖的背景下，高海拔地区的土壤可能释放更多的CO₂.

Seasonal variation and temperature sensitivity of soil respiration under different plant communities along an elevation gradient in Wuyi Mountains of China.

Taking the National Nature Reserve in Wuyi Mountains as experimental site, the seasonal variation and temperature sensitivity of soil respiration under four plant communities along an elevation gradient were studied, with their relations to the main environmental factors analyzed. The results showed that the soil respiration under the four plant communities had the same seasonal pattern, with the maximum (3.10-6.57 μmol CO₂·m^-2·s^-1) occurred in summer and the minimum (0.27-1.15 μmol CO₂·m^-2·s^-1) in winter. Soil respiration rate had a significant exponential correlation with soil temperature, but its correlations with soil moisture and litter input differed with plant communities. The Q₁₀ value of soil respiration was higher at high elevation than at low elevation. In mid-subtropical regions, the seasonal variation of soil respiration at different elevations was mainly controlled by soil temperature, indicating that in the case of global warming in the future, soils at higher elevation might release more CO₂ to the atmosphere.