关键词: 若尔盖, 净初级生产力, 时空变化特征, 气候响应

Abstract: 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.

Key words: Zoige, net primary productivity (NPP), climate response, spatio-temporal variation characteristics