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为了解林窗对川西亚高山粗枝云杉(Picea asperata)人工林土壤呼吸的影响,采用CO2通量全自动监测系统对川西亚高山粗枝云杉人工林林窗和林内土壤呼吸及土壤温度、水分进行为期两年的连续观测,比较分析林窗和林内环境因子和土壤呼吸速率的变化.结果表明:川西亚高山粗枝云杉人工林林窗和林内的土壤温度、土壤水分和土壤呼吸速率均具有显著的季节动态.在生长季节(4-10月),林窗效应使土壤温度、土壤水分和土壤呼吸速率较林内分别增加了48.8%、19.3%和18.6%;而冬季(11月-翌年3月)两种环境之间并无显著差异.林窗和林内土壤呼吸速率和土壤温度均呈显著指数相关(P<0.01),与土壤水分呈显著线性相关(P<0.05).林窗和林内的土壤呼吸温度敏感性(Q_(10))分别为2.46和3.01.综上所述,林窗效应对川西亚高山森林土壤呼吸具有显著刺激作用,且有明显的季节动态特征.(图3表1参33)
In order to understand the effects of gap opening on the soil respiration of Picea asperata plantations in sub-alpine region of western Sichuan, the CO2 flux automatic monitoring system was used to measure soil respiration and soil temperature , And the water was continuously observed for two years, and the changes of environmental factors and soil respiration rate were compared and analyzed.The results showed that soil temperature, soil moisture and soil respiration in the gaps and gaps of spruce plantations The rates of soil temperature, soil moisture and soil respiration increased by 48.8%, 19.3% and 18.6% respectively in the growing season (April-October), while in winter (November - March next year) There was no significant difference between the two environments. Soil respiration rate and soil temperature were significantly and exponentially correlated (P <0.01), and significantly correlated with soil moisture (P <0.05). The soil respiration temperature sensitivity (Q_ (10)) in windows and forest was 2.46 and 3.01, respectively. In conclusion, the Gap effect significantly stimulated soil respiration in the subalpine forest of western Sichuan and had obvious seasonal dynamics. Figure 3 Table 1 Reference 33 )