Aim To investigate the responses of different components of soil respiration to environmental factors at different timescales in a vineyard ecosystem. Methods The trenching method was used to separate total soil respiration ( TSR ) into autotrophic respiration ( AR ) and heterotrophic respiration ( HR ). Soil respiration rates were measured by an LI-8100 automated flux system. Results On the hourly scale, there were contrasting responses in TSR , HR and AR to soil temperature at 5 cm ( ST 5 ), with clockwise hysteresis loop responses of TSR and HR to ST 5 but a counterclockwise hysteresis loop between AR and ST 5 . The daily TSR didn’t exponentially response to ST 5 during the growing season. On the monthly scale, the relationship between TSR and ST 5 showed a counterclockwise hysteresis loop . Meanwhile, the diel respiration peak lagged the peak of gross primary productivity ( GPP ), but the monthly peak of TSR preceded the monthly peak of GPP . The daily TSR and the daily soil water content at 5 cm ( SWC 5 ) in different months showed a quadratic relationship, but there was an exponential correlation between the monthly TSR and the monthly SWC 5 . Conclusions The relationship between soil respiration and environmental factors derived for a specific timescale cannot be directly applied to other timescales.

中文翻译：

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灌溉绿洲农业生态系统中的土壤呼吸：将环境控制与每小时、每天和每月的植物活动联系起来

目的研究葡萄园生态系统中不同时间尺度土壤呼吸不同成分对环境因子的响应。方法采用挖沟法将土壤总呼吸(TSR)分为自养呼吸(AR)和异养呼吸(HR)。土壤呼吸速率由 LI-8100 自动通量系统测量。结果 在小时尺度上，TSR、HR 和 AR 对 5 cm (ST 5 ) 土壤温度的响应不同，TSR 和 HR 对 ST 5 的滞后环响应为顺时针，而 AR 和 ST 5 之间的滞后环为逆时针滞后环。在生长季节，每日 TSR 对 ST 5 没有呈指数响应。在月度尺度上，TSR 与 ST 5 之间的关系呈逆时针滞后回线。同时，日呼吸峰值滞后于总初级生产力（GPP）峰值，但TSR月峰值先于GPP月峰值。不同月份的日TSR与5 cm处的日土壤含水量(SWC 5 )呈二次关系，但月TSR与月SWC 5 呈指数相关。结论 特定时间尺度下土壤呼吸与环境因子之间的关系不能直接应用于其他时间尺度。