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Contrasting diel hysteresis between soil autotrophic and heterotrophic respiration in a desert ecosystem under different rainfall scenarios

机译：不同降雨情景下沙漠生态系统中土壤自养呼吸与异养呼吸的相对迪尔滞后

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摘要

Diel hysteresis occurs often between soil CO2 efflux (RS) and temperature, yet, little is known if diel hysteresis occurs in the two components of RS, i.e., autotrophic respiration (RA) and heterotrophic respiration (RH), and how diel hysteresis will respond to future rainfall change. We conducted a field experiment in a desert ecosystem in northern China simulating five different scenarios of future rain regimes. Diel variations of soil CO2 efflux and soil temperature were measured on Day 6 and Day 16 following the rain addition treatments each month during the growing season. We found contrasting responses in the diel hysteresis of RA and RH to soil temperature, with a clockwise hysteresis loop for RH but a counter-clockwise hysteresis loop for RA. Rain addition significantly increased the magnitude of diel hysteresis for both RH and RA on Day 6, but had no influence on either on Day 16 when soil moisture was much lower. These findings underline the different roles of biological (i.e. plant and microbial activities) and physical-chemical (e.g. heat transport and inorganic CO2 exchange) processes in regulating the diel hysteresis of RA and RH, which should be considered when estimating soil CO2 efflux in desert regions under future rainfall regime.
机译：Diel滞后现象经常发生在土壤CO2外排（RS）和温度之间，但人们对RS的两个成分即自养呼吸（RA）和异养呼吸（RH）中是否存在diel滞后现象知之甚少，而diel滞后将如何反应未来的降雨变化。我们在中国北方的沙漠生态系统中进行了野外实验，模拟了未来降雨状况的五种不同情况。在生长季节每个月加雨处理之后的第6天和第16天，测量土壤CO2外流和土壤温度的Diel变化。我们发现RA和RH的diel磁滞对土壤温度的响应不同，RH的顺时针磁滞回线，而RA的逆时针磁滞回线。在第6天，添加雨水会显着增加RH和RA的diel滞后幅度，但在第16天土壤湿度低得多时，两者均没有影响。这些发现强调了生物学（即植物和微生物活动）和物理化学（例如热传递和无机CO 2交换）过程在调节RA和RH的diel滞后方面的不同作用，在估算沙漠中的土壤CO 2流出量时应考虑这些因素未来降雨制度下的地区。

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