Soil water regulates the control of photosynthesis on diel hysteresis between soil respiration and temperature

Causes for diel hysteresis between soil respiration ( R s ) and temperature remain highly controversial. Explanations for the occurrence of hysteresis have involved both biological and physical mechanisms. The specifics of these explanations, however, tend to vary with the particular ecosystem or biome being studied. This study examined the seasonal variation in diel hysteresis and its controlling factors in a desert-shrub ecosystem in northwest (NW) China. The study was based on continuous measurements of R s , air temperature ( T a ), soil temperature at the surface and below ( T surf and T s ), volumetric soil water content ( SWC ), and photosynthesis over a year 2013. Trends in diel R s were observed to vary with SWC over the growing season. Diel variations in R s were more closely associated with T surf than with photosynthesis as SWC increased, leading to R s being in phase with T surf , particularly when SWC > 0.08 m 3  m −3 . However, as SWC decreased below 0.08 m 3  m −3 , diel variations in R s were more closely related to variations in photosynthesis, leading to a pronounced diel hysteresis and asynchronicity between R s and T surf . It was indicated that SWC regulates the relative control between photosynthesis and temperature on diel R s by changing the relative contribution of autotrophic and heterotrophic respiration to total R s , and thus, causing seasonal variation in diel hysteresis between R s and temperature. Our findings highlight the importance of biologically-based mechanisms and the role of SWC in regulating diel hysteresis between R s and temperature.

• Publication year

  2016

• Venue

  Biogeosciences Discussions

• Publication date

  2016-10-24

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.5194/BG-2016-438
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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