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Water quality changes seasonal variations in root respiration, xylem CO2, and sap pH in citrus orchards

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  • Paudel, Indira
  • Bar-Tal, Asher
  • Rotbart, Nativ
  • Ephrath, Jhonathan
  • Cohen, Shabtai

Abstract

Effects of treated wastewater (TWW) and fresh water (FW) on autotrophic belowground respiration and respiratory coefficients (Q10) in summer and winter were determined in a commercial citrus orchard. Efflux of CO2 from soil and the often-ignored CO2 transported in xylem sap were quantified; the latter derived from sap flux, CO2 concentration ([CO2]), pH, and temperature. Xylem [CO2] scaled with xylem sap flux, pH and temperature. TWW and summer increased xylem sap pH (by 12% and 19%), soil CO2 efflux (32% and 65%), and root respired CO2 (10–15% and 55%) in comparison to FW and winter, respectively. About twice as much CO2 from the below ground autotrophic portion of respiration moved in xylem sap as compared to that diffused from the roots into the soil, with seasonal variations of about ±10%. Maximum temperature-dependent respiratory coefficients (Q10) were 4.7 for autotrophic root respiration and 3.8 for bulk soil CO2 efflux, and values varied with water quality and season.

Suggested Citation

  • Paudel, Indira & Bar-Tal, Asher & Rotbart, Nativ & Ephrath, Jhonathan & Cohen, Shabtai, 2018. "Water quality changes seasonal variations in root respiration, xylem CO2, and sap pH in citrus orchards," Agricultural Water Management, Elsevier, vol. 197(C), pages 147-157.
    • Handle: RePEc:eee:agiwat:v:197:y:2018:i:c:p:147-157
    DOI: 10.1016/j.agwat.2017.11.007
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    Cited by:

    1. Ma, Shou-Chen & Zhang, Wei-Qiang & Duan, Ai-Wang & Wang, Tong-Chao, 2019. "Effects of controlling soil moisture regime based on root-sourced signal characteristics on yield formation and water use efficiency of winter wheat," Agricultural Water Management, Elsevier, vol. 221(C), pages 486-492.

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