Contribucián del estrato arbustivo a los flujos de agua y CO2de un matorral subtropical en el Noroeste de México

Translated title of the contribution: Understory contribution to water vapor and CO2fluxes from a subtropical shrubland in northwestern Mexico

Martha L.Vargas Terminel, Enrico A. Yépez, Tonantzin Tarin, Carlos A.Robles Zazueta, Jaime Garatuza Payán, Julio C. Rodríguez, Christopher J. Watts, Enrique R. Vivoni

Research output: Contribution to journalArticlepeer-review

Abstract

The net ecosystem production and evapotranspiration (ET) of arid and subtropical ecosystems is poorly understood by the lack of measurements of CO2and water vapor fluxes. Moreover, the contributions related to the fluxes in the different strata (i.e. understory) have been poorly studied. The present investigation estimates ET and CO2fluxes of a shrubby understory with the presence of Mimosa distachya from a subtropical shrubland in relation to the net estimates of ecosystem ET and net CO2fluxes determined with the eddy covariance technique. Instantaneous ET and CO2exchange measurements were carried in four plots for different time periods during the day (9, 11, 14 and 18 hours) using a static chamber (16.4 m3) coupled with a fast response infrared gas analyzer. The variation of the fluxes during diurnal cycles was used to integrate the magnitude of the flux during the daylight hours. There was great variation in the understory fluxes, during July and September where there was more CO2gain from the atmosphere towards the ecosystem with a net CO2exchange of -1.35 ± 1.93 g C m-2d-1and -1.15 ± 0.74 g C m-2d-1, respectively, indicating that photosynthesis was higher than respiration in this stratum. In a dry period during August the CO2flux was -0.85 ± 0.73 g C m-2d-1. During these periods ET was 3.63 ± 0.15 mm d-1in July, 2.71 ± 0.08 mm d-1in August and 1.59 ± 0.5 mm d-1in September. Comparing these results with the total ecosystem ET and the net CO2exchange, it was found that the understory contributes with 17 and 21% to CO2fluxes and from 25 to 39% in water vapor fluxes during the North American Monsoon.

Translated title of the contributionUnderstory contribution to water vapor and CO2fluxes from a subtropical shrubland in northwestern Mexico
Original languageSpanish
Pages (from-to)98-135
Number of pages38
JournalTecnologia y Ciencias del Agua
Volume11
Issue number5
DOIs
StatePublished - 2020

Keywords

  • Biogeosciences
  • Ecohydrology
  • Evapotranspiration
  • Mimosa distachya
  • Net COexchange
  • Understory

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology

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