Publication Abstracts

Meza et al. 2018

Meza, F.J., C. Montes, F. Bravo-Martínez, P. Serrano-Ortiz, and A.S. Kowalski, 2018: Soil water content effects on net ecosystem CO2 exchange and actual evapotranspiration in a Mediterranean semiarid savanna of Central Chile. Sci. Rep., 8, no. 1, 8570, doi:10.1038/s41598-018-26934-z.

Biosphere-atmosphere water and carbon fluxes depend on ecosystem structure, and their magnitudes and seasonal behavior are driven by environmental and biological factors. We studied the seasonal behavior of net ecosystem CO2 exchange (NEE), Gross Primary Productivity (GPP), Ecosystem Respiration (RE), and actual evapotranspiration (ETa) obtained by eddy covariance measurements during two years in a Mediterranean Acacia savanna ecosystem (Acacia caven) in Central Chile. The annual carbon balance was -53 g C/m2 in 2011 and -111 g C/m2 in 2012, showing that the ecosystem acts as a net sink of CO2, notwithstanding water limitations on photosynthesis observed in this particularly dry period. Total annual ETa was of 128 mm in 2011 and 139 mm in 2012. Both NEE and ETa exhibited strong seasonality with peak values recorded in the winter season (July to September), as a result of ecosystem phenology, soil water content and rainfall occurrence. Consequently, the maximum carbon assimilation rate occurred in wintertime. Results show that soil water content is a major driver of GPP and RE, defining their seasonal patterns and the annual carbon assimilation capacity of the ecosystem, and also modulating the effect that solar radiation and air temperature have on NEE components at shorter time scales.

Export citation: [ BibTeX ] [ RIS ]

BibTeX Citation

@article{me07200b,
  author={Meza, F. J. and Montes, C. and Bravo-Martínez, F. and Serrano-Ortiz, P. and Kowalski, A. S.},
  title={Soil water content effects on net ecosystem CO2 exchange and actual evapotranspiration in a Mediterranean semiarid savanna of Central Chile},
  year={2018},
  journal={Scientific Reports},
  volume={8},
  number={1},
  pages={8570},
  doi={10.1038/s41598-018-26934-z},
}

[ Close ]

RIS Citation

TY  - JOUR
ID  - me07200b
AU  - Meza, F. J.
AU  - Montes, C.
AU  - Bravo-Martínez, F.
AU  - Serrano-Ortiz, P.
AU  - Kowalski, A. S.
PY  - 2018
TI  - Soil water content effects on net ecosystem CO2 exchange and actual evapotranspiration in a Mediterranean semiarid savanna of Central Chile
JA  - Sci. Rep.
JO  - Scientific Reports
VL  - 8
IS  - 1
SP  - 8570
DO  - 10.1038/s41598-018-26934-z
ER  -

[ Close ]

• Return to 2018 Publications

• Return to Publications Homepage