10.5061/DRYAD.FK2RM
Shao, Changliang
Michigan State University
Chen, Jiquan
Michigan State University
Li, Linghao
Shanxi University
Dong, Gang
Shanxi University
Han, Juanjuan
Michigan State University
Abraha, Michael
Michigan State University
John, Ranjeet
Michigan State University
Data from: Grazing effects on surface energy fluxes in a desert steppe on
the Mongolian Plateau
Dryad
dataset
2016
National Science Foundation
https://ror.org/021nxhr62
1313761
2016-09-26T13:15:31Z
2016-09-26T13:15:31Z
en
https://doi.org/10.1002/eap.1459
546035 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Quantifying the surface energy fluxes of grazed and ungrazed steppes is
essential to understand the roles of grasslands in local and global
climate and in land use change. We used paired eddy-covariance towers to
investigate the effects of grazing on energy balance (EB) components: net
radiation (Rn), latent heat (LE), sensible heat (H), and soil heat (G)
fluxes on adjacent grazed and ungrazed areas in a desert steppe of the
Mongolian Plateau for a two-year period (2010-2012). Near 95% of Rn was
partitioned as LE and H, whereas the contributions of G and other
components of the EB were 5% at an annual scale. H dominated the energy
partitioning and shared ~50% of Rn. When comparing the grazed and the
ungrazed desert steppe, there was remarkably lower Rn and a lower H, but
higher G at the grazed site than at the ungrazed site. Both reduced
available energy (Rn˗G) and H through grazing indicated a “cooling effect”
feedback onto the local climate. Grazing reduced the dry year LE but
enhanced the wet year LE. Energy partitioning of LE/Rn was positively
correlated with the canopy conductivity, leaf area index, and soil
moisture. H/Rn was positively correlated with the vapor pressure deficit
but negatively correlated with the soil moisture. Boosted regression tree
results showed that LE/Rn was dominated by soil moisture in both years and
at both sites, while grazing shifted the H/Rn domination from temperature
to soil moisture in the wet year. Grazing not only caused a LE shift
between the dry and the wet year, but also triggered a decrease in the
H/Rn because of changes in vegetation and soil properties, indicating that
the ungrazed area had a greater resistance while the grazed area had a
greater sensitivity of EB components to the changing climate.
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