Effect of grazing intensity on evapotranspiration in the semiarid grasslands of Inner Mongolia, China

Wang, Linsong; Liu, H.; Ketzer, Bettina; Horn, Rainer; Bernhofer, Christian

doi:10.1016/j.jaridenv.2012.04.005

Cited by 37 publications

(33 citation statements)

References 36 publications

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“…less negative Ψ leaf values under grazing conditions). It has been suggested that the intraspecific reduction of the plant transpirational surface in response to grazing may reduce water consumption and enhance soil moisture in grazed sites, improving the water status of those plants (Svejcar & Christiansen 1987;Bremer et al 2001;Wang et al 2012). Whilst some of our selected species increased mean Ψ leaf in response to grazing in agreement with this general trend, B. tucumanensis showed a decrease of Ψ leaf and other species did not respond to grazing, as previously found in other studies (Nowak & Caldwell 1984;Pittermann et al 2014).…”

Section: Discussionsupporting

confidence: 89%

Does grazing induce intraspecific trait variation in plants from a sub-humid mountain ecosystem?

et al. 2016

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Livestock grazing represents an important human disturbance for vegetation worldwide. We analysed the intraspecific differences in mean trait values between different grazing regimes (ungrazed and grazed) and explored whether these differences are consistent across species in a sub-humid mountain ecosystem in Central Argentina. We selected 14 species of eight different families, co-occurring in both regimes and comprising herbaceous (grasses and forbs) and woody (shrubs and trees) plants. For each species and grazing regime we measured 12 traits related to plant size, carbon fixation and water use. We found that plants in the grazed regime had consistently smaller leaves and shorter stature and internodal length than plants of the same species under the ungrazed regime. For the remaining traits the responses were species-specific. Dry matter content, leaf tensile strength and minimum leaf water potential (Ψ leaf ) showed contrasting responses to grazing. Specific leaf area, wood density and potential water content of wood showed almost no significant responses except for very few species. Neither leaf area per shoot mass nor leaf area per sapwood area differed significantly between grazing regimes. Our study suggested that the intraspecific variation found for the size-related traits would allow species to respond to grazing without modifying markedly other structural traits, a plastic response that might increase the probability of species success.

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Section: Discussionsupporting

confidence: 89%

Does grazing induce intraspecific trait variation in plants from a sub-humid mountain ecosystem?

et al. 2016

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“…When SWC decreased below 0.13 m 3 m −3 , LE/LE eq dropped precipitously and LE was limited by the low SWC. A similar phenomenon was also observed for this steppe, but with a threshold of SWC of 0.12 m 3 m −3 (Wang et al, ). Uneven precipitation distribution often caused soil water stress during the growing season in this area.…”

Section: Resultssupporting

confidence: 82%

“…In the normal precipitation year (2006), the response of T to SWC shows that daily T was significantly higher at UG79 than the grazed sites with similar SWC (Figure (b)), because of the LAI reduction by grazing (Figure (b)). As SWC was always higher at UG79 (Wang et al, ), it was reasonable that WG and HG reduced daily T throughout the 2006 growing season. On a seasonal scale, T was largely reduced by 30 to 55% (Table ).…”

Section: Resultsmentioning

confidence: 87%

Grazing intensity effects on the partitioning of evapotranspiration in the semiarid typical steppe ecosystems in Inner Mongolia

Wang

Liu

Bernhofer

2016

Intl Journal of Climatology

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Grazing intensity effects on the evapotranspiration (ET) partitioning into evaporation (E) and transpiration (T) were investigated using eddy covariance measurement data during the growing season ( (2006), WG and HG reduced T/ET because they significantly reduced T through the removal of leaf area. In the dry year (2005), this negative effect on T was depressed by summer droughts, while WG and HG decreased E primarily due to the decreased interception of rainfall by the canopy. The grazing effect on T/ET was opposite to that in 2006. These results indicate that grazing effects on ET partitioning could vary with soil water conditions in the semiarid typical steppe ecosystems.

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“…The significant control of SWC on ET/ET eq occurred only when SWC was under a threshold. The phenomenon was also observed in semiarid grasslands (Hunt et al 2002;Baldocchi et al 2004;Wang et al 2012). On the longer time scale, the mean ET/ET eq for the wet season (ET/ET eq =0.88), the dry season (ET/ET eq =0.55), and the whole year (ET/ET eq = 0.70) remained stable from 2011 to 2013.…”

Section: Et and Et/et Eqmentioning

confidence: 59%

Water and carbon dioxide fluxes over an alpine meadow in southwest China and the impact of a spring drought event

et al. 2015

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Based on the eddy covariance measurements from June 2011 to December 2013, the seasonal variations and the controls of water and CO2 fluxes were investigated over an alpine meadow in Lijiang, southwest China. The year 2012 had the largest total precipitation among years from 2011 to 2013 (1037.9, 1190.4, and 1066.1 mm, respectively). A spring drought event occurred from March to May 2012, and the peak normalized difference vegetation index (NDVI) in 2012 was the lowest. Throughout the whole year, net radiation (Rn), vapor pressure deficit, and air temperature (Ta) were the primary controls on evapotranspiration (ET), and R n is the most important factor. The influence of R n on ET was much more in the wet season (R(2) = 0.93) than in the dry season (R(2) = 0.28). In the wet season, the ratio of ET to equilibrium ET (ETeq) (0.92 ± 0.14; mean ± S.D.) did not show a clear seasonal pattern with NDVI when the soil water content (SWC) was usually more than 0.25 m(3) m(-3), indicating that ET could be predicted well by ETeq (or radiation and temperature). On half-hourly and daily scales, photosynthetic active radiation (PAR) and air temperature were the main meteorological factors in determining the net ecosystem production (NEP). The seasonal trends of NEP were closely related with the change of NDVI. The integrated NEP in the 2012 wet season (157.8 g C m(-2) year(-1)) was 19.5 and 23.8 % lower than in the 2011 and 2013 wet season (207.0 and 196.1 g C m(-2) year(-1)). The mean ET/ETeq for each of the wet seasons from 2011 to 2013 was 0.88. The 2012 spring drought and its reduction in NDVI decreased the total NEP significantly but had little effect on the total ET in the wet season. The different response of NEP and ET to the spring drought was attributed to the high SWC and small vapor pressure deficit during the wet season.

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Effect of grazing intensity on evapotranspiration in the semiarid grasslands of Inner Mongolia, China

Cited by 37 publications

References 36 publications

Does grazing induce intraspecific trait variation in plants from a sub-humid mountain ecosystem?

Does grazing induce intraspecific trait variation in plants from a sub-humid mountain ecosystem?

Grazing intensity effects on the partitioning of evapotranspiration in the semiarid typical steppe ecosystems in Inner Mongolia

Water and carbon dioxide fluxes over an alpine meadow in southwest China and the impact of a spring drought event

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