Fig 1.
Variation of annual average air temperature and precipitation during the growing season from 1963–2015 in Damxung County meterological station.
Fig 2.
Effects of experimental warming on soil temperature (Ts), soil moisture (SM), air temperature (Ta), and vapor pressure deficit (VPD) at elevation 4313 m, 4513 m, and 4693 m in 2014 and 2015 in an alpine meadow of the Northern Tibet.
Error bars represent standard errors (n = 4).
Fig 3.
Effects of experimental warming on normalized difference vegetation index (NDVI), green NDVI (GNDVI), and soil adjusted vegetation index (SAVI) at elevation 4313 m, 4513 m, and 4693 m in 2014 and 2015 in an alpine meadow of the Northern Tibet.
Error bars represent standard errors (n = 4).
Fig 4.
Effects of experimental warming on aboveground plant biomass (AGB, g m-2) and gross primary production (GPP, g C m-2 d-1) at elevation 4313 m, 4513 m, and 4693 m in 2014 and 2015 in an alpine meadow of the Northern Tibet.
Error bars represent standard errors (n = 4).
Fig 5.
Relationships of average normalized difference vegtation index (NDVI), green normalized difference vegtation index (GNDVI), soil adjusted vegetation index (SAVI), aboveground plant biomass (AGB, g m-2), gross primary production (GPP, g C m-2 d-1) with soil moisture (ΔSM, m3 m-3), vapor pressure deficit (VPD, kPa) and mean growing season precipitation (MGSP, mm) across elevation and warming treatment in an alpine meadow on the Tibetan Plateau.
MGSP data at the three elevations were obtained from Fu et al. [41].
Table 1.
Multiple stepwise linear regression analyses between normalized difference vegetation index (NDVI), green NDVI (GNDVI), soil adjusted vegetation index (SAVI), gross primary production (GPP), aboveground plant biomass (AGB) and soil temperature (Ts), air temperature (Ta), soil moisture (SM) and vapor pressure deficit (VPD), showing the regression coefficient, significance probability (p), and coefficient of determination (R2).