Table 4 Environmental variables used to predict the potential geographic distribution of F. unibracteata.

From: Effects of climate warming and human activities on the distribution patterns of Fritillaria unibracteata in eastern Qinghai-Tibetan Plateau

Code

Variable

Resolution

Unit

Bio2

Mean diurnal range

2.5’

°C

Bio3

Isothermality

2.5’

/

Bio6

Min temperature of coldest month

2.5’

°C

Bio7

Temperature annual range

2.5’

°C

Bio10

Mean temperature of warmest quarter

2.5’

°C

Bio12

Annual precipitation

2.5’

mm

Bio14

Precipitation of warmest quarter

2.5’

mm

El

Elevation

2.5’

m

Aspect

Aspect

2.5’

°

PH

Potential of hydrogen

2.5’

/

T-C

Organic carbon pool topsoil

2.5’

%

T-sand

Topsoil sand fraction

2.5’

%

Depth

Reference soil depth

2.5’

m

UV-B3

Mean UV-B of Highest Month

2.5’

kJ/m2

Hf

Human footprint index

2.5’

/