Table 1 Geographical, topographical, and structural characteristics of the sampled sites. The numbers 1 to 10 represent the site codes. DBH (cm) is diameter at breast height. Values shown are the means ± SE.

From: Responses of Intrinsic Water-use Efficiency and Tree Growth to Climate Change in Semi-Arid Areas of North China

Site code

Latitude (N)

Longitude (E)

Aspect

Elevation (m)

Slope (°)

DBH (cm)

Height (m)

1

40°28′

117°8′

NE

562

30

21.4 ± 3.7

18.5 ± 1.5

2

40°28′

117°7′

NE

537

16

20.9 ± 4.3

18 ± 1

3

40°27′

117°9′

NW

496

19

22.3 ± 4.6

20.5 ± 1.5

4

40°26′

117°10′

N

435

26

20.7 ± 2.9

17 ± 2

5

40°25′

117°8′

SE

508

27

21.6 ± 4.4

19.5 ± 1

6

40°26′

117°7′

SW

522

23

22.5 ± 3.4

20.5 ± 1

7

40°25′

117°7′

SE

369

25

23.4 ± 3

22.5 ± 1.5

8

40°24′

117°5′

SW

332

21

22.3 ± 4.5

21.5 ± 2

9

40°24′

117°6′

S

414

22

23.9 ± 3.7

22 ± 1.5

10

40°25′

117°4′

SE

420

20

21.2 ± 2.8

20.5 ± 1