The Effects of Mesquite (Prosopis juliflora) on Soils and Plant Communities in the Deserted Rangelands of Bahrain

Table 1

Mean values and standard errors (n = 32) of soil chemical properties in the understory of P. juliflora trees and the uncanopied adjacent areas.

Depth (cm)	Area/soil properties	EC (mS/cm)	pH	N (%)	P (mg·L^−1)	K (mg·L^−1)	Na (mg·L^−1)	Ca (mg·L^−1)	Mg (mg·L^−1)	SOM (%)
0–5	Understory	2.43 (1.09)^AB	8.08 (0.06)^AB	0.24 (0.05)^A	805 (233)^A	190 (122)^A	63 (36.8)^A	345 (125)^A	77.6 (36.2)^ABC	1.47 (0.30)^A
	Uncanopied	1.77 (0.57)^AB	8.10 (0.03)^A	0.11 (0.01)^B	347 (42.2)^BC	59.5 (31.6)^A	89.1 (75.4)^A	303 (60.6)^A	35.8 (9.66)^BC	0.67 (0.07)^B
5–20	Understory	3.56 (0.89)^A	7.98 (0.07)^AB	0.18 (0.04)^A	511 (55.1)^B	182 (54.3)^A	107 (36)^A	572 (156)^A	96 (25)^AB	0.74 (0.11)^B
	Uncanopied	1.93 (0.44)^AB	8.02 (0.03)^AB	0.07 (0.01)^BC	209 (33.3)^C	55.5 (18.2)^A	73.9 (40)^A	382 (117)^A	38.7 (5.79)^BC	0.31 (0.07)^C
20–40	Understory	3.41 (0.63)^AB	7.9 (0.04)^B	0.10 (0.01)^BC	234 (40.3)^C	155 (31.1)^A	123 (39)^A	547 (126)^A	98.9 (22.5)^A	0.41 (0.07)^BC
	Uncanopied	1.44 (0.45)^B	8.10 (0.07)^A	0.05 (0.01)^BC	175 (27.8)^C	50.6 (8.06)^A	24.2 (14.1)^A	350 (169)^A	30.5 (3.81)^C	0.12 (0.02)^C
40–60	Understory	2.52 (0.77)^AB	8.03 (0.11)^AB	0.04 (0.004)^BC	137 (33.2)^C	121 (22.2)^A	104 (45.1)^A	395 (120)^A	84.7 (20.4)^ABC	0.12 (0.02)^C
	Uncanopied	2.75 (0.66)^AB	7.96 (0.06)^AB	0.04 (0.01)^C	147 (19.2)^C	69.1 (14.9)^A	98.4 (63.8)^A	585 (135)^A	62.7 (19.9)^ABC	0.21 (0.03)^C

levels not connected by the same letter are significantly different () according to Student’s t-test.