Plant-Soil Relationships of Bromus tectorum L.: Interactions among Labile Carbon Additions, Soil Invasion Status, and Fertilizer

Table 3

Influence of treatment, soil invasion status, and growth-cycle on B. tectorum growth and leaf N concentration.

	Aboveground mass		Root mass		Leaf N
Treatment	BNI	BI	BNI	BI	BNI	BI	soils pooled
	dry weight (mg)		dry weight (mg)		g/100 g
First growth-cycle
Control	10(0-38)	279(186-391)	11(−89-111)	282(182-382)	1.1	1.7	1.4(1.1-1.7)
Sucrose	4(1-26)	4(−1-25)	4(−96-104)	5(−95-105)	1.4	1.1	1.2(0.9-1.6)
Fert	69(22-116)	454(307-562)	95(−4-196)	308(208-408)	1.2	1.1	1.1(0.8-1.5)
Sucrose + Fert	5(−1-27)	19(1-59)	2(−98-102)	15(−94-125)	2.2	2.9	2.6(2.2-2.9)
Trts pooled					1.4(1.2-1.6)	1.7(1.4-1.9)
Second growth-cycle
Control	17(1-49)	224(137-319)	26(−73-126)	198(98-298)	1.9	1.4	1.7(1.3-2.0)
Sucrose	26(2-59)	178(99-259)	17(−82-118)	152(52-253)	1.6	2.0	1.8(1.4-2.2)
Fert	156(80-227)	228(115-334)	233(133-333)	194(71-317)	3.7	3.4	3.6(3.2-3.9)
Sucrose + Fert	734(564-893)	725(569-899)	458(358-558)	449(349-550)	3.0	2.9	2.9(2.6-3.3)
Trts pooled					2.6(2.3-2.8)	2.4(2.2-2.6)
Third growth-cycle
Control	156(89-243)	382(271-511)	126(26-226)	369(269-469)	2.1	1.5	1.8(1.4-2.1)
Sucrose	203(109-295)	217(136-318)	169(59-278)	198(98-299)	2.3	1.6	2.0(1.6-2.3)
Fert	394(71-511)	544(363-706)	274(174-374)	348(225-470)	3.0	2.9	2.9(2.6-3.3)
Sucrose + Fert	466(334-596)	744(552-964)	288(188-389)	466(345-590)	2.8	2.6	2.7(2.3-3.1)
Trts pooled					2.4(2.2-2.6)	2.1(1.8-2.3)
ANOVA results
Parameter	Trt	Soil	Cycle	Trt*cycle	Trt*soil	Soil*cycle	Trt*soil*cycle
Aboveground mass	<0.0001	<0.0001	<0.0001	<0.0001	<0.0004	0.0160	<0.0005
Root mass	<0.0001	<0.0001	<0.0001	<0.0001	0.0126	0.0880	0.0652
% Leaf N	<0.0001	0.3844	<0.0001	<0.0001	0.6765	0.0378	0.2846

BNI: noninvaded soil; BI: B. tectorum invaded soil; trt: treatment; Fert: fertilizer added. Sucrose added only at beginning of 1st growth-cycle. 95% confidence intervals in parentheses.