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

Table 4

Influence of treatment, soil invasion status, and growth-cycle on soil-solution nitrate and acetate.

		Nitrate			Acetate
	Treatment	BNI	BI		BNI	BI
		mmol L^-1× 100			𝜇mol L^-1
	First growth-cycle
	Control	3(0-16)	38(16-68)		9	9
	Sucrose	0(−4-5)	0(−4-4)		77	225
	Fert	5(0-20)	124(82-176)		2	10
	Sucrose + Fert	0(−3-6)	9(1-25)		242	140
	Second growth-cycle
	Control	15(1-46)	73(31-133)		5	19
	Sucrose	2(−2-20)	9(0-35)		57	134
	Fert	827(664-1007)	743(556-956)		13	4
	Sucrose + Fert	153(88-235)	289(197-399)		29	60
	Third growth-cycle
	Control	10(0-38)	56(20-110)		9	9
	Sucrose	10(0-38)	15(1-48)		25	17
	Fert	257(151-389)	515(387-662)		11	6
	Sucrose + Fert	362(256-487)	298(183-441)		9	14
		Acetate trt main effects		Control	8(5-12)
				Sucrose	99(62-154)
				Fert	8(5-14)
				Sucrose + Fert	110(71-169)
ANOVA results
Parameter	Trt	Soil	Cycle	Trt*cycle	Trt*soil	Soil*cycle	Trt*soil*cycle
Nitrate	<0.0001	<0.0001	<0.0001	<0.0001	0.0552	0.2246	0.0219
Acetate	<0.0001	0.8370	0.1495	0.1217	0.6309	0.4955	0.9501

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.