Effect of nitrogen addition on soil CO2 efflux and fine root biomass in maple monocultures of the hyrcanian region

Table 3 ANOVA results on soil temperature, moisture, CO₂ efflux, and fine root biomass, based on repeated measurements (months, N addition, and their interaction during the study period)

Soil properties	Source	df^a	Mean square	F
Soil temperature	Month	11	276.9	1044.009^**
	Month × Nitrogen addition	33	0.534	2.014^**
	Nitrogen addition	3	8.194	0.272^ns
Soil moisture	Month	11	333.387	154.666^**
	Month × Nitrogen addition	33	2.937	1.362^ns
	Nitrogen addition	3	2.172	0.182^ns
Soil CO₂ efflux	Month	11	21920.442	648.249^**
	Month × Nitrogen addition	33	698.675	20.662^**
	Nitrogen addition	3	24097.282	429.214^**
Fine root biomass	Season	3	11.942	13.674^**
	Season × Nitrogen addition	9	0.694	0.794^ns
	Nitrogen addition	3	42.360	18.494^**

ISSN: 1297-966X