Table 2.

Evaluation results for 10 ecoregions for TNO₃ WDEP. The units for the means and MB are kg ha⁻¹, and kg ha⁻¹ yr⁻¹ for the trends. The bolded values indicate trends that are statistically significant with the P value less than 0.05 for the standard Student’s t test.

ID	Regions Name	#sites	Mean		MB	NMB	R	Trends
			Obs	Mod				Obs	Mod
5	Northern Forests	18	7.56	4.97	−2.59	−0.34	0.93	−0.22	−0.16
6	Northwestern Forested Mountains	28	3.23	1.28	−1.95	−0.60	0.70	−0.03	−0.01
7	Marine West Coast Forest	3	1.55	2.34	0.79	0.51	0.44	−0.02	0.01
8	Eastern Temperate Forests	72	8.77	6.14	−2.63	−0.30	0.97	−0.20	−0.17
9	Great Plains	24	4.73	2.62	−2.11	−0.45	0.87	−0.05	−0.04
10	North American Deserts	17	1.81	0.66	−1.15	−0.63	0.82	−0.02	−0.01
11	Mediterranean California	4	2.34	2.39	0.05	0.02	0.76	−0.09	−0.03
12	Southern Semi-arid Highlands	1	1.59	0.49	−1.11	−0.69	0.85	−0.02	−0.01
13	Temperate Sierras	2	2.49	0.80	−1.68	−0.68	0.61	−0.01	0.00
15	Tropical Wet Forests	1	5.80	2.07	−3.73	−0.64	0.88	0.11	0.04