Table 2. The scaling relationship between population density, N, and body mass, M, and the ratio of the allometric exponent δ to β for trees, desert shrubs and herbaceous plants.

Plant type	n	Slope, δ±SE	IT	95% CI	r 2	δ/β
Trees/Forest
Boreal/temperate Larix forest	48	−0.81±0.040	3.20	−0.88, −0.74	0.887	−0.84
Boreal/alpine Picea abies forest	168	−0.671±0.023	2.50	−0.72, −0.61	0.802	−1.10
Boreal Pinus sylvestris var. mongolica forest	10	−0.70±0.055	2.51	−0.76, −0.51	0.952	−1.08
Temperate Pinus tabulaeformis forest	154	−0.81±0.037	2.88	−0.90, −0.71	0.691	−0.93
Temperate mixed coniferous-broadleaved forest	22	−0.64±0.027	2.30	−0.67, −0.60	0.964	−1.13
Temperate typical deciduous broadleaved forest	165	−0.88±0.033	3.34	−0.97, −0.81	0.773	−0.83
Temperate/subtropical montane Populus-Betula deciduous forest	127	−0.89±0.042	3.50	−0.97, −1.82	0.729	−0.90
Desert riverside woodland	9	−1.13±0.15	4.42	−1.44, −1.02	0.877	−1.37
Subtropical mixed evergreen-deciduous broadleaved forest	22	−0.66±0.08	2.48	−0.90, −0.47	0.700	−0.74
Subtropical evergreen broadleaved forest	238	−0.72±0.022	2.85	−0.78, −0.68	0.781	−0.77
Sclerophyllous evergreen Quercus forest	9	−1.15±0.15	5.21	−1.21, −0.89	0.879	−1.32
Tropical rainforest and monsoon forest	13	−0.76±0.12	3.09	−1.16, −0.64	0.737	−0.79
Subtropical montane Pinus yunnanensis and P. khasya forest	46	−0.85±0.033	3.31	−0.91, −0.77	0.933	−0.90
Subtropical Pinus massoniana forest	66	−0.73±0.051	2.74	−0.84, −0.63	0.685	−0.79
Subtropical montane Pinus armandii, P. taiwanensis and P. densada	55	−0.71±0.038	2.59	−0.79, −0.66	0.844	−0.92
Subtropical Cunninghamia lanceolata forest	98	−0.52±0.047	1.78	−0.64, −0.44	0.211	−0.64
Subtropical montane Cupressus and Sabina forest	16	−0.66±0.091	2.40	−0.84, −0.55	0.731	−1.19
Shrubs
Desert shrubs	239	−0.87±0.019	2.10	−0.90, −0.83	0.882	−0.94
Herbages
Spring wheat 2002	15	−0.75±0.10	2.94	−1.08, −0.61	0.752	−1.23
Spring wheat 2003	10	−0.61±0.14	3.17	−0.73, −0.55	0.598	−1.31
Spring wheat 2004	23	−0.66±0.037	3.20	−0.73, −0.62	0.936	−1.03
Mean value of β/δ ±SE					−0.99±0.21

SE is the standard error, and CI is the confidence interval of the slope.