Spatial heterogeneity of urban soils: the case of the Beijing metropolitan region, China

Ecological Processes

Table 1 Descriptive statistics of soil properties in Beijing

Soil properties	Median	Minimum	Maximum	SE	CV (%)	Mean	Background value	K-SPvalue
pH	8.07	7.43	8.77	0.01	2.36	8.05	6.47^a	0.010
BD (mg/kg)	1.39	0.89	1.74	0.01	9.13	1.38	1.11^b	0.054
Moisture (%)	17.35	3.79	54.84	0.28	34.90	17.02	16.62^a	0.278
AP (mg/kg)	14.33	0.61	274.03	1.16	119.25	20.71	11.37^a	<0.001
AK (mg/kg)	158.13	41.20	711.10	4.16	50.54	176.44	281.8^a	<0.001
SOC (g/kg)	9.61	1.68	64.28	0.26	53.94	10.51	62.16^a	<0.001
TN (g/kg)	0.85	0.23	2.46	0.01	33.91	0.89	2.84^a	0.009
C/N	11.16	4.08	26.13	0.15	27.77	11.59	21.54^a	<0.001
Pb (mg/kg)	18.53	0.66	291.98	0.83	81.45	21.80	25.40^c	<0.001
Cr (mg/kg)	54.11	5.24	154.75	0.54	21.08	54.14	68.10^c	<0.001
Cu (mg/kg)	25.15	0.70	125.22	0.64	47.65	28.39	23.60^c	<0.001
Ni (mg/kg)	25.03	11.84	61.56	0.21	18.02	25.33	29.00^c	0.010
Mn (mg/kg)	672.10	338.21	1572.52	5.76	17.84	685.49	705.00^c	0.049

^aLiu et al. [2003], a study of soil properties in mountain region, Beijing; ^bSu et al. [2001], another study of soil properties in mountain region, Beijing; ^cChina National Environmental Monitoring Center [1990], a book of soil background value in China. SE-Standard errors; CV-Coefficient of variation.