Effect of 26 Years of Intensively Managed Carya cathayensis Stands on Soil Organic Carbon and Fertility

Table 3

Property statistics of the soils under in C. cathayensis forest stands sampled during a soil survey in 1984 (unpublished data, Lin’an Agricultural Bureau).

Soil properties	Grade 1	Grade 2	Grade 3	Grade 4
pH	<6.0	6.0–6.5	6.5–7.0	>7.0
%	5.6	50.0	33.3	11.1
SOC (g kg^−1)	<15.0	15.0–20.0	20.0–25.0	>25.0
%	38.9	38.9	11.1	11.1
Total N (g kg^−1)	<1.0	1.0–1.5	1.5–2.0	>2.0
%	16.7	11.1	27.8	44.4
Total P (g kg^−1)	<0.5	0.5–1.0	1.0–1.5	>1.5
%	66.7	11.1	16.7	5.6
Total K (g kg^−1)	<3.0	3.0–5.0	5.0–7.0	>7.0
%	5.6	33.3	55.6	5.6