Logarithmic decreasing tendencies with soil depth were generally
observed in SOM, N (total N and extractable N), total P and
extractable K, and best-fittings showed logarithmic equation is
good for fitting the vertical decreases of each parameters
(R2 > 0.92) except extractable K distribution (R2 = 0.621). Increasing
tendencies with soil depth were found in K and extractable P
(Table 2). Stoichiometric ratios of K:P and K:extractable K markedly
increased, while the ratios of C:P, C:K, N:P,N:K and P:extractable
P were markedly decreased with soil depth (Table 2)