... multi-peak. The highest annual Ca and Mg returns were noticed in the FH and in the CK, respectively. The amounts of N, P, and K which potentially returned to the soil were the highest in the NF. The ... range of subtropical broadleaved forests, exceptthat of K in the CK [9, 23, 44, 52]. Compared with the CK, the OX had much lower return of K and Mg. The CF had potentialinput of N and P close to ... in the CF and the two other Chinese fir plantations in Tianlin and Huitong, whilethose of P seems very similar [21, 39]. The CF and FH poten-tially returned much more Ca, and less N and P, to...