The soil acidity and contents of several nutrients,organic matter,hydrolysable N,available P,K,exchangeable Ca,Mg,and their seasonal dynamic changes under 3 different forests, Pinus massoniana forest(PMF),pine and broadleaf mixed forest(PBMF),and monsoon evergreen broadleaf forest(MEBF) of Dinghushan Nature Reserve were investigated.Soil pH was ranked in the order PMF>PBMF>MEBF,and increased with soil depth and the seasonal changes.The reason for the above phenomena was probably soil microbes,which had a...