Effects　of　Chinese　Fir，Loblolly　Pine　and　Deciduous　Oak　Forests　on　Nutrient　States　of　Soils　in　Northern　Subtro－pics　of　China

摘要

ＥｆｆｅｃｔｓｏｆＣｈｉｎｅｓｅＦｉｒ，ＬｏｂｌｏｌｌｙＰｉｎｅａｎｄＤｅｃｉｄｕｏｕｓＯａｋＦｏｒｅｓｔｓｏｎＮｕｔｒｉｅｎｔＳｔａｔｅｓｏｆＳｏｉｌｓｉｎＮｏｒｔｈｅｒｎＳｕｂｔｒｏ－ｐｉｃｓｏｆＣｈｉｎａＬＵＯＲＵ－ＹＩＮＧａｎｄＧＡＯＺＨＩ－...