Abstract: Based on field investigation,soil sampling and laboratory experiment,soil fertilities of main forest soils in a typical region of the Hanjiang River Basin were analyzed quantitatively using the grey relational analysis method,and sequencing based on comprehensive evaluation conducted.Results show that soil fertility varied significantly between the soils of the six types of forests surveyed,which followed an order of evergreen broad-leaved forest(0.920 16) > mixed conifer forest(theropencedrymion)(0.892 87) > shrubberies(0.813 07) > eucalyptus plantation(0.788 58) > Phyllostachys pubescens forest(0.759 85) > Pinus massoniana forest(0.742 96).The soils of the first two were obviously the most fertile of the six,and the last is the poorest,which demonstrates that soil fertility is not only related to soil physico-chemical properties,but also to accumulation and decomposition of the litters therein.

Key words: forest soil fertility, grey relation analysis, Hanjiang River Basin