To understand soil carbon and nutrient pool and variation patterns under evergreen broad-leaved forest in northwest Sichuan

we chose mature forest of Cyclobalanopsis glauca Castanopsis fargesii Elaeocarpus japonicus

secondary and mature forest of Machillus pingii Alnus cremastogyne Phoeba bournei

secondary and young forest of Lithocarpus hancei Betula luminifera Eurya nitida to represent the typical evergreen broad-leaved forest types of this area.After examining soil carbon and nutrients pools

we obtained the following results and conclusions: By reasons of the differences of forest origin and ripening stage and the characteristics of plants

there was a big difference among soil carbon pools of this three inartificial forest types.Their soil carbon pools were 160.35 t/hm2

138.96 t/hm2

62.14 t/hm2 respectively and the mean was 120.48 t/hm2.The soil nutrients pools had different representations among the three forest types;However all of them were significantly impacted by forest types and their characters.There were trends of soil carbon and nutrients decreased with soil depth.The soil carbon and total nitrogen had evident representation.