RELATIONSHIP BETWEEN THE FUEL VALUE OF PLANTS AND DEVELOPING THE FAST-GROWING AND HIGH YIELDING FOREST FOR FIREWOOD The factors influencing rural household firewood consumption: a theoretical model and empirical research of a typical area in Chongqing Municipality The impact of firewood collection by local people on the distributing of arbors around the nature reserves: A case study in Wanglang Nature Reserve for Giant Panda(Sichuan)