BIOMASS AND PRODUCTIVITY OF A TREE FERN ECOSYSTEM IN CHINA Factors of Carbon Sequestration’s Capacity of Chinese Fir by Households and Decision-Making Measures of Carbon Supply Biomass carbon density and carbon sequestration capacity in seven typical forest types of the Xiaoxing’an Mountains, China Carbon budget of alpine Potentilla fruticosa shrubland based on comprehensive techniques of static chamber and biomass harvesting CARBON STOCK AND ITS ALLOCATION IN FIVE FOREST ECOSYSTEMS IN THE SUBALPINE CONIFEROUS FOREST ZONE OF WESTERN SICHUAN PROVINCE, SOUTHWEST CHINA