Biomass

Biography

Biography: WeiSheng Zeng

Abstract

Addressing climate change has become a concern issue worldwide in the 21st century and an important mission in Chinese forestry. Accompanying the implementation of the 8th National Forest Inventory during 2009-2013, a program of individual tree biomass modeling for major tree species in China was completed. Based on thematic studies, a scheme of population classification on modeling individual tree biomass equations was presented, including 34 tree species or species groups, 6 large scale geographic regions, and a total of 70 populations; and two technical regulations on procedures for collecting samples and methodology for biomass modeling were published as ministerial standards for application. During the five years, a total amount of 5860 sample trees for 38 modeling populations of 15 tree species were felled for aboveground biomass (including four components: stem wood, stem bark, branches and foliage) mensuration, and about 1/3 trees were also used for belowground biomass mensaration. In addtion, carbon accounting parameters, such as carbon factor and wood density, were also measured in laboratory. Up to now, the individual tree biomass models for 33 populations of 13 tree species have been developed using the approaches of dummy models, mixed models and error-in-variable simultaneous equations. The biomass models involve above- and below-ground biomass, and four component biomass. Aboveground biomass model is compatible to tree volume model and biomass conversion factor model and additive to four component biomass models, and belowground biomass model is compatible to root-shoot ratio model. The biomass models and carbon accounting parameters for five tree species were published as ministerial standards for application. The ministerial standards for other eight tree species (groups) would be published in 2016. The tree biomass models and carbon accounting parameters would lay the foundation for estimating carbon storage and evaluating carbon sequestration capacity of forest ecosystems in China.