An Evaluation on the Basis of Resource and Environment for Developing Bio-energy in Tibet
西藏生物质能开发的资源、环境基础分析

Developing bio-energy is a rational choice for solving problems of energy shortage and environmental pollution.As bio-energy is contained in biomass,and biomass has close relationship with characteristics of physiography,the suitability of developing bio-energy in a certain region must be evaluated according to its regional speciality.Based on the previous researches on solar energy,biomass,net primary productivity(NPP) of Tibet,accounting about the conversion process from solar energy to bio-energy and bio-energy sustainable utilization,the concept of usable productivity is presented.In order to keep biome community succession in sequence and restore endangered biome community,human being should not use up NPP.Under the condition of the stability and safety of biome community,part of NPP that human being can utilize is called Usable Productivity.Usable productivity can be used as biomaterial and bio-energy resource.With the help of these concepts,the quantity of bio-energy resource of Tibet is estimated.After analyzed the resource and environment of Tibet,the author finds out that the gross bio-energy resources is huge(24 million tce p.a.)for Tibet's expansion,while the average productivity of bio-energy resources is small(0.2tce per ha.in a year)in Tibet;that the environment is fragile,and the relationship between bio-energy utilization and environment is strain.Accordingly,the strategy of finite utilization according to different geographical characteristics is put forward.The core of the strategy is to balance the bio-energy exploiting and environmental protection,and the key of the strategy is to define the appropriate role of bio-energy in the whole energy consumption.Three measures are helpful to implement the strategy:1) to ascertain the useable productivity scientifically and control the quantity and intensity of biomass that is exploited and used;2)to prorate the quantity of biomaterial and bio-energy in the useable productivity;and 3) to suit measures in line with local conditions.