Abstract: In recent years, seagrass ecosystem in China has been degraded seriously. Taking the seagrass bed ecosystem in Hepu of Guangxi Province as example, and employing the basic theories of eco-economics, its services value loss caused by human activities was primarily estimated based on the local statistic data from 1980 to 2005. The evaluation indices system included food production, atmosphere regulation, ecosystem nutrient circulation, water purification, biodiversity maintenance, and functions of scientific research. The results showed that the total services value loss of seagrass bed ecosystem in Hepu of Guangxi was 34 657.95×10⁴ Yuan RMB from 1980 to 2005, and the loss ratio reached 71.97%, in which, the direct use value increased 4452.88×10⁴ Yuan RMB, while the indirect use value loss was 39 110.83×10⁴ Yuan RMB, with the loss ratio accounted for 81.82% from 1980 to 2005, proving that the increasing trend of human exploitation intensity was evident.

Key words: Wheat, Grain quality, Protein components, Genotype, Environment