Abstract: Recently, the discussion on allometric model becomes a hotspot again, with the focus on the scaling exponent and theoretical explanation. This paper summarized the related researches on WBE 97, BMR（99）model, and introduced in especial the MGL model and its deduced results. From the deduction of MGL model, the metabolic rate of whole organism has no obvious dependence on the mass of the whole organism, and the scaling exponent of mass-specific metabolic rate common to most taxa is not a fix value but in \[2/3, 1\]. There exists the value of minimal mass-specific metabolic rate, which determines the maximum size the organism could attain. A theoretical model based on the minimal mass-specific metabolic rate was presented, which can describe the relationship between organism’s body size and temperature, and was proofed by empirical justification.

Key words: Land use change, Terrestrial ecosystem, Carbon storage, Deforestation, Reforestation, Tillage, Rotation, Fertilization