Abstract: The investigation on the aboveground biomass of rubber plantation in Xishuangbanna at low (550～600 m), medium (750～800 m), and high (950～1 050 m) elevations showed that the aboveground biomass and its dry weight were decreased with increasing elevation, and there was a significant difference at different elevations. The dry weight of the biomass was higher than 70%. The biomass of branch and leaf, which occupied 20% and 5% of the aboveground biomass, respectively, was the highest at medium elevation, and the lowest at high elevation. Temperature was possibly one of main factors affecting the biomass. The biomass of aboveground organs at the three elevations ranked in the order of stem > branch > leaf. Using the regression model of rubber plantation biomass at low elevation to calculate the biomass at medium and high elevations, and the mixed model to calculate the biomass at the three elevations would bring errors to a certain extent.

Key words: Suffolk sheep, Polled Dosert sheep, Ecological adaptability, Hybrid