Modelling the vegetation of China using the process-based equilibrium terrestrial biosphere model BIOM3

摘要

We model the potential vegetation and annual net primary production (NPP) of China on a 10' grid under the present climate using the processed-based equilibrium terrestrial biosphere model BIOME3. The simulated distribution of the vegetation was in general in good agreement with the potential natural vegetation based on a numerical comparison between the two maps using the (#DELTA#V = 0.23). Predicted and measured NPP are also similar, especially in terms of biome-averages. A coupled-ocean-atmosphere general circulation model including sulphate aerosols was used to drive a double greenhouse gas scenario for 2070-2099. Simulated vegetation maps from two different CO_2 scenarios (340 and 500 p.p.m.v.) were compared to the baseline blome map using #DELTA#V, Climate change alone produced a large reduction in desert, a lpine tundra and ice/polar desert, and a general pole-ward shift of the boreal, temperate deciduous, warm-temperate evergreen and tropical forest belts, a decline in boreal deciduous forest and the appearance of tropical deciduous forest. The inclusion of CO_2 physiological effects led to a marked decrease in moist savannas and desert, a general decrease for grasslands and steppe, and disappearance of xeric woodland/scrub. Temperate deciduous broadleaved forest, however, shifted north to occupy nearly half the area of previously temperate mixed forest. The impact of climate change and increasing CO_2 is not only on biogeography, but also on potential NPP. The NPP values for most of the biomes in the scenarios with CO_2 set at 340 p.p.m.v. and 500 p.p.m.v. are greater than those under the current climate, except for the temperate deciduous forest, temperate evergreen broadleaved forest, tropical tain forest, tropical seasinal forest, and xeric woodland/scrub biomes. Total vegetation and total carbon is simulated to increase significantly in the future climate scenario, both with and without the CO_2 direct physiological effect. Our results show that the global process-based equilibrium terrestrial biosphere model BIOME3 can be used successfully at a regional scale.