A simulation study on CO2 assimilation and crop growth in agroforest ecosystems in the East China Plain

The agroforest ecosystems in the East China Plain were clarified into two types with 5 different community structures．The CO₂ assimilation capacity of crops in each agroforest system was simulated by the production ecological model SUCROS and that of trees was calculated on the basis of the investigated data of photosynthetic rate of tree leaves，the leaf area index of tree crown，the effective sun shine hours and the correspondent forest coverage in each agroforest ecosystem．As compared with the traditional monocuhure system，the CO₂ uptake capacity of the agroforest ecosystems raised significantly．In most cases，the yield of the spring crop(winter wheat)increased in the agroforest systems because of the favorable eco．environment while that of summer crop(corn)decreased in some agmforest types which are mainly for timber producing．