Abstract: The structure and economic effect of lowland agroecosystem models in Dongguan suburbs of Guangdong Province are studied. The major models there include integrated planting-raising model, animal rearing model, and high-bed and low-ditch vegetable growing model. The results show that integrated planting-raising model has a perfect function and a high work day value. It is suggested that according to eco-engineering principles, such essential components as fish culture and pig farming should be added to the continuous vegetable growing model to improve the holistic function of the ecosystem and obtain a sustainble effect.

Key words: Lowland, Agroecosystem model, Integrated farming system, soil microbial community, forest restoration, Picea asperata plantation, phospholipid fatty acid