A Comprehensive Study on the Plant and Animal Complementary Ecosystem ( I )——Dynamic Simulation of CO₂ Concentration and Decision of the Proportion of Vegetable and Livestock

In present plant and animal complementary ecosystem, the ratio of plant growing area to animal raising area varies greatly that causes CO₂ concentration too high or too low, and the effect of CO₂ enrichment is reduced. Under the condition that a CO₂ transfering installation is equiped and the CO₂ distrbution along the greenhouse is even, a mathematic equilibrium model of CO₂ transfer is established and a computer program for dynamic simulation of CO₂ concentration is developed and verified. Based on the appropriate greenhouse CO₂ concentration and taking a tomato and fattening pig complementary ecosystem in Shenyang district as an example, the suitable proportion of tomato growing area to the number of fattening pigs is calculated, which supply a basis for the construction and administration of the ecosystem.