The Characteristics of Farmland Terra Nera Ecosystem
农田黑土生态系统特征

In this paper the circulation of water and nutrient in the typical terra nera farmland in Hailun city,Heilongjiang Province is studied.The specific chemical and physical properties as well as the eco-system characteristics of the terra nera are descriped.In a further step the productivity of this kind of soil is estimated in order to rationally utilization the terr nera resource.