河北坝上三种饲用树种的年生长模型与饲草产量研究

通过河北坝上地区三个常见树种两年的研究说明，三个树种的年生长符合Ｌｏｇｉｓｔｉｃ方程，其生物量显著高于当地天然草地产量，而且其营养价值也很高。三人树种以榆树表现最好，建议其成为坝上区首先考虑的饲料种之一。

The Annual Growth Model and Fodder Production of Three Tree Species in Bashang Prefecture of Hebei Province

Three tree species,Populus cathayna,Ulmus pumila and Salix purpurea,were examined in this study fortheir potential in fodder use.It is observed that the annual growth pattern of the species was consistent withthe Logistic Growth Medel and the fedder yield(with gtal nutritive value)from them was significantlyhigher than that from the native grasslands.The species of Ulmus pumila showed the highest potential for fod-der preduction among the three and,therefore,was suggested as a priority in options for increasing localfodder production.