The paper analyzed the information from on-the-spot investigation by ecology methods such as importance value, species diversity index and similarity index,and discussed the characteristics of the structure, the diver...The paper analyzed the information from on-the-spot investigation by ecology methods such as importance value, species diversity index and similarity index,and discussed the characteristics of the structure, the diversity and similarity of plant community in Kerqin sandy land. It will provide scientific basis for exploring and utilizing the sandy land.展开更多
天津市某大型肉鸡场年饲养 AA 肉仔鸡约300万只,每批鸡均进行鸡新城疫、传染性法氏囊病、传染性支气管炎的免疫接种。鸡新城疫的免疫程序是,4~7日龄用 Clone30弱毒疫苗首免(滴鼻),10天后再用 Clone30加强免疫,有时10天后还进行三免。1...天津市某大型肉鸡场年饲养 AA 肉仔鸡约300万只,每批鸡均进行鸡新城疫、传染性法氏囊病、传染性支气管炎的免疫接种。鸡新城疫的免疫程序是,4~7日龄用 Clone30弱毒疫苗首免(滴鼻),10天后再用 Clone30加强免疫,有时10天后还进行三免。1996年初。展开更多
文摘The paper analyzed the information from on-the-spot investigation by ecology methods such as importance value, species diversity index and similarity index,and discussed the characteristics of the structure, the diversity and similarity of plant community in Kerqin sandy land. It will provide scientific basis for exploring and utilizing the sandy land.