检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:项存悌[1] 孙海峰[1] 邵忠文[1] 张景华 吴兴印 陈静林 邹喜文
机构地区:[1]东北林业大学 [2]黑龙江省阿城市森林病虫防治检疫站
出 处:《东北林业大学学报》1991年第3期1-6,共6页Journal of Northeast Forestry University
摘 要:在中国黑龙江省杨树细菌溃疡病严重发生地区,采用野外均匀分布典型整群抽样调查和树干解析方法,获得40块样地、90株解析木的病情调查材料。从而,确定了杨树细菌溃疡病各病情指数的材积损失率的相关数律,建立黑龙江省杨树细菌溃疡病对材积损失率的估测模型和防治指标的计算模型。The control index of bacterial canker of poplar has been studied in this research. The study was carried out in the area where poplar canker occurred seriously. By the method of typical population sampling and stem analysis in field, a lot of pathologic information have been got from 40 sample plots and 90 stem analysis trees. The correlation rule between pathologic condition index and volume loss rate has been established. The evaluation model for volume loss caused by the bacterial canker of poplar in Heilongjiang province and the control index models have been obtained.
分 类 号:S763.721.1[农业科学—森林保护学]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.254