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:邹华南
机构地区:[1]福建省华安县森林病虫害防治检疫站,福建华安363800
出 处:《青海农林科技》2016年第3期29-31,共3页Science and Technology of Qinghai Agriculture and Forestry
摘 要:为了提高对油桐尺蠖预测预报准确性,应用聚集度指标法、Iwao法和Taylor法等对油桐尺蠖幼虫的空间分布型进行测定检验,结果表明油桐尺蠖幼虫呈聚集分布,其聚集强度是随着种群密度升高而增加。应用Iwao抽样通式建立理论抽样数模型,由此确定了一套油桐尺蠖幼虫在不同密度下的理论抽样数表,并在此基础上提出了最佳理论抽样数和序贯抽样模型。The spatial distribution pattern of Buasra suppressaria Guenee in Eucalyptus forest were studied. The testing method included the aggregated indices method,Iwao method,and Taylor power law method.All of three methods shown that the distribution pattern of B. suppressaria is the assemble distribution type. Moreover,the assemble distribution index increased along with the increasing of their population density. Based on the distribution pattern,we proposed the best sampling method,the best theoretical sampling method,and sequential sampling model.
分 类 号:S763.3[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:216.73.216.62