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
出 处:《四川草原》2005年第3期60-62,共3页Journal of Sichuan Grassland
摘 要:尖扎县草地害鼠约6种,常见的为高原鼠兔、中华鼢鼠两种,危害面积达3.2×104hm2,占总面积的18.7%。害虫主要有宽须蚁蝗、小翅雏蝗、狭翅雏蝗。由于鼠虫的挖掘和啃食,致使优良牧草减少、水土流失加剧,形成了大面积的次生裸地和寸草不生的“黑土滩”,从“七五”开始,全县累计灭治鼠虫害1.44×105hm2,挽回牧草损失达2.575×105kg,有效地控制了鼠虫害的危害和蔓延。There were more than 6 kinds of rodent species which were damaging the grassland in Jianzha,and among them the most commonly distributed species were pika(Ochotona curzoniae)and zokor(Myospalax fontanieri). The area of affected grassland reached to 3.2×104 hm2 million ha and it ac- counts for 18.7% of total grassland area of Jianzha. Myrmeotettix patpalis,Chorthippws fauax and Chor- hippus dubius were main pests in Jianzha. Stelleracha maejasmet,Achnatherum inebrians and Oxytropis ochrocephals Bunge were main poisonous grass. Weeds Degradtion of grassland,including“Black Soil Type”of grassland,was mainly caused by rodents and pests. Rodents and pests in 14.4×104 hm2 ha of grassland were controlled and 25.75×104 million kg of forage loss was avoided from 1980.
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:216.73.216.145