【摘要】 甘肃省肃南县近年突发大沙鼠(Rhombomys opimus)危害草地。为了掌握大沙鼠危害状况及成因,本研究选择肃南县大沙鼠危害区域,采用了路线调查法和大沙鼠栖息地生境要素调查法。结果显示,大沙鼠在肃南部分山地荒漠化草原危害严重,有明显的爆发性特点。2008-2012年之间,洞群系数、单位面积洞口数和绝对鼠密度几乎从零分别猛增到0.33、3 994洞口/hm2和526只/hm2,使生草面积损失率达40%,造成牧草损失量1 239.15×104 kg。导致大沙鼠成灾的主要原因为干旱的气候、退化封育的草原、大沙鼠适宜的生存环境、小范围防治的局限性以及宽松的生存空间,使大沙鼠种群繁殖力提高、死亡率下降、数量激增,并快速蔓延。更多还原

【Abstract】 Recently,with the increasing number of gerbil,there was a serious damageto the steppe in Su’nan county,Gansu province.In order to understand the current situation of gerbil damage and its causes,we conducted a survey with route investigation and habitat investigation in the gerbil damaging areas.The results showed that a serious and sudden gerbil damage was occurred in partial mountainous desert steppe.The hole group coefficient,hole number per unit area,and absolute population density were increased to 0.33,3 394holes/hm2 and 526gerbil/hm2,respectively.The proportion of damaged grassland areawas 40%,which resulted in 1 239.15×104 kg of forage lost.Drought climates,fenced grasslands,suitable habitats,limitation of local control,aswell as enough living space,which led to higher reproduction,lower mortality and high population,and more seriously,this situation is spreading rapidly.更多还原