应用Logistic模型探求封育草场苜蓿种群密度的研究  

A Study of Optilnal Density of Alfalfa in the Sealed Pasture With Logistic Model

作　　者：昝林森[1] 杨云贵[1] 王倩[1] 

机构地区：[1]西北农业大学,陕西杨陵712100

出　　处：《黄牛杂志》1993年第3期12-15,共4页Journal of Yellow Cattle Science

摘　　要：在陕西渭北对严重退化的半人工草场(天然牧草+紫花苜蓿)进行了为期6年(1986—1991)的封育研究,并应用Logistic模型探讨了该草场主要经济类牧草——紫花苜蓿的最佳种群密度及其封育时限。结果表明,紫花苜蓿种群密度与草场生产力呈显著直线相关,y=1.0819+2.5151x(r=0.9872);其最佳种群密度为76.6——96.0株/m^2;草场封育以3—4年为限:对于轻度过牧的草场,如需封育,用1—2年时间即可重新开放。The study was conducted for the seriously deteriorated semi--artificial pasture (Be-ing composed of atural rass and alfalfa) of Weibei rainfed highland of ShaanxiProvince which sealed for six years, in order to search for the ptimal density and seal-ing time limits of alfalfa——the main economic grass of the pasture. The result showedthat here was a significant linear relationships between the density of alfalfa(X) andpasture productivity (Y) which can be xpressed by such equation of Y=1. 0819+2. 5151X,r=0.9872. The optimal density of alfalfa in this pasture was 79. ——96. 0per square meter. The reasonable sealing period of deteriorated pasture was 3--4 years.The light vergrazing pasture can be started grazing the animals after 1 or 2 years seal-ing.

关 键 词：草场 苜蓿 密度 

分 类 号：S551.704[农业科学—作物学]