摘要
从高寒地区3组分禾草混播草地群落的种间竞争机制出发,建立了适合高寒地区3组分禾草混播草地群落种间竞争机制的Lotka-Volterra竞争效应模型,并对该模型所描述的竞争进行了计算机模拟试验。模拟结果表明,试验所选的3种高寒地区3组分禾草混播草群的种间相容性分为两种类型,即不稳定的群落:多叶老芒麦+无芒雀麦+垂穗披碱草和垂穗披碱草+多叶老芒麦+扁穗冰草,其竞争结局是:群落内多叶老芒麦和垂穗披碱草二者共同表现为优势种群,无芒雀麦或扁穗冰草与优势植物的竞争结果将导致其从群落中消失,多叶老芒麦和垂穗披碱草种群将能稳定共存;不稳定-稳定过渡群落:无芒雀麦+多叶老芒麦+扁穗冰草,在没有多叶老芒麦种群的时候,无芒雀麦和扁穗冰草种群可以共存,但是如果多叶老芒麦种群加入无芒雀麦和扁穗冰草所占的区域,它将导致无芒雀麦和扁穗冰草种群趋于灭绝。通过对3个混播试验组计算机模拟竞争模型的竞争效应分析,其结果与方法对科学建植同类型的多年生混播人工草地具有一定的指导意义。
Based on interspecific competition mechanism in mixed grassland of cultivated perennial grass in alpine region of QinghaiTibetan plateau of China, a LotkaVolterrathe competition model of three populations was established.In order to find the ideal ways to maintain mixed grassland of cultivated perennial grass stability, from May,1998 to October of 2000, this study was conducted at the Jingqianghe Alpine Grassland Station of Gansu Agricultural University, which is located in Tianzhu County.According to the data obtained, the computer simulation experiment was carried out. The results indicated that all the communities of grass in this study could be assorted into 2 groups according to their compatible abilities, namely , the unstable communities, including Elymus sibiricus + Bromus inermis + E.nutans, E.nutans + E.sibiricus + Agropyron cristatum, and the transition community between stable and unstable communities, B.inermis + E.sibiricus + A.cristatum.It is suggested that this study provides a new approach to deal with the further improvement of interspecies competition models of the mixed grassland of cultivated perennial grass in alpine region and the mixed grassland competitiongrowth relationship ecological study.
出处
《草业学报》
CSCD
2003年第3期79-82,共4页
Acta Prataculturae Sinica
基金
甘肃省科技厅"九五"攻关项目"高寒牧区人工草地及其集约化畜牧业研究"(GK971-2-36A)资助。
关键词
高寒地区
多年生禾草
混播草地
种间竞争
数学模型
计算机试验
alpine region of Qinghai-Tibetan Plateau of China
cultivated perennial grass
mixture grassland
interspecies competition
mathematical model
computer simulation analysis
