ON THE MATHEMATICAL MODELS FOR ZONALITY OF ALPINE MEADOW ON THE QINGHAI TIBETAN PLATEAU
高寒草甸分布的数学模式探讨

Two mathematical models for distributional zonalities of upper and lower limits of alpine meadow have been established respectively,which show that the distributional zonality of the upper limit is stronger than that of the lower limit.Concerning the trendsurface of the upper limit distribution,it has a maximum value of H at ( x,y )=(81 9,30 7),almost having the same longitude as that of the Gangdisi Nyainqentanglha Range.With regard to the trend surface of the lower limit distribution,it has an increasing tendency of H from southeast to northwest of the plateau.Study on the distribution of alpine meadow width indicates that the mentioned width is decreasing northwesterly.Altitudinally distributed alpine meadow starts disappearing from the boundary of x 2-7 7xy-0 4y 2 42 2x 790 2y- 14 821 4 =0