摘要
本文利用1987～1990年乌鲁木齐南山冬草场牧草高度动态资料,讨论了牧草高度增长符合Logistic曲线规律,建立高度增长的气象模式。证明当t_0=-a/b时,高度增长速度出现极大值;高度增长规律的两个特征点为:t_1=In(2+3^(1/2)-a/b和t_2=In(2-3^(1/2)-a/b。并讨论了模式及有关参数确定取样时间间隔、各特征点的气象条件及最佳打草期的应用。
Based on data of winter pastures 1987-90, in Mt Nanshan, Urumuqi, discussions ard made on the increase of the grass heiht in realtion with the logistic curve. Meteorological model of the evolution of grass height has been set up. It is shown that when to=-a/b,developing rate of height attains its maximum, rule of height increase has two characteristic points. t_1=(In(2+3^(1/2)-a)/b and t_2(In(2-3^(1/2)-a)/ b Using these models and parameters one can determine the sampling intervals,meteorological condictions all characteristic stages and the best moving peried.
出处
《中国草地》
CSCD
1993年第1期19-24,32,共6页
Grassland of China
关键词
草场
牧草
生长
logistic curve,meteorological moded
