荒漠草原不同林龄柠条灌丛生物量模型研究

Study on Biomass Model of Different Age Caragana Microphylla Shrubbery in Desert Steppe Region

灌木是森林生态系统中的一个重要组成部分.生物量是衡量植被生产力的重要指标,灌木的生物量与高度、基径之间存在密切的相关关系.本文以盐池县杨寨子村的荒漠草原地上柠条灌丛作为研究对象,采用生态学调查与综合评价的方法,构建不同林龄人工柠条基径平方与分枝长度乘积(D^2H)为自变量的生物量生长回归模型,研究结果表明:不同林龄的柠条灌丛生物量回归系数有一定的差别,在应用中根据需要选择不同的回归模型.对于不同林龄的柠条灌丛,以D^2H为自变量的二次多项式模型W=a+bX+cX^2和幂指数函数模型W=aX^b的回归方程相关性较好,可较好地描述柠条灌丛个体总生物量,可用于推算柠条灌丛生物量.

Tile bush is an important component in forest ecosystem. Biomass is an im- portant index for weighing the productivity of vegetation. The shrub biomass closely correlates with the height and basal diameter size of shrubs. The Caragana micrvphylla shrubbery in desert steppe region which located at Yangzh village in Yanehi county were taken to a test object to investigate the shrub biomass with combined use of ecological survey methods and comprehen- sive evahmtion methods. The Allometdc regression models of different age Caragana microphylla shrubbery were established to estimate the shrub biomass with D2H （ basal diameter square multiple plant height） variable. The results of the study show that the Allometric regression co- efficients had some differences for Different age Caragana microphylla shrubbery, and needed to select a different model. The relationship coefficient between biomass and D2H variable was the biggest for different age Caragana microphylla shrubbery. The models W = a ＋ bX ＋ cX2 and W =- aXb were suitable for describing the relationship between shrub morphology factors and biomass, which might be used for calculating the shrub biomass. Key words：