论文部分内容阅读
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.
Shrubs are an important part of forest ecosystem.The biomass is an important index to measure the productivity of vegetation, and there is a close correlation between the biomass of the shrubs and the height and the base diameter.In this paper, Using the methods of ecological investigation and comprehensive evaluation, the Caragana korshinskii shrub was used as the research object to construct the biomass growth regression model with independent factors of square root and branch length (D ~ 2H) The results showed that there were some differences in the regression coefficients between different age groups of Caragana korshinskii shrubs, and different regression models were chosen according to their needs.For Caragana korshinskii shrubs with different age, quadratic polynomials with D ~ 2H as independent variables The regression equation of model W = a + bX + cX ~ 2 and power exponential function model W = aX ~ b has good correlation, which can well describe the total biomass of individuals in Caragana korshinskii and can be used to calculate the biomass of Caragana korshinskii .