论文部分内容阅读
本文根据柠条(Caragana korshinskii)生长的特点,即生长速率随灌木林龄的变化呈近似正态分布的特征曲线,根据曲线的几何特征,提出以柠条生长速率与峰值和右拐点连线的斜率相等的点为平茬始点,以几何曲线的右拐点为平茬终点的平茬方案。长期观测结果表明,柠条生长指标符合Logistic方程,本文以Logistic生长函数为例,说明了柠条灌木林平茬时间确定方法的具体推导过程。最后结合柠条生长指标(株高、分枝和生物量),对不同立地条件下柠条灌木林的合理平茬时间进行了探讨,结果表明,不同立地条件下柠条的合理平茬时间存在一定的差异,这种现象是由不同立地条件下水热环境的差异造成的。
According to the growth characteristics of Caragana korshinskii, that is, the growth rate is nearly normal distribution curve with shrub age, according to the geometric characteristics of the curve, it is proposed that the growth rate of Caragana korshinskii is connected with the peak and the right inflection point The points with equal slope are the beginning of stubble, and the right turning point of the geometric curve is the stubble plan of the end of stubble. Long-term observation results show that the growth index of Caragana korshinskii is in accordance with the Logistic equation. In this paper, the Logistic growth function is taken as an example to illustrate the specific derivation of the method for determining the stubble time of Caragana korshinskii shrub. Finally, combining the growth index of Caragana korshinskii (plant height, branch and biomass), the reasonable stubble time of Caragana korshinskii shrubs under different site conditions was discussed. The results showed that reasonable stubble time of Caragana korshinskii A certain difference, this phenomenon is caused by the difference between the hydrothermal environment under different site conditions.