濒危植物桫椤个体生态场梯度的研究

Study on the Individual Ecological Field Gradient of the Endangered Plant Alsophila spinulos

通过构建濒危植物桫椤(Alsophila spinulosa)个体生态场梯度模型,研究桫椤个体生态场梯度的变化特征。随着与场源距离的增加,桫椤个体生态场梯度先逐渐升高,达到最大值后又逐渐降低并收敛于零,其变化形式符合Rayleigh分布。不同地段的桫椤种群个体场梯度大小变化幅度不同,最大场梯度值以及出现最大场梯度时的作用距离亦不相同。随作用距离增加,场梯度的收敛速度差异增大。

Characteristics of the individual ecological field gradient of the endangered plant Alsophila spinulosa was studied by constructing the individual ecological field gradient model. With the increment of the distances to field source plants, the individual ecological field gradients of Alsophila spmulosa increased gradually at first to the maximal values, then decreased gradually and converged at zero at last. The varying form fitted Rayleigh distribution. Variances were found among the varying amplitudes of the individual ecological field gradients of Alsophila spinulosa in different sites. The maximal gradient values and effect distances of the maximal gradients also varied. With the increment of effect distances, the convergent velocities of field gradients were different.