濒危植物小蓬竹地上部生态场效应分析

Ecological field of aboveground of endangered plant Drepanostachyum luodianense

[目的]分析小蓬竹（Drepanostachyum Luodianense）地上部生态场效应,为建立小蓬竹濒危机制及合理保护提供理论基础.[方法]设置7个小蓬竹种群（Q1～Q7）样地,实测样地内所有小蓬竹竹丛的平均冠丛高、冠丛半径、竹丛株数和竹丛直径,通过构建小蓬竹生态场模型,对小蓬竹地上部生态场的作用特性、空间变化规律和作用范围进行定量研究.[结果]7个样地小蓬竹种群的平均生态势最大值大小次序为φ7＞ φ4＞ φ3＞ φ6＞ φ1＞ φ2＞ φ5,小蓬竹地上部生态势随着与小蓬竹作用距离的增加逐渐减小,并在场源处达最大值;不同样地小蓬竹生态势的消减形式及刻画生态势空间变化率的生态场梯度曲线分别近似于Gaussian分布与Rayleigh分布;根据经验模型估测得到小蓬竹地上部生态场有效作用距离10.62～14.52 m,作用范围平均为12.08 m.[结论]小蓬竹地上部生态场生态势的大小、生态场梯度、作用范围均与其形态大小紧密相关,场源植物活力参数为影响生态势大小的主导因子.

[Objective]Ecological field of aboveground of endangered plant Drepanostachyum luodianense was studied to provide scientific references for establishing its endangered mechanism and reasonable protection. [Method]Seven plots of D. luodianense （Q1-Q7） were set to detect average height of crown plexus, crown clump radius, number of bamboo trees and bamboo diameter, based on which D. Luodianense ecological field model was established to quantitatively study effect charac- teristics, spatial variation and action range. [Result] φ7〉 φ4〉 φ3〉 φ6〉 φ1〉 φ2〉 φ5 was the order of the maximal values of average ecological potential of D. luodianense in 7 different sites. Along with the increase of the distance from 19. Luodianense to the ecological potential of D. luodianense, the value of the ecological potential gradually reduced, and reached its maximum in the field source. The extinction form of ecological potential and ecological field gradient curve of depicting space variation of ecological potential was similar to Gaussian and Rayleigh distribution, respectively. According to the experience model, effec- tive action range was estimated as 10.62-14.52 m with the average value of 12.08 m. [Conclusion]Ecological potential, eco- logical field gradient and action range are all closely related to shape size, and the main leading factor affecting ecological po- tential is dynamic parameter of plants in field source.