黄土区场刺槐×油松复垦地物种演替规律分析

为了进一步了解研究区复垦地物种演替规律,通过野外调查获取样地复垦17年后植被数据,采用数据分析法研究刺槐×油松复垦模式下植被种群数量结构特征与空间分布格局。结果表明:在黄土区刺槐×油松复垦模式下刺槐的存活率为34.56%,远低于油松的存活率94.39%;侵入树种主要有榆树和杨树,侵入树种占乔木层物种总数的15.42%;刺槐的径级结构在1cm和10cm出现峰值,油松的径级结构在7cm出现峰值;样地草本中菊科的重要值为37.38,禾本科的重要值为13.33。刺槐更新个体较多但成活率低,油松成活率较高,刺槐纯林易受到榆树和杨树的侵入。草本植物中菊科和禾本科重要值最高,大籽蒿为优势物种。

Analysis of Succession Pattern of Locust and Pine in Reclamation Land of Loess area

In order to further understand the species succession in the reclamation land,the population structure and spatial distribution pattern of locust and pine at vegetation dates of 17 years were investigated by data analysis.The results show that under the loess area reclamation mode,locust survival rate was 34.56％,which was much lower than pine survival rate of 94.39％; invasive species are mainly elms and poplars,and invasive species accounts for 15.42％ of the total number of tree species; the diameter structure of locust arrives peak at 1cm and 10cm,and the pine arrives its peak at 7 cm; the important values of compositae herbs and gramineae herbs are 37.38 and 13.33,respectively.In this study,it can be found that update individual of locust is high with low survival rate,and the survival rate of pine is high.Locust plantation is susceptible to the invasion of elms and poplars.In addition,the importance values of compositae and gramineae are high in herbs,and the dominant species is artemisia sieversiana.