蔡家川流域不同密度刺槐林下灌草多样性特征及其影响因子  

Characteristics of understory shrub and herb diversity and their influencing factors in Robinia pseudoacacia plantation at different densities in the Caijiachuan Watershed, China

作　　者：朱景康 唐洁 刘瑞 凌喜乐 常晨隆 梁文俊[1] 魏曦 ZHU Jingkang;TANG Jie;LIU Rui;LING Xile;CHANG Chenlong;LIANG Wenjun;WEI Xi(College of Forestry,Shanxi Agricultural University,Jinzhong 030801,Shanxi,China)

机构地区：[1]山西农业大学林学院,山西晋中030801

出　　处：《应用生态学报》2025年第2期452-460,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(32371970,31901365,31971644)资助。

摘　　要：本研究以蔡家川流域7种林分密度(700~900、900~1200、1200~1500、1500~1800、1800~2100、2100~2400和2400~2700株·hm^(-2))刺槐人工林为对象,分析不同密度条件下林分和土壤因子对灌草多样性的影响。结果表明:在7种林分密度中,900~1200株·hm^(-2)林下植物的物种丰富度最高(16.00),显著高于其他林分的物种丰富度平均值(12.50)。林分因子与灌草多样性的关联度为0.739,其影响强于土壤因子(0.671),且在700~1500和1800~2700株·hm^(-2)林分密度下,林分因子(0.751)的影响更显著;而1500~1800株·hm^(-2)林分密度下,土壤因子(0.660)对灌草多样性的影响占主导。平均冠幅和林分密度是影响林下灌木多样性的主要林分因子,平均树高和平均胸径是影响草本植物多样性的主要林分因子;全磷是影响灌草多样性的主要土壤因子。建议将林分密度控制在900~1200株·hm^(-2),有助于提高刺槐人工林稳定性和生物多样性。We analyzed the effects of stand and soil factors on shrub and herb diversity across seven stand densities(700-900, 900-1200, 1200-1500, 1500-1800, 1800-2100, 2100-2400, and 2400-2700 trees·hm^(-2)) of Robinia pseudoacacia plantations in the Caijiachuan watershed. The results showed that, among the seven stand densities, the species richness of understory plants was highest at 900-1200 trees·hm^(-2)(16.00), being significantly higher than the average richness(12.50) at other stand densities. The coefficience of correlation between stand factors and shrub and herb diversity was 0.739, which had a stronger influence than soil factors(0.671). The influence of stand factors(0.751) was more pronounced at densities of 700-1500 and 1800-2700 trees·hm^(-2). However, at the density of 1500-1800 trees·hm^(-2), soil factors(0.660) dominated the influence on shrub and herb diversity. The average crown width and stand density were the key stand factors affecting understory shrub diversity, while the average tree height and the average diameter at breast height were the key stand factors influencing herb diversity. Total phosphorus was the key soil factor affecting both shrub and herb diversity. We recommended to set stand density R. pseudoacacia plantation at 900-1200 trees·hm^(-2), which would contribute to higher stability and diversity.

关 键 词：刺槐 植物多样性 林分因子 土壤因子 灰色关联度 

分 类 号：S718.5[农业科学—林学]