不同混交比例桉树—红锥混交林对林下植被和土壤肥力的影响研究  

Effects of Different Mixed Ratios of Eucalyptus robusta-Castanopsis hystrx on Understory Vegetation and Soil Fertility

作　　者：朱琪 邓海燕 马安琪 申琳琳 丁晓纲[2] 莫晓勇 ZHU Qi;DENG Haiyan;MA Anqi;SHEN Linlin;DING Xiaogang;MO Xiaoyong(College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou,Guangdong 510642,China;Guangdong Academy of Forestry,Guangzhou,Guangdong 510520,China;Guangdong Forestry Survey and Planning Institute,Guangzhou,Guangdong 510520,China)

机构地区：[1]华南农业大学林学与风景园林学院,广东广州510642 [2]广东省林业科学研究院,广东广州510520 [3]广东省林业调查规划院,广东广州510520

出　　处：《林业与环境科学》2024年第4期70-79,共10页Forestry and Environmental Science

基　　金：广东省林业科技创新项目(2023KJCX021);国家重点研发计划项目(2016YFD0600505)。

摘　　要：为探究不同混交比例的桉树Eucalyptus robusta、红锥Castanopsis hystrx混交林对土壤肥力和林下植被多样性的影响,以广东省廉江市石岭林场4种混交比例的桉树—红锥混交林(桉树为华桉一号,红锥为当年生盆栽实生苗)为研究对象,通过野外调查、取样、分析以及综合比较,对不同混交比例下的桉树—红锥混交林的土壤理化性质、林下植被组成和植物多样性进行分析。结果表明,桉树—红锥5∶1混交林林下灌木和草本植物最多,1∶1混交林林下灌木物种组成最少,3∶3混交林林下草本物种组成最少。4种桉树—红锥混交林林下植被Patrick丰富度指数存在显著差异(P<0.05),表现为5∶1混交林显著高于3∶3混交林。3∶1混交林林地的土壤最大持水量最大,其次为5∶1混交林;3∶1混交林的土壤最大持水量在0~20 cm,20~40 cm,40~60 cm,3个土层均显著高于1∶1混交林,在20~60 cm土层均显著高于3∶3混交林;5∶1混交林林地的最大持水量仅在0~20 cm土层显著高于1∶1混交林,在20~40 cm土层显著高于3∶3混交林。桉树—红锥混交林林下植被的Simpson多样性指数在5∶1混交林和1∶1混交林与全磷含量显著负相关;Shannon-Wiener变化度指数在3∶3混交林与全磷含量显著负相关,在1∶1混交林与全磷含量显著负相关;Patrick丰富度指数在3∶3混交林与土壤非毛管孔隙度显著正相关,在3∶3混交林与全氮含量显著负相关;Pielou均匀度指数在3∶1混交林与土壤非毛管孔隙度和土壤通气度均显著负相关,在5∶1混交林与与全磷含量显著正相关。综上所述,5∶1混交比例更适合林下植物的生长,但1∶1的混交比例更适合土壤肥力的保存。In order to investigate the effects of different mixed proportions of Eucalyptus robusta and Cas-tanopsis hystrx mixed forests on soil fertility and understory vegetation diversity,four different proportions of eu-calyptus and red cone mixed forests(E.robusta-C.hystrx is a potted seedling of the same year)in Shiling For-est Farm,Lianjiang city,Guangdong province were selected as the research objects.Through field investiga-tion,sampling,analysis,and comprehensive comparison,the soil physicochemical properties of E.robusta and red cone mixed forests under different mixed proportions were studied to analyze the composition of under-story vegetation and plant diversity.The results showed that the understory shrubs and herbaceous plants were the most abundant in the 5∶1 mixed forest of E.robusta,the understory shrub species were the least abundant in the 1∶1 mixed forest,and the understory herbaceous species were the least abundant in the 3∶3 mixed forest.There was a significant difference in the Patrick richness index of understory vegetation among the four types of E.robusta mixed forests(P<0.05),with the 5∶1 mixed forest being significantly higher than the 3∶3 mixed forest.The maximum soil moisture capacity of the 3∶1 mixed forest is the highest,followed by the 5∶1 mixed forest.The maximum soil moisture capacity of the 3∶1 mixed forest is significantly higher in the 0-20 cm,20-40 cm,and 40-60 cm soil layers than in the 1∶1 mixed forest,and significantly higher in the 20-60 cm soil layer than in the 3∶3 mixed forests.The maximum water holding capacity of the 5∶1 mixed forest is significantly higher in the 0-20 cm soil layer than in the 1∶1 mixed forest,and significantly higher in the 20-40 cm soil layer than in the 3∶3 mixed forests.The Simpson diversity index of understory vegetation in E.robusta mixed forest is significantly negatively correlated with total phosphorus content in 5∶1 mixed forest and 1∶1 mixed forest.The Shannon Wiener index of variation is significantly negatively co

关 键 词：林下植被 土壤肥力 混交 桉树 

分 类 号：S718.5[农业科学—林学]