FAST周边喀斯特土壤养分资源轴的植物优势种生态位  

The niche of dominant plant species in the karst soil nutrient resource axis around FAST

作　　者：张婷 张建利 张晨 杨涛 溥丽华 赵卫权 陈芃利 ZHANG Ting;ZHANG Jianli;ZHANG Chen;YANG Tao;PU Lihua;ZHAO Weiquan;CHEN Pengli(College of Eco-Environmental Engineering,Guizhou Minzu University,Guiyang 550025,China;The Communist Youth League Committee of Guizhou Minzu University,Guiyang 550025,China;Institute of Mountain Resources of Guizhou Province,Guiyang 550001,China)

机构地区：[1]贵州民族大学生态环境工程学院,贵阳550025 [2]共青团贵州民族大学委员会,贵阳550025 [3]贵州省山地资源研究所,贵阳550001

出　　处：《生态学杂志》2023年第8期1820-1828,共9页Chinese Journal of Ecology

基　　金：贵州省科技计划;贵州科学院创新核块科研启动项目(钱科院C字[2021]1号)项目(黔科合基础[2019]1421号);贵州省科技支撑计划项目(黔科合支撑[2021]一般460、黔科合支撑[2023]一般200-02、黔科合支撑[2022]一般200-02);贵州科学院省级科研专项(黔科院科专合字[2021]03)资助。

摘　　要：为了解喀斯特峰丛洼地土壤养分资源轴的生态位特征,本研究以国家重大工程500米口径球面射电望远镜(FAST)周边森林植物优势种为对象,采用典范对应分析、Levins生态位宽度和Pianka生态位重叠指数分析优势种在土壤养分资源轴上的生态位特征。结果表明:(1)土壤全磷、速效氮、有机碳对优势种的分布具有显著性影响(P<0.05);(2)麻栎、地果、盐麸木在土壤养分资源轴上的生态位宽度均较高,更适宜研究区的生境。白栎、羊耳菊、豹皮樟在土壤养分资源轴上的生态位宽度均较低,其对资源利用的效率较低。生态位宽度受到物种重要值的影响,生态位宽度较高的物种重要值也较高;(3)生态位重叠值较高的物种并未占有较高的生态位宽度,而是介于中下游的位置。综合土壤养分资源轴,生态位重叠值大于0.5的物种占总物种的50%。总之,FAST周边植被较为稳定,全磷、速效氮、有机碳是影响FAST周边优势种分布的重要土壤养分因子。To understand the niche characteristics of plants along soil nutrient resource axis in the karst peak-cluster depression,we analyzed the niche characteristics of dominant plant species in forests around the Five-hundred-meter Aperture Spherical radio Telescope(FAST)on soil nutrient resource axis using canonical correspondence analysis,Levins niche breadth,and Pianka niche overlap index.The results showed that total soil phosphorus,available nitrogen,and organic carbon had significant effects on the distribution of dominant species(P<0.05).The niche breadths of Quercus acutissima,Ficus tikoua,and Rhus chinensis on the soil nutrient resource axis were higher and more suitable for the habitat of the study area.Quercus fabri,Inula cappa,and Litsea coreana had lower niche breadth on the soil nutrient resource axis,with lower resource utilization efficiency.The niche breadth was influenced by the species'importance value,in that species with higher niche breadth had higher importance values.The species with higher niche overlap index did not occupy higher niche breadth but were in the middle and lower values.The species with niche overlap greater than 0.5 accounted for 50%of the total species number when considering the soil nutrient resource axis.In conclusion,vegetation around FAST was relatively stable,and total phosphorus,available nitrogen,and organic carbon were important soil nutrient factors affecting the distribution of dominant species around FAST.

关 键 词：喀斯特 峰丛洼地 生态位宽度 生态位重叠指数 土壤养分资源轴 FAST 

分 类 号：Q948.1[生物学—植物学]