科尔沁沙地流动沙丘优势物种构件特征的差异性及相关性分析  

Differences and correlation analysis of dominant species component characteristics in mobile sand dunes in Horqin Sandy Land

作　　者：张优倩 贾美玉 陈秋华 李皓伦 王泽禹 李国栋 杨娟 ZHANG You-qian;JIA Mei-yu;CHEN Qiu-hua;LI Hao-lun;WANG Ze-yu;LI Guo-dong;YANG Juan(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学水资源与环境工程学院,江西南昌330013

出　　处：《环境生态学》2023年第7期71-78,86,共9页Environmental Ecology

基　　金：2022年江西省大学生创新创业训练计划(202210405025);东华理工大学博士科研启动基金项目(理工类)(202110405024);东华理工大学大学生创新创业实践中心建设项目“土壤污染生物修复实践中心”(2022ZX06)资助。

摘　　要：沙地的植被恢复研究一直是荒漠化防治的关键,而沙地物种的适应策略是众多生态学者关注的焦点。选取科尔沁沙地流动沙丘3个优势物种烛台虫实(Corispermum candelabrum)、狗尾草(Setaria viridis)和沙蓬(Agriophyllum squarrosum)作为研究对象,通过科尔沁沙地优势物种构件生物量及水分含量的差异性及相关性分析,揭示3个物种结构上的适应策略。结果表明:1)同一物种的地上和地下生物量之间存在显著差异性,且每个物种的地上和地下生物量呈显著正相关关系,物种会自发调整自身的生物量分配情况,从而适应极端气候条件;不同物种的地上和地下生物量均存在显著差异性,当与其他物种生存于同一空间时,有的植物可能会调整自身的生物量分配情况,从而避免直接进行物种间的竞争。2)同一物种的地上和地下水分含量之间存在显著差异性,且地上和地下水分含量呈显著正相关关系,极端干旱气候发生时,物种会将自身水分进行再分配,将更多的水分供给根系,确保物种的生存;优势物种间的地上和地下水分含量均存在显著差异性;由于群落资源有限,物种除了调整自身生物量分配外,还会重新分配水分,以减弱物种间的竞争关系,获得更大的生存可能性。了解物种间各构件的差异性和相关性,有利于理解物种自身在干旱条件下的存活机理和适应特点,进一步预测沙地植被恢复的动态过程,加快沙地植被的恢复。The study of vegetation restoration in sandy land has always been the key to desertification control,and the adaptation strategy of sandy land species is the focus of many ecological scholars.Selecting three dominant species of the moving sand dunes in Horqin Sandy Land,namely,Coripermum candelabrum,Setaria viridis and Agriophyllum squarrosum,as the research objects,the structural adaptation strategies of the three species were revealed through the analysis of the differences and correlation between the biomass and water content of the dominant species components in Horqin Sandy Land.The results showed that,there was a significant difference between aboveground and underground biomass of the same species,and the aboveground and underground biomass of each species were significantly positively correlated.The species would automatically adjust their biomass allocation to adapt to extreme climatic conditions.Among different species,the aboveground and underground biomass were significantly different.When living in the same space with other species,some plants may adjust their biomass distribution to avoid direct competition among species.There was a significant difference between the aboveground and underground water content of the same species,and the aboveground and underground water content of each species were significantly positively correlated.When the extreme dry climate occurred,the species would redistribute their water,suppling more water to the root system to ensure the survival of the species.There were significant differences between the aboveground and underground water content of dominant species.Because the resources of the community were limited,the species would not only adjust their biomass distribution,but also redistribute water to ensure that the competition between species was weakened and greater survival possibilities were obtained.By understanding the differences and correlation of each component among species,it is helpful to understand the survival mechanism and adaptation characteristics

关 键 词：构件生物量 差异性分析 相关性分析 科尔沁沙地 

分 类 号：Q948[生物学—植物学]