长芒苋入侵对弃耕地土壤种子库群落特征的影响  

Effects of Amaranthus palmeri on Soil Seed Bank Community Characteristics in Abandoned Cultivated Land

作　　者：李妹洋 李龙沁 郝广 康濒月 高越 李洪远[1,2] LI Mei-yang;LI Long-qin;HAO Guang;KANG Bin-yue;GAO Yue;LI Hong-yuan(College of Environmental Science and Engineering,Nankai University,Tianjin 300350,China;Tianjin Key Laboratory of Cross-media Combined Pollution Control Technology,Tianjin 300350,China)

机构地区：[1]南开大学环境科学与工程学院,天津300350 [2]天津市跨介质复合污染环境治理技术重点实验室,天津300350

出　　处：《生态与农村环境学报》2023年第9期1188-1195,共8页Journal of Ecology and Rural Environment

基　　金：天津市重大科技专项与工程(18ZXSZSF00200)。

摘　　要：为阐明外来入侵植物长芒苋(Amaranthus palmeri)对土壤种子库群落特征的影响,选取长芒苋不同入侵压力下的弃耕地土壤种子库为研究对象,通过野外调查和萌发试验,揭示弃耕地土壤种子库群落对长芒苋入侵的响应,旨在为入侵植物的科学防控提供依据。结果表明:(1)土壤种子库共计出现30种植物,隶属于17科30属,以一年生草本为主。与轻度入侵区组相比,重度入侵区组土壤种子库物种多样性指数和种子密度都显著降低;土壤种子库物种多样性指数对土层深度的响应不明显,且入侵压力与土层深度之间无交互作用。(2)土壤种子库NMDS排序及PERMANOVA分析结果进一步表明,轻度入侵区组与重度入侵区组群落结构差异显著;重度入侵区组长芒苋已在该地建立长久性土壤种子库,影响本地生态系统的稳定性。(3)种间相关分析结果表明,轻度入侵压力和重度入侵压力均会对大豆(Glycine max)、狗尾草(Setaria viridis)和碱蓬(Suaeda glauca)3种植物产生负面效应。To explore the effects of the alien invasive plant Amaranthus palmeri on the characteristics of soil seed bank community,this study selected abandoned soil seed bank under different invasion pressures of Amaranthus palmeri as the research subject,and revealed the response of abandoned soil seed bank community to Amaranthus palmeri invasion through field investigation and germination experiment,so as to provide the basis for the scientific control of invasive plants.The results show that:(1)A total of 30 species of plants belonging to 17 families and 30 genera,mainly annual herbs,were found in the soil seed bank.The species diversity index and seed density of soil seed bank were significantly lower in the area being severely invaded than in the area being lightly invaded.The species diversity index of the soil seed bank had no obvious response to soil depth,and the invasion pressure has no interaction with soil depth.(2)The analyses of soil seed banks by using the non-metric multidimensional scaling(NMDS)further show that there were significant differences in community structure between the two groups under different invasion pressures.(3)The invasion at moderate and high degrees both exerted negative effects on soybean(Glycine max),Setaria viridis and Suaeda glauca.

关 键 词：入侵植物 长芒苋 土壤种子库 入侵压力 物种多样性 

分 类 号：X176[环境科学与工程—环境科学]