贺兰山低山区土壤种子库与地上植被关系分析  

Analysis of Relationship between Soil Seed Bank and Aboveground Vegetation in Low Mountain Area of Helan Mountain

作　　者：王雅芳 李国旗[1,2,3] 石云 刘星[1,2,3] 谢博勋 解盛 WANG Ya-fang;LI Guo-qi;SHI Yun;LIU Xing;XIE Bo-xun;XIE Sheng(Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China,Ningxia University,Yinchuan,Ningxia 750021,China;Key Laboratory for Recovery and Restoration of Degraded Ecosystem in North-western China of Ministry of Education,Ningxia University,Yinchuan,Ningxia 750021,China;School of Ecology and Enviroment,Ningxia University,Yinchuan,Ningxia 750021,China;School of Geography and Planning,Ningxia University,Yinchuan,Ningxia 750021,China)

机构地区：[1]宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,宁夏银川750021 [2]宁夏大学西北退化生态系统恢复与重建教育部重点实验室,宁夏银川750021 [3]宁夏大学生态环境学院,宁夏银川750021 [4]宁夏大学地理科学与规划学院,宁夏银川750021

出　　处：《草地学报》2023年第1期166-172,共7页Acta Agrestia Sinica

基　　金：中央引导地方科技创新项目;中国工程院院地合作项目(2021 NXZD5);银川市自然资源局科研项目(022104129003)资助。

摘　　要：土壤种子库是地上植被更新的潜在种源,它影响地上植被的自然恢复、植被群落的演替进程和区域生物多样性维持。通过对贺兰山低山区不同海拔高度植物群落进行室内种子萌发试验和野外植被调查,发现5个海拔高度的土壤种子库植物种均以一年生草本居多,而相对应的地上植被群落在5个海拔高度的物种重要值均呈现为一年生草本<灌木或半灌木<多年生草本;土壤种子库和相对应的地上植被的物种多样性指数均在海拔1200 m处最高;土壤种子库种子密度与相对应的地上植被密度的关系可用对数曲线表示,随着地上植被密度的增加土壤种子库种子密度呈减少趋势。贺兰山低山区5个海拔高度土壤种子库种子密度和物种多样性均较低,无法满足植被自然恢复需求,可通过采取飞播等生态恢复措施来弥补表层土壤种子的不足,从而满足地上植被恢复所需种子数量。Soil seed bank(SSB)is a potential source of aboveground vegetation renewal,which affects the natural restoration of aboveground vegetation,the succession process of vegetation community and the protection of regional biodiversity.Through indoor seed germination experiments and field vegetation surveys of plant communities at different altitudes in the low mountain area of Helan Mountain,it found that the majority of plant species in soil seed banks at five altitudes were annual herbs,while the species importance values of the corresponding aboveground vegetation communities at all five altitudes were annual herbs<shrubs or semi-shrubs<perennial herbs;The species diversity index of the SSB and the corresponding aboveground vegetation was the highest at the altitude of 1400 m;The relationship between the seed density of the SSB and the corresponding aboveground vegetation density could be represented by a logarithmic curve,and the seed density of the soil seed bank decreased as the aboveground vegetation density increased.The SSB density and species diversity at five elevations in the low mountainous area of Helan Mountain were low,which could not meet the demand of natural vegetation restoration.Ecological restoration measures such as aerial seeding could be adopted to make up for the shortage of seeds in surface soil,so as to meet the quantity of seeds requirement for aboveground vegetation restoration.

关 键 词：土壤种子库 地上植被 物种多样性 种子密度 

分 类 号：Q948.15[生物学—植物学]