摘要
土壤种子库作为地上植被更新的潜在种源,在植被自然恢复和演替过程以及生态系统建设中起着重要作用。该研究对贺兰山低山区不同海拔高度植物群落土壤理化性质变化与其土壤种子库特征之间的关系进行分析,以揭示贺兰山低山区植物群落的土壤种子库空间分布特征和自然恢复潜力。研究结果表明:(1)海拔1200 m处种子主要来源于一年生草本,海拔1600 m土壤种子库主要来源于多年生草本,海拔2000 m土壤种子库主要来源于灌木和小灌木;随着海拔升高,隶属于禾本科的物种数呈下降趋势,菊科和藜科呈增加趋势,蒺藜科、大戟科、豆科和玄参科消失。(2)5个海拔高度土壤种子库物种数均显著低于地上植被;在物种生活型组成上,土壤种子库中物种数占比最大为一年生草本,地上植被为多年生草本。(3)土壤理化性质对种子库物种多样性影响中,土壤pH、电导率最为显著。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源量。
As a potential source of vegetation regeneration above ground,soil seed bank plays an important role in the natural restoration and succession process of vegetation and the restoration of ecosystems.the relationship between the changes of soil physicochemical properties and the characteristics of soil seed banks(SSBs)of plant communities at different altitudes in the low mountain area of Helan Mountain,was discussed,in order to reveal the spatial distribution characteristics and natural restoration potential of SSBS of various plant communities.The results showed that:(1)the seeds resources of SSBs at 1200 m were from annual herbs,at 1600 m perennial herbs,and at 2000 m shrubs and small shrubs.With the increase of altitude,the annual herbs were the dominant species in SSBs at all five elevations.(2)The stability index,dominance index,evenness index and richness index of SSB at 1400 m were significantly lower than those at the other four elevations,that is,the SSB diversity at 1400 m was the lowest.(3)Soil pH and electrical conductivity were the most significant factors among physical and chemical properties that effected SBB diversity on species of seed bank.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 provenance required for above-ground vegetation restoration.
作者
李国旗
王雅芳
刘星
谢博勋
解盛
石云
LI Guoqi;WANG Yafang;LIU Xing;XIE Boxun;XIE Sheng;SHI Yun(Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan 750021, China;2Key Laboratory for Recovery and Restoration of Degraded Ecosystem in North-western China of Ministry of Education, Ningxia University, Yinchuan 750021, China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2022年第2期301-311,共11页
Acta Botanica Boreali-Occidentalia 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(2021NXZD5)
贺兰山矿区生态修复模式分析及典型治理示范区研究项目。
关键词
贺兰山
海拔
土壤种子库
土壤理化性质
Helan Mountain
altitude
soil seed bank
soil physical and chemical property
