摘要
作为全球气候变化的重要组成部分,降雨格局变化能够对各类植物产生不同的影响。虎尾草为退化盐碱草地恢复的主要先锋种植物之一,降雨格局变化如何影响其分株和根系等特征对于全球变化背景下退化盐碱地的生态恢复至关重要。本研究通过人工模拟降雨格局变化试验,设置了3个降水量(减少30%、不变、增加30%)和2个降雨间隔(1、2 d),研究了虎尾草地上分株和地下根系形态特征对降雨格局变化的响应。结果表明:1)降雨格局的变化对虎尾草有性生殖特征几乎无影响,随着降水量增加或降雨间隔延长营养繁殖特征具有增加的趋势。2)降雨间隔和降水量对虎尾草根系影响程度不同,降雨间隔为主要影响因素,且二者相互依赖。降水量一定时,随着降雨间隔的增加,总根长、总表面积、总体积和根直径显著降低。3)降水量和降雨间隔均影响虎尾草生物量的积累,降雨间隔为主要影响因素,随着降雨间隔的增加,根、茎、总生物量均显著降低,叶和花序生物量具有减小的趋势,但是影响不显著。
As an important part of global climate change,changes in rainfall patterns will have different effects on various types of plants.Chloris virgata is one of the main pioneer species for the restoration of degraded saline-alkali grasslands.To design optimal ecological restoration strategies for degraded saline-alkali land in the background of global change,it is important to understand how the changes in rainfall patterns will affect the characteristics of ramets and roots of C.virgata.We determined the effects of several simulated rainfall patterns(decreased by 30%,unchanged,increased by 30%)and rainfall intervals(1 and 2 days)on the aboveground ramet and underground root morphological characteristics of C.virgata.It was found that:1)The changes in rainfall pattern had almost no effect on the sexual reproduction characteristics of C.virgata.With increasing rainfall amount or increasing rainfall interval,vegetative reproductive characteristics tended to be enhanced.2)Rainfall interval and rainfall amount had different effects on the roots of C.virgata.Rainfall interval had the greatest influence,although two factors were interdependent.When the rainfall amount was unchanged,the total root length,total root surface area,total root volume,and root diameter decreased significantly with increasing rainfall interval.3)Both rainfall amount and rainfall interval affected biomass accumulation,with rainfall interval being more important.The root biomass,stem biomass,and total biomass significantly decreased with increasing rainfall interval,and the biomass of leaves and inflorescences showed a decreasing trend,but this was not statistically significant.
作者
杨林
陈默
李海燕
杨允菲
YANG Lin;CHEN Mo;LI Hai-yan;YANG Yun-fei(Key Laboratory of Vegetation Ecology,Ministry of Education,Institute of Grassland Science,School of Life Science,Northeast Nor-mal University,Changchun 130024,China)
出处
《草业学报》
CSCD
北大核心
2021年第1期181-188,共8页
Acta Prataculturae Sinica
基金
国家重点研发计划项目(2016YFC0500602)
国家自然科学基金项目(31670427,31672471)
吉林省科技厅自然科学基金项目(20170101150JC)资助。
关键词
降水量
降雨间隔
先锋植物
分株
根系
rainfall amount
rainfall interval
pioneer plant
ramet
root
