摘要
克隆植物可通过调控其生物量分配格局与形态可塑性应对环境胁迫与干扰,在干旱沙区占据优势地位。阐明沙区克隆植物生物量分配格局与克隆生长形态可塑性对沙埋的响应对于探究沙生克隆植物应对风沙环境的适应策略具有重要意义。本文以乌兰布和沙漠典型根茎型克隆植物沙鞭(Psammochloa villosa)为研究对象,研究其生物量分配格局(地下:地上、水平:垂直)与克隆生长关键性状指标(根茎横截面积、节间长与芽库)对沙埋干扰的响应规律。结果表明,随沙埋深度增加,与地下:地上生物量分配格局无显著变化相比,沙鞭水平生物量占比显著降低(P<0.05);地下根茎横截面积随沙埋深度增加显著降低(P<0.05),而根茎节间长呈先增加后减小趋势;根茎芽随沙埋深度增加而增加,分蘖芽呈先增加后降低趋势。研究表明,沙鞭可通过调整其生物量分配格局应对沙埋胁迫,即增加垂直方向生物量。同时在深度沙埋条件下,根茎生理整合能力减弱,而增加其水平扩展能力(尤其是在中度沙埋深度)。此外,沙鞭还通过改变芽库大小与组成,作为一种适应性对策缓冲沙埋对沙区植物的干扰。
Clonal plants could regulate their biomass allocation pattern and morphological plasticity in response to environmental stresses and disturbances,which makes them the dominant plant in arid sandy area.Elucidating the responses of biomass allocation pattern and clonal growth plasticity to sand burial has important implications on exploring the adaptive strategies of clonal plants to sand dune environment.In this study,the typical rhizomatous clonal species in Ulanbuh Desert Psammochloa villosa was selected as research object.We studied the responses of biomass allocation pattern(above-vs belowground,horizontal vs vertical)and key clonal growth traits(rhizome cross-sectional area,internode length and bud bank)to sand burial.The results were as follows.(1)With the increasing sand burial depth,in contrast to no changes in aboveground-vs belowground biomass allocation,the ratio of horizontal-and vertical biomass decreased significantly(P<0.05).(2)The cross-sectional area of rhizome significantly decreased with the increasing sand burial depth(P<0.05)while the internode length showed a trend of first increased and then decreased.(3)Rhizome buds increased with the increase of sand buried depth,while tiller buds showed a trend of first increased and then decreased.Therefore,our study indicated that Psammochloa villosa could regulate its biomass allocation pattern to adapt to sand burial,i.e.,increased the vertical biomass,and under the deeply buried conditions,the physiological integration ability of rhizome weakened,but enhanced its horizontal expanding ability,especially under moderate sand burial.Furthermore,this species can regulate the size and composition of its belowground bud bank,which also can be considered as an important adaptive strategies to sand burial.
作者
郭子月
董亚威
巴超群
辛智鸣
张志铭
钱建强
GUO Ziyue;DONG Yawei;BA Chaoqun;XIN Zhiming;ZHANG Zhiming;QIAN Jianqiang(College of Forestry,Henan Agricultural University,Zhengzhou 450002,China;Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;Experimental Center of Desert Forestry,Chinese Academy of Forestry,Dengkou 015200,China)
出处
《内蒙古大学学报（自然科学版）》
CAS
北大核心
2022年第3期283-289,共7页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然科学基金项目(41877542)。
关键词
克隆植物
风沙干扰
环境胁迫
生理整合、水平扩展
clonal plants
wind and sand disturbance
environmental stress
physiological integration
horizontal expansion
