摘要
根茎型克隆植物在沙丘生态系统中占据优势,并在沙区植被恢复与重建中发挥关键作用,但其不同结构与功能应对风沙干扰的权衡策略尚未阐明。以乌兰布和沙漠固定沙丘优势根茎型克隆植物蓼子朴(Inula salsoloides)为研究对象,通过研究不同沙埋深度下的生长格局、繁殖策略与克隆生长构型,旨在探究根茎型克隆植物应对沙生环境的关键权衡策略。结果表明:随沙埋深度增加,生殖分枝数量与生物量显著增加,而营养分枝无明显变化,二者相对占比呈相反变化趋势;花序数量与生物量显著增加而地下芽数量与生物量无明显变化,同时花序数量与生物量占比显著增加,而地下芽数量与生物量占比显著降低;根茎芽数量、生物量及其相对占比显著减小,分蘖芽则显著增加。研究表明,根茎型克隆植物蓼子朴进化形成多种权衡策略以应对沙生环境,表现为严重沙埋干扰下倾向于进行生殖生长,增强有性繁殖潜力,且表现出更强的垂直生长能力。研究阐明了根茎型克隆植物适应沙生环境的关键权衡策略,为预测种群结构与群落动态及沙区植被恢复重建提供重要理论依据。
Due to their various advantages such as strong lateral spread ability,physiological integration,resource foraging behavior,and risk-spreading strategies,rhizomatous clonal species dominate sand dune ecosystems,and play an important role in the vegetation restoration and reconstruction of sandy regions.However,the trade-off strategies among different structures and functions of rhizomatous clonal species in response to aeolian disturbance have not yet been fully discussed.Thus in this study we selected the dominant rhizomatous clonal species Inula salsoloides on fixed sand dunes in the Ulanbuh desert as the target species.By investigating the growth pattern(reproductive growth vs.vegetative growth),reproductive strategy(sexual reproduction vs.vegetative reproduction),and clonal growth form(vertical growth by tiller buds vs.horizontal growth by rhizome buds)under different sand burial depths,we aimed to explore the key potential trade-off strategies of rhizomatous clonal species in response to the sandy environment.Results showed that with the increasing sand burial depth,the number and biomass of reproductive shoots significantly increased while there were no obvious changes in vegetative shoots,but their relative proportions showed an opposite trend.The number and biomass of inflorescences significantly increased but there were no significant changes in those of belowground buds,the number ratio and biomass ratio of inflorescences significantly increased but those of belowground buds decreased with the increasing sand burial depth.As regard with the belowground bud bank composition,the number,biomass,and their relative proportion of rhizome buds significantly decreased but those of tiller buds significantly increased with the increasing sand burial depth.Our study indicates that this rhizomatous clonal species has evolved a variety of key trade-offs to adapt to the sandy environment in arid sand dunes.Specifically,this rhizomatous clonal species tends to more proceed reproductive growth,enhance sexual reproduction potential,and adopt more vertical growth ability by increasing tiller buds with the increasing sand burial depth.This study preliminarily elucidates the key trade-offs of rhizomatous clonal species in response to sandy environment,and it not only provides an important theoretical basis for predicting clonal plant population structure and community dynamics,but also offers practical guidance for implementing vegetation restoration measures in arid sandy areas.
作者
李冬梅
田家泰
董亚威
陶金
辛智鸣
张志铭
钱建强
LI Dongmei;TIAN Jiatai;DONG Yawei;TAO Jin;XIN Zhiming;ZHANG Zhiming;QIAN Jianqiang(College of Forestry,Henan Agricultural University,Zhengzhou 450046,China;Experimental Center of Desert Forestry,Chinese Academy Forestry,Dengkou 015200,China)
出处
《生态学报》
北大核心
2025年第15期7492-7499,共8页
Acta Ecologica Sinica
基金
国家自然科学基金项目(41877542)
河南省重点研发与推广专项(科技攻关)(232102320245)。
关键词
干旱沙区
克隆植物
沙埋
资源分配
权衡策略
arid sand dune
clonal plant
sand burial
resource allocation
trade-off strategy
