干旱沙区克隆植物沙鞭根茎拓殖速率的调控要素分析  

Analysis of Regulatory Factors of Rhizome Colonization Rate in Clonal Plant Psammochloa villosa in Arid Sand Dune

作　　者：董亚威 郭子月 陶金 张志铭[1] 辛智鸣[2] 钱建强 DONG Yawei;GUO Ziyue;TAO Jin;ZHANG Zhiming;XIN Zhiming;QIAN Jianqiang(College of Forestry,Henan Agricultural University,Zhengzhou 450002,China;Eperimental Center of Desert Forestry,Chinese Academy of Forestry/Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station,Dengkou O15200,China)

机构地区：[1]河南农业大学林学院,郑州450002 [2]中国林业科学研究院沙漠林业实验中心/内蒙古磴口荒漠生态系统国家定位观测研究站,内蒙古口015200

出　　处：《内蒙古大学学报（自然科学版）》2022年第6期621-628,共8页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金项目(41877542)。

摘　　要：干旱沙区风沙干扰与环境胁迫并存,严重威胁沙区优势根茎型克隆植物个体生长、种群更新与拓殖以及生态系统结构与功能。阐明根茎型克隆植物拓殖速率的调控要素与机制对于揭示沙生克隆植物适应对策、指导沙区植被恢复重建具有重要意义。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,研究不同沙埋深度下沙鞭根茎拓殖速率以及生物(根茎生物量)与非生物因素(土壤水分、土壤养分)对其的调控机制。结果表明:(1)沙鞭根茎拓殖速率随沙埋深度增加显著降低(P<0.05);(2)根茎生物量随沙埋深度增加显著降低(P<0.05),沙埋通过影响根茎生物量间接影响根茎拓殖速率;(3)与土壤养分相比,拓殖速率更多受土壤水分调控,具体表现为浅层土壤水分较低条件下,根茎拓殖速率显著较高。因此,在干旱沙区沙埋深度通过对根茎型克隆植物根茎生物量和土壤环境因子的影响直接或间接调控其拓殖速率。研究结果阐明了沙埋对根茎型克隆植物根茎拓殖速率的调控机制,为干旱沙区植被恢复与重建提供理论依据。The aeolian disturbance and environmental stress coexist in arid sand areas,seriously threatening the growth of plant individuals,population regeneration and colonization,as well as ecosystem structure and function of dominant rhizomatous clones in sandy areas.It is important to elucidate the regulatory factors and mechanisms of colonization rate of rhizomatous clones to reveal the adaptive strategies of sandy clones and guide vegetation restoration and reconstruction in sandy areas.This study took the typical rhizomatous clonal plant Psammochloa villosa in Ulanbuh desert as target species,aiming to investigate its rhizome colonization rate and its biotic(rhizome biomass)and abiotic(soil moist and soil nutrient)influencing factors.Results showed that (1)the colonization rate of rhizome significantly decreased with increasing sand burial depth(P<0.05).(2)The rhizome biomass also significantly decreased with increasing sand burial depth(P<0.05).Sand burial indirectly affected the colonization rate of rhizome through its effects on rhizome biomass.(3)Compared with soil nutrient,soil moisture had larger regulatory effect on colonization rate.Specifically,the colonization rate was significantly higher in shallow soil profile with lower soil moisture.Therefore,through its effects on rhizome biomass and soil environmental factors,sand burial depth could directly and indirectly regulate the colonization rate of rhizomatous clonal plants.This study revealed the regulatory mechanisms of sand burial on rhizome colonization rate of clonal plants,and provided theoretical basis for the vegetation restoration and reconstruction in arid sandy dunes.

关 键 词：克隆植物 沙埋干扰 种群拓殖 适应对策 植被恢复 

分 类 号：Q948.1[生物学—植物学]