拂子茅生物量分配及土壤微生物对干旱胁迫的响应  

Biomass Allocation and Soil Microbial Response to Drought Stress in Calamagrostis acutiflora

作　　者：刘玮 冯康安 朱宝才[2] LIU Wei;FENG Kang′an;ZHU Baocai(Department of Forestry,Shanxi Forestry Vocational Technical College,Taiyuan,Shanxi 030009;College of Forestry,Shanxi Agricultural University,Taiyuan,Shanxi 030031)

机构地区：[1]山西林业职业技术学院园林系,山西太原030009 [2]山西农业大学林学院,山西太原030031

出　　处：《北方园艺》2024年第11期79-87,共9页Northern Horticulture

基　　金：山西省林业厅科技创新资助项目(lycx201944)。

摘　　要：以拂子茅(Calamagrostis acutiflora)为试材,采用盆栽控水法,研究了不同程度干旱胁迫对拂子茅生物量分配以及土壤微生物的影响,以期为干旱地区拂子茅的培育和种植提供参考依据。结果表明:地上生物量和地下生物量均随着干旱胁迫程度的加重表现出先增加后降低的趋势,分别在轻度干旱和中度干旱达到峰值。根冠比和细根生物量占比随着干旱胁迫程度的加深而持续增加,而粗根生物量占比降低。高通量测序的结果表明,土壤微生物多样性几乎不受干旱胁迫的影响,而微生物群落组成受干旱胁迫的影响较大。考虑到细根生物量和根冠较能反映植物水分吸收和抵抗逆境的能力,认为细菌中的WS3、SAR406、变形菌门(Proteobacteria)和GN04以及真菌中的卵菌门(Oomycota)和球囊菌门(Glomeromycota)在协助拂子茅抵抗干旱胁迫方面起重要的作用。Taking Calamagrostis acutiflora as the test material and using potted water control method,the effects of different degrees of drought stress on biomass allocation and soil microorganisms of Calamagrostis acutiflora were studied,in order to provide reference for the cultivation and planting of Calamagrostis acutiflora in arid areas.The results showed that the aboveground and underground biomass increased first and then decreased with increasing drought stress,peaking at mild and severe levels,respectively.The root-crown ratio and the proportion of fine root biomass steadily increased with increasing drought stress,while the percentage of coarse root biomass decreased.High-throughput sequencing findings indicated that there was minimal impact on soil microbial diversity due to drought stress,but there was a greater impact on microbial community composition.Since the comparisons of fine root biomass and root-crown ratio provided insights into plant water absorption and resilience to stress,we proposed that several microorganisms,such as WS3,SAR406,Proteobacteria,and GN04in bacteria,and Oomycota and Glomeromycota in fungi,were crucial in resistance to drought strain of Calamagrostis acutiflora.

关 键 词：拂子茅 干旱胁迫 生物量 微生物 

分 类 号：S688.4[农业科学—观赏园艺]