Biomass Allocation and Soil Microbial Response to Drought Stress in Calamagrostis acutiflora
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 GN04 in bacteria,and Oomycota and Glomeromycota in fungi,were crucial in resistance to drought strain of Calamagrostis acutiflora.
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