Short-term effects of Kernza and alfalfa on microbial communities

IF 1.3 Q3 AGRONOMY
Ranjith P. Udawatta, Biyensa Gurmessa, Miguel Salceda Gonzalez, Sidath S. Mendis, Sarah T. Lovell
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Abstract

Continuous land disturbance could negatively impact microbial community, but perennial crops can potentially reverse this negativity. The objective of this study was to evaluate the effects of Kernza (Thinopyrum intermedium) and alfalfa (Medicago sativa L.) on soil microbial structure and stress condition using the phospholipid fatty acid profiling. The study was conducted at the Ross Jones Research Farm, University of Missouri and consisted of four treatments: Kernza fertilized, Kernza unfertilized, Kernza and alfalfa intercrop, and alfalfa monocrop with four replications. Treatments were established in September 2021 on 18.3 m × 18.3 m plots. Soils from 0- to 5-cm and 5- to 15-cm depths were sampled in September 2021 (before treatments were placed) and 2022 and analyzed for microbial communities. All microbial communities increased after 1 year with the perennial crops. Since differences were not significant among treatments in 2022, this may lead to positive impacts of perennial crops on microbial communities, irrespective of the crop species and management. Moreover, community structure modifications were also observed with the perennial crops, irrespective of the species and management, as evidenced with changes in bacterial community indices in 2022. While fungi/bacteria ratio increased, Gram-positive/Gram-negative bacteria ratio decreased in 2022, suggesting a reduction in microbial stress, which can be attributed to ecological functions of the perennial crops. The study showed improvements in soil microbial biomass and modifications in microbial community structure after 1 year of Kernza and alfalfa. As the system matures, relative benefits of management (fertilization and intercropping) and plant species may be realized.

Abstract Image

Kernza 和紫花苜蓿对微生物群落的短期影响
持续的土地扰动会对微生物群落产生负面影响,但多年生作物有可能扭转这种负面影响。本研究的目的是利用磷脂脂肪酸分析法,评估 Kernza(Thinopyrum intermedium)和紫花苜蓿(Medicago sativa L.)对土壤微生物结构和压力条件的影响。研究在密苏里大学罗斯-琼斯研究农场进行,包括四个处理:四种处理:施肥的 Kernza、未施肥的 Kernza、Kernza 和紫花苜蓿间作以及紫花苜蓿单作,四次重复。处理于 2021 年 9 月在 18.3 米 × 18.3 米的地块上建立。分别于 2021 年 9 月(种植处理前)和 2022 年 9 月对 0 至 5 厘米和 5 至 15 厘米深度的土壤进行采样,并对微生物群落进行分析。使用多年生作物一年后,所有微生物群落都有所增加。由于 2022 年各处理之间的差异并不显著,这可能导致多年生作物对微生物群落产生积极影响,与作物种类和管理无关。此外,无论作物种类和管理方式如何,多年生作物也会改变群落结构,2022 年细菌群落指数的变化就证明了这一点。2022 年,真菌/细菌比率上升,革兰氏阳性菌/革兰氏阴性菌比率下降,这表明微生物压力减少,这可能归因于多年生作物的生态功能。研究结果表明,Kernza 和紫花苜蓿种植 1 年后,土壤微生物生物量有所提高,微生物群落结构也有所改变。随着该系统的成熟,可能会实现管理(施肥和间作)和植物物种的相对效益。
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来源期刊
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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