The effects of the short-term application of Ascophyllum nodosum-fermented seaweed fertilizer on the bacterial community, soil nitrogen contents, and plant growth in maize rhizosphere soil were evaluated. The changes in the bacterial community composition and nitrogen contents including those of total nitrogen (TN), nitrate nitrogen (NO3--N) and ammonium nitrogen (NH4+-N) in rhizosphere soils in response to treatment with seaweed fertilizer were determined. Furthermore, soil enzymatic activity and crop biomass were analyzed. The relative abundance of the dominant phyla varied regularly with fertilization, and bacterial α-diversity was apparently influenced by seaweed fertilizer amendment. The TN contents of all soil samples decreased gradually, and the NO3--N and NH4+-N contents of the soils treated with seaweed fertilizer were much higher than those of the control soils. Similarly, the enzymatic activities of dehydrogenase, nitrite reductase, urease, and cellulase in the soil were significantly increased on day 3, day 8, and day 13 after the application of seaweed fertilizer to the maize rhizosphere soil. However, there was no difference in the activity of soil sucrase between the treatment group and the control group. In this study, the growth of maize seedlings was confirmed to be greatly promoted by the utilization of seaweed fertilizer. These results deepen our understanding of plant-microbe interactions in agroecosystems and should benefit the wide use of seaweed fertilizer in sustainable agricultural production.

中文翻译：

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短期施用海藻肥对玉米根际土壤细菌多样性和群落结构、土壤氮含量及植物生长的影响。


评价短期施用泡叶藻发酵海藻肥对玉米根际土壤细菌群落、土壤氮含量和植物生长的影响。测定了根际土壤中细菌群落组成和氮含量的变化，包括总氮（TN）、硝态氮（NO3--N）和铵态氮（NH4+-N）对海藻肥处理的响应。此外，还分析了土壤酶活性和作物生物量。优势门的相对丰度随施肥而有规律地变化，并且细菌α多样性明显受到海藻肥料改良的影响。各土样的TN含量均逐渐下降，且海藻肥处理土壤的NO3--N和NH4+-N含量均远高于对照土壤。同样，玉米根际土壤施用海藻肥后第3天、第8天和第13天土壤中脱氢酶、亚硝酸还原酶、脲酶和纤维素酶的酶活性显着增加。然而，处理组和对照组之间土壤蔗糖酶活性没有差异。本研究证实，使用海藻肥可极大促进玉米幼苗的生长。这些结果加深了我们对农业生态系统中植物与微生物相互作用的理解，并有利于海藻肥料在可持续农业生产中的广泛使用。