Park Heesoon, Kim Kiyoon, Walitang Denver I, Sayyed Riyaz, Sa Tongmin
Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju 28644, Republic of Korea.
Jujube Research Institute, Chungcheongbuk-do Agricultural Research and Extension Services, Boeun, Chungbuk 28902, Republic of Korea.
J Microbiol Biotechnol. 2024 Dec 28;34(12):2539-2546. doi: 10.4014/jmb.2406.06037. Epub 2024 Oct 30.
Organic fertilizer application in agricultural land is known to improve soil microbial processes, fertility, and yield. In particular, the changes in soil chemical composition due to multi-year application of organic fertilizers are thought to alter the microbial community. Here, the effects of organic fertilization with oil-cake amendments (OC) on soil bacterial diversity, community profile, and enzyme activity were evaluated and compared to those amended with chemical fertilizer (NPK). Diversity indices show that the application of organic fertilizer potentially increases microbial diversity as well as the number of different microbial groups. The ordination plot distinguished and clustered both treatments, showing the differential effects of soil chemical factors on the microbial communities in each treatment. Proteobacteria, Verrucomicrobia, and Bacteriodetes were significantly more abundant in OC-amended soil than in the NPK soil, indicating alterations in community structure, composition, and diversity, concurrent to the changes in the pH, Ca, and Mg contents of the soil. These shifts in bacterial community structure and composition, partially explained by differences in soil chemical factors, could be observed from the phylum to the genus level in NPK- and OC-amended soils. The OC soil contained a significantly higher abundance of predicted genes corresponding to enzymes related to biogeochemical cycling, decomposition, and plant growth promotion. Collectively, these results support the use of an unconventional organic fertilizer positively altering bacterial populations in jujube orchards. The application of an unconventional organic fertilizer improved microbial diversity and enhanced ecosystem functions related to biogeochemical cycles, mineralization, and plant growth promotion.
已知在农田中施用有机肥料可改善土壤微生物过程、肥力和产量。特别是，由于多年施用有机肥料导致的土壤化学成分变化被认为会改变微生物群落。在此，评估了施用含油饼改良剂（OC）的有机肥料对土壤细菌多样性、群落概况和酶活性的影响，并与施用化肥（NPK）的情况进行了比较。多样性指数表明，施用有机肥料可能会增加微生物多样性以及不同微生物群体的数量。排序图区分并聚类了两种处理，显示了土壤化学因素对每种处理中微生物群落的不同影响。与NPK土壤相比，OC改良土壤中的变形菌门、疣微菌门和拟杆菌门的丰度显著更高，这表明随着土壤pH值、钙和镁含量的变化，群落结构、组成和多样性发生了改变。在NPK和OC改良土壤中，从门到属水平都可以观察到细菌群落结构和组成的这些变化，部分原因是土壤化学因素的差异。OC土壤中与生物地球化学循环、分解和植物生长促进相关的酶的预测基因丰度显著更高。总体而言，这些结果支持使用非常规有机肥料可积极改变枣园细菌种群。施用非常规有机肥料改善了微生物多样性，并增强了与生物地球化学循环、矿化和植物生长促进相关的生态系统功能。
