■本文试图研究各种施肥方法对玉米种植毛乌素沙地混合土壤根际土壤特性和有机碳矿化的影响,目的是为低碳农业和优质农田的发展奠定基础。
■研究的重点是1:2比例的软岩和砂复合土,它包括四种处理:不受精(CK),只有化学肥料(CF),仅施用牛粪(MF),和只有油渣应用(DF)。
■研究结果表明,有机肥的使用大大提高了玉米根际土壤中的养分含量和酶活性。此外,它对土壤团聚体直径和稳定性都有显著影响。具体来说,DF处理导致土壤团聚体直径和稳定性均显着增加。玉米根际土壤中有机碳的矿化速率可以分为两个不同的阶段:快速的初始下降,然后是缓慢的释放。潜伏期结束时,MF中有机碳的累积矿化,DF,CF处理显着增加了119.87%,57.57%,和24.15%,分别,与CK治疗相比。此外,DF和MF处理的矿化速率常数经历了大幅上升,增量分别为23.52%和45.97%,分别,与CK治疗相比。细菌门放线菌,变形杆菌,氯氟菌,酸杆菌,根际土壤细菌群落中占主导地位。特定属,例如诺卡氏菌和鞘氨醇单胞菌,与有机碳矿化显着相关。施用不同的有机肥可以改善土壤物理,化学和生物学特性,促进玉米根际土壤有机碳的矿化过程。
■值得注意的是,DF治疗表现出最有利的结果,提高玉米根际土壤的整体质量,同时产生最小的单位有机碳损失。这些发现对优化田间管理实践和提高土壤质量具有重要意义。
UNASSIGNED: This article endeavors to investigate the influence of various fertilization methods on the characteristics of rhizosphere soil and organic carbon mineralization in the mixed soil of Mu Us Sandy land under maize cultivation, with the objective of laying the groundwork for low-carbon agriculture and the development of high-quality farmland.
UNASSIGNED: The research focuses on soft rock and sand composite soil with a 1:2 ratio, and it comprises four treatments: no fertilization (CK), only chemical fertilization (CF), only cattle manure application (MF), and only oil residue application (DF).
UNASSIGNED: The findings revealed that the use of organic fertilizer substantially elevated nutrient content and enzyme activity in the maize rhizosphere soil. Furthermore, it had a notable influence on both soil aggregate diameter and stability. Specifically, the DF treatment led to a significant increase in both soil aggregate diameter and stability. The mineralization rate of organic carbon in the maize rhizosphere soil could be categorized into two distinct phases: a rapid initial decline followed by a slower release. By the end of the incubation period, the cumulative mineralization of organic carbon in the MF, DF, and CF treatments showed a significant increase of 119.87%, 57.57%, and 24.15%, respectively, in comparison to the CK treatment. Additionally, the mineralization rate constants of the DF and MF treatments experienced a substantial rise, with increments of 23.52% and 45.97%, respectively, when contrasted with the CK treatment. The bacterial phyla Actinobacteriota, Proteobacteria, Chloroflexi, Acidobacteriota, and Firmicutes were dominant in the rhizosphere soil bacterial community. Specific genera such as Nocardioides and Sphingomonas showed significant correlations with organic carbon mineralization. The application of different organic fertilizer can improve soil physical, chemical and biological properties, and promote the mineralization process of organic carbon in maize rhizosphere soil.
UNASSIGNED: Notably, the DF treatment exhibited the most favorable outcome, improving the overall quality of maize rhizosphere soil while incurring a minimal loss of unit organic carbon. These findings hold significant implications for optimizing field management practices and augmenting soil quality.