Identification of Functional Microbes and Soil Stable Carbon in the Rhizosphere of Horticultural Plants in Land Affected by Cold Lava of Mount Marapi, West Sumatra

Abstract

The Marapi area is mostly cultivated by the community as horticultural agricultural land, horticultural plants will be very vulnerable to being able to survive in these conditions. Research related to the identification of functional microbes that in this case greatly affect the availability of plant nutrients and carbon stability in the provision of nutrients in the root environment of horticultural plants will be a concern in the short term. The purpose of this study was to identify functional microbes that still survive in extreme conditions of cold lava floods and the stability of soil carbon in the rhizosphere of horticultural plants in the area affected by the Marapi cold lava flood in West Sumatra. Changes in the physicochemical and biological properties of soil in the rhizosphere of horticultural plants that have been identified through several physical, chemical and biological parameters of the soil. The lower slopes affected by the cold lava flood of Mount Marapi are the land with the worst damage conditions. The soil volume weight increases and the total pore space of the soil decreases with the impact of the land by the cold lava flood of Mount Marapi. The water content, organic C and stable C of the soil decrease with decreasing slope position. The population of microorganisms; the population of bacteria, fungi and phosphate-solubilizing bacteria also decreases with decreasing slope position. It is recommended to revitalize the lands for horticultural plants due to the damage of the cold lava flood of Marapi.