Identification of macrofauna on various volcanic ash thickness and different vegetation in andisol affected by Sinabung eruption

Abstract

Mount Sinabung eruption caused the soil covered by volcanic ash with various thickness. Changes in soil conditions will affect population and diversities in the soil. The research aims to identify soil macro-fauna on andisol in Karo County with various thickness of volcanic ash of Mount Sinabung with different vegetation after 5 years of eruption. The Plots were placed onto eight locations, I = processed land (0 cm) grass vegetation, II = uncovered by ash land (0 cm) coffee vegetation, III = covered by thin layer of ash land (≤2 cm) grass vegetation, IV = covered by thin layer of ash land (≤2 cm) coffee vegetation, V = covered by medium layer of ash land (2-5 cm) grass vegetation, VI = covered by medium layer of ash land (2-5 cm) coffee vegetation, VII = exposed by thick ash land (≥5 cm) grass vegetation, VIII = exposed by thick ash land (≥5 cm) coffee vegetation. Sampling was done by method Pitfall Trap, Square Monolith, and Hand Sorting. The result shows that the change of soil will affect soil macro-fauna - based on macro-fauna identification results, found 3 phylum(s), 7 class(es), 12 ordo(s), 18 family(ies), and 20 species.

Soil macrofauna diversity in andisol after eight years of Mount Sinabung eruption in Sumatra, Indonesia

“…Organic matter is a source of food for organisms in the soil. The research results of Munawaroh et al (2020) stated that the lower the soil C organic, then the fewer macrofauna species can live.…”

Diversity of non-symbiotic nitrogen-fixing bacteria and their potential in andisols affected by the eruption of Mount Sinabung, North Sumatra, Indonesia

“…Depending on the thickness levels, ash deposited causes disturbance in soil aeration, which affects microorganisms in the soil. The thicker the volcanic ash, the fewer microorganisms in the soil (Pakolo et al 2018;Sarah et al 2015;Munawaroh et al 2020;Qadaryanty et al 2020;Zebua et al 2020) The pH of soil greatly influences the growth of soil microorganisms. Fungi can tolerate and survive a soil pH range of 4-6.5, while bacteria prefer a soil pH of 6 to 7 (Hanafiah et al 2009).…”