The Influence of Environmental Factors on Aspergillus Niger Granite Weathering

Abstract

In order to explore the effects and influence of environmental factors on microbial restoration of waste rock, an efficient rock-weathering strain Aspergillus niger XF-1 was isolated from a granite face. Concentrations of SiO2 in nutrient solution at different temperatures, pH values, generation cycles, and vaccination quantities were measured using shake flask leaching and inductively coupled plasma optical emission spectrometer (ICP-OES) to analyze the grey correlation degree of weathering. The results reveal that the A. niger XF-1 strain can be used as a good fungal source for the restoration of degraded habitats in abandoned granite areas, and can also be used to promote the release of more Si elements in granite. Moreover, pH is the dominant factor affecting the weathering of granite by A. niger, followed by vaccination quantity and temperature, while generation cycle is the least important factor. The optimum temperature at which granite is weathered by A. niger was 28°C, the most appropriate pH value was 3, the most suitable generation was the fifth, and the optimum vaccination quantity was 10 7 (spore numbers mL -1 ).

Morphology of Oil Palm (Elaeis guineensis Jacq.) Seedlings Under Drought Stress with Oil Palm Shell Ash and Aspergillus niger treatment

“…Silicon (Si) in silicon dioxide (SiO2) is not available. Silicon decomposer microorganisms such as Aspergillus niger must be added to the soil solution, and Orthõsilicate acid is a form of silicon (Si) that is available and absorbed by plants [6]. Aspergillus niger can secrete oxalic acid, tartaric acid and citric acid to promote plant growth [7].…”

Preliminary Study on the Rock Weathering Effect of Bacillus Mucilaginosus

“…Hall believes that in the environment with biological existence, biological weathering rocks can play a leading role under certain conditions (Hall et al, 2005 affect the weathering of rocks and minerals and promote the formation of soil through growth and reproduction and the formation of biofilms (Ehrlich, 1999). Researches showed that the main microorganisms weathering the rock minerals were B. mucilaginosus (Zeng, 2016), Burkolderia solanacearum (Barker, 1998), Pseudomonas protegens (Wu et al, 2017a;Wu, 2016), Bacillus megatherium (Wu et al, 2017b), Aspergillus niger (Wu, , 2019, Rhizobium tropici (Wang et al, 2015), Penicillium oxalicum (Song et al, 2015) and so on. The weathering effects of these microorganisms on mineral rocks include direct dissolution and mechanical damage, and indirect chemical corrosion.…”