Science, Space and Technology News 2024
A typical fairy circle on the Kamberg, which the researchers investigated during the 2024 rainy season: The clumps of grass – up to 80 cm high – can be seen at the edge of the fairy circle. These clumps use the fallen rain first and have an immense competitive advantage due to their size. With their established roots at a depth of 20 cm to 30 cm, they are able to suck up the soil water in the fairy circle, leaving it dry and then bare of fresh grass.
This showed that the topsoil is very susceptible to drying out. During and after the rainy season, the soil moisture here is three to four times lower than the soil at a depth of around 20 centimeters. In addition, the topsoil is significantly drier within the fairy circle than outside during the period of grass growth after ample rainfall.
Getzin says: “This is the cause of the death of the new grass in the fairy circle. Continuous soil moisture measurements over several years support this conclusion. This is because the soil water in the fairy circle only decreases noticeably quickly with the strengthening and regrowth of the surrounding grass after rain.”According to the researchers, this testifies to the basic function of the fairy circles as water sources for the drought-stressed grass of the Namib.
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