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Ecological effects of clay mining by Macrotermes termites
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Journal Article
Ecological effects of clay mining by Macrotermes termites
2021
Overview
Sealing of the soil surface during a rain event can, in many soils, have a large effect on infiltrability of water. Such sealing is usually temporary. Raindrop impact disperses clay particles which block the soil pores within the top millimetre of soil. This blockage can occur even in sandy soils with small amounts of dispersed clay. When the soil dries after a sealing event, whether in a clayey or sandy soil, the clay particles shrink, the thin seal breaks apart, and the seal is no longer easily discernible in the field. Sealing is usually ephemeral, occurring during rain events, as opposed to crusting which may be evident at the timescale of decades. Here, Mills and Medinski investigate the likelihood of the potentially negative effect of sealing being increased as a result of clay mining by termites and analyzed a range of physico-chemical properties of seven termite mounds, constructed by Macrotermes species, as well as adjacent topsoils and subsoils in northern Namibia.
