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Distribution of humic compounds in mounds of some soil-feeding termite species of tropical rainforests: its influence on soil structure stability

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Summary

A comparison was made of some physicochemical characteristics of epigeous termitaries (nest walls and surrounding horizons) of four species of soil-feeding termites living in tropical rainforests. Our aim was to determine whether these species affect the different compounds involved in the structural stability of soil in a similar manner.

Our data support the general finding that the structural stability of soil is correlated with organic matter, cations and the relative proportion of mineral elements. Of these parameters, the content of organic matter is the most significant factor effecting the stability of termite building materials. Analysis of humic compound distribution revealed that fulvic and humic acids, owing to their electrochemical properties, are highly involved. Also, the organic matter in termitaries is more polymerized than that of humiferous control horizons, leading to FA/HA ratios close to 1.

The stability of nest walls and topsoils differs between the species. Generally, the speciesNoditermes lamanianus, Thoracotermes macrothorax andCubitermes fungifaber build nests that are enriched with organic matter and exchangeable cations, resulting in high structural stability. In contrast, materials worked byCrenetermes albotarsalis are not enriched with organic matter or cations and do not differ in stability from the control soils.

It is concluded that any generalization on the overall influence of soil-feeding termites on soil fertility might be misleading. Only species which enrich their materials with organic matter, especially stabilised humic acids, contribute to soil conservation and hence fertility. Once the termitary is dead, its organic matter is again available to the soil ecosystem.

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Garnier-Sillam, E., Harry, M. Distribution of humic compounds in mounds of some soil-feeding termite species of tropical rainforests: its influence on soil structure stability. Ins. Soc 42, 167–185 (1995). https://doi.org/10.1007/BF01242453

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