Abstract
The input of zoogenic nitrogen to desert-type biocenoses is generally lower than the input of nitrogen with plant necromass (1.7 g N/m2), but zoogenic nitrogen is distributed extremely unevenly, and its input at sites near burrow openings, where animal excrements accumulate (about 1% of the total area), reaches 75 g N/m2; i.e., is 17 times higher. Zoogenic nitrogen coming with solid and liquid excreta has little effect on the mineral nitrogen content of soils in ground squirrel colonies during the dry period.
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