Sample sufficiency for epiedaphic fauna evaluation with Provid method
DOI:
https://doi.org/10.5902/1980509831106Keywords:
Sampling, Soil biology, Soil biodiversityAbstract
The soil has thousands of organisms responsible for many functions and processes in the ecosystems. Due to presenting a great sensitivity to environmental modifications, the soil fauna is considered a good soil quality bio-indicator. However, inadequate sampling may not permit its use in environmental impact studies. Therefore, studies are required to indicate the sample sufficiency for evaluating the soil fauna. This study aimed to calculate the sample sufficiency for the number of groups of individuals that composes the epiedaphic fauna in different soil use conditions. Evaluations of the epiedaphic fauna were carried out in native forest, native pasture and ryegrass/soybean farming, in the winter and the summer. The sample sufficiency was evaluated for the Provid method through analytical methods, with many levels of reliability, and of the non-parametric methods of Chao 1 and Chao 2. It was concluded the use of the minimum number of 14 samples by the Provid method (n = 14) for the study of epiedaphic fauna is sufficient to ensure, at any time of the year and type of use of the soil, a precision of 10% for field survey studies.Downloads
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