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Sample sufficiency for epiedaphic fauna evaluation with Provid method/Suficiencia amostral para avaliacao da fauna epiedafica com o metodo Provid
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 environment...
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Published in: | Ciência florestal 2019-01, Vol.29 (1), p.444 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | Portuguese |
Online Access: | Get full text |
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Summary: | 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. Keywords: Sampling; Soil biology; Soil biodiversity O solo e habitado por milhares de organismos responsaveis por diversas funcoes e processos no ecossistema. Por apresentar uma grande sensibilidade as modificacoes do meio, a fauna do solo e considerada um bom bioindicador de qualidade do solo. Entretanto, uma amostragem inadequada pode inviabilizar sua utilizacao em estudos de impacto ambiental. Por isso, sao necessarios estudos que determinem a suficiencia amostral para avaliacao da fauna do solo. Esse trabalho teve como objetivo calcular a suficiencia amostral para o numero de grupos de individuos que compoe a fauna epiedafica em diferentes condicoes de uso do solo. Foram realizadas avaliacoes da fauna epiedafica nas condicoes de mata nativa, campo nativo pastejado e lavoura azevem/soja, em duas epocas distintas (inverno e verao). Avaliou-se a suficiencia amostral para o metodo de coleta (Provid) utilizado atraves do metodo analitico, com varios niveis de confiabilidade, e dos metodos nao parametricos de Chao 1 e Chao 2. Concluiu-se que o uso do numero minimo de 14 amostras pelo metodo Provid (n=14) para estudo da fauna epiedafica e suficiente para garantir, em qualquer epoca do ano e tipo de uso do solo, uma precisao de 10%, para estudos com levantamento de campo. Palavras-chave: Amostragem; Biologia do solo; Biodiversidade d |
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ISSN: | 1980-5098 |
DOI: | 10.5902/1980509831106 |