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Interobserver error in grassland vegetation surveys:sources and implications

Journal of Plant Ecology 2020年第5期13卷 641-648页

作者： Lloyd W.Morrison Sherry A.Leis Michael D.DeBacker Department of Biology Missouri State University901 S.National AvenueSpringfieldMO 65897USA National Park Service Heartland Inventory and Monitoring ProgramWilson’s Creek National Battlefield6424 W.Farm Road 182RepublicMO 65738USA

Aims Observer error is an unavoidable aspect of vegetation surveys involving human *** quantified four components of interobserver error associated with long-term monitoring of prairie vegetation:overlooking error,misidentification error,cautious error and estimation *** also evaluated the association of plot size with pseudoturnover due to observer error,and how documented pseudochanges in species composition and abundance compared with recorded changes in the vegetation over a 4-year *** This study was conducted at Tallgrass Prairie National Preserve,*** sites contained 10 plots;each plot consisted of a series of four nested frames(0.01,0.1,1 and 10 m^(2)).The herbaceous species present were recorded in each of the nested frames,and foliar cover was visually estimated within seven cover categories at the 10 m^(2)spatial scale *** hundred total plots(30 sites)were surveyed,and 28 plots selected at random were resurveyed to assess observer *** surveyors worked in teams of *** Findings At the 10 m^(2)spatial scale,pseudoturnover resulting from overlooking error averaged 18.6%,compared with 1.4%resulting from misidentification error and 0.6%resulting from cautious *** resulting from overlooking error increased as plot size decreased,although relocation error likely played a *** change in species composition over a 4-year interval(excluding potential misidentification error and cautious error)was 30.7%,which encompassed both pseudoturnover due to overlooking error and actual *** a documented overlooking error rate of 18.6%,this suggests the actual change for the 4-year period was only 12.1%.For estimation error,26.2%of the time a different cover class was *** the 4-year interval,46.9%of all records revealed different cover classes,suggesting that 56%of the records of change in cover between the two time periods were due to observer error.

关键词： cautious error estimation error misidentification error observer error overlooking error pseudoturnover

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