Abstract
This paper contains an analysis of taxonomic weed biodiversity in the cultivation of spring barley in the period of 1990-2004, grown in crop rotation after potato with a 25% share of this cereal (potato - spring barley - field pea - winter triticale) as well as in crop rotation with its 75% share (potato - spring barley - spring barley - spring barley) in which barley was grown once and twice after the same barley crop. No weed control was used in the present experiment. Every year in the spring (at full emergence of the cereal crop) and before harvest, the species composition and the numbers of individual weed species were determined, as well as weed biomass before harvest. On this basis, the taxonomic diversity and distinctness indices were calculated. Potato/barley crop rotation with a 25% share of this cereal and growing spring barley once and twice after the same barley crop did not differentiate taxonomic weed biodiversity. However, it was positively correlated with rainfall abundance during the growing season and negatively correlated with mean temperature. The taxonomic diversity indices were positively correlated with species richness and species diversity, whereas the taxonomic distinctness indices did not generally show any relationship with these measures. Spring barley grain yield did not depend on taxonomic biodiversity of weed communities.
Highlights
Among many dimensions of biodiversity, taxonomic diversity is mentioned (Silvert, 2003)
Weeds of 35 species identified in the spring barley crops over the 15-year study (Jastrzębska et al 2010) were classified hierarchically to 34 genera, 18 families, 15 orders, 3 classes, and 2 phyla
The barley stand in crop rotation did not affect the taxonomic diversity and distinctness of the weed communities (Table 1)
Summary
Among many dimensions of biodiversity, taxonomic diversity is mentioned (Silvert , 2003) It relates to the representation of lower-rank taxa inside higher-rank taxa and is generally expressed by the number of the former ones within the latter ones. Warwick and Clarke (1995) proposed measures of taxonomic diversity of assemblages of organisms which are relatively easy to calculate. Relative to taxonomic diversity, ignores quantitative interspecific relationships. These measures are used with success in the analysis of assemblage of organisms in aquatic ecosystems (Heino et al 2007), but less frequently – far – for assessment of plant communities (Gwali et al 2010)
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