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11	Vnímání heterogenity půd rostlinami v polopřirozených podmínkách / Plant perception of soil heterogeneity in the field Hrouda, Adam January 2021 (has links) Nutrients are usually patchily distributed in natural soils. Plants are often able to respond to nutrient heterogeneity in artificial conditions by active plastic changes of root system morphology. The occurrence or magnitude of a foraging response can be altered by the presence of competition. However, it is unclear to what extent root foraging takes place in the field. I conducted a field experiment in order to determine the effect of an artificial nutrient patch on fine belowground biomass of (a) an established community and (b) model plants. The study array consisted of a grid of 30×30 cm plots with model plants located in the centre. Half of the plots contained the artificial patch located 5.5 cm from the model plant. Fertilizer patch treatment did not increase mean plot fine underground biomass. Instead, fine underground biomass was higher in places of greater soil moisture estimated from mean plot EIVs. Neither total model plant root biomass nor proportion of roots in the enriched quarter increased in the fertilizer treatment. Competition was probably higher in fertilized than in control plots judging by a 2-fold increase in death rate of model plants. However, greater proportion of model plants flowered in the treatment plots. Possible causes include a plastic response to the patch as well...
12	Shade trees in cacao agroforestry systems: influence on roots and net primary production Abou Rajab, Yasmin Joana Monna 10 December 2015 (has links) No description available. 570 Cacao Carbon sequestration Vertical root segregation Biodiversity Water uptake Fine root biomass Fine root necromass Fine root production Aboveground biomass Belowground biomass Shade trees Net primary production Fine root turnover Agroforestry Carbon pools Cacao bean yield Hydraulic conductivity Wood density Foliar nitrogen Vessel diameter Deuterium Biologie (PPN619462639)

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Vnímání heterogenity půd rostlinami v polopřirozených podmínkách / Plant perception of soil heterogeneity in the field

Shade trees in cacao agroforestry systems: influence on roots and net primary production