Abstract: We evaluated shoot and root biomass yields of four native grasses of NSW and an introduce species in order to establish if differences in shoot- and root-biomass yields as well as root:shoot ratios existed among the species. We also explored the potential to predict root biomass from shoot biomass of each species. The species were grown in trays with conical holes of volume 180 cm3 uniformly packed with sand (0.1 – 0.8 mm grain size) amended with potting mix (50/50 v/v) in a glasshouse experiment. The trays were arranged in a replicated randomised complete block design. After eight weeks, the shoots and respective roots of randomly selected plants per species were harvested and oven-dried for biomass determination. Data were subjected to ANOVA in R after square root transformation normalised the data. We found remarkable differences in shoot biomass, root biomass and root/shoot ratios among the species. Microlaena stipoides gave strongest positive linear relationship (R2 = 0.8) between root biomass and shoot yield while Austrodanthonia spp. showed no significant relationship between the two variables. These interrelationships must be investigated under field conditions before root biomass can be meaningfully modeled from known shoot biomass yields, taking into consideration the implications of these differences for carbon storage.
Olupot, G., Barnes, P., Daniel, H., Lockwood, P., McHenry, M., McLeod, M., Kristiansen, P., King, K., 2010, Can root biomass of grasses in NSW be predicted from shoot biomass yields?, Conference Paper, viewed 09 August 2022, https://www.nintione.com.au/?p=3585.