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Resource competition between 12 successional grassland species

Geerts, E. (1991) Resource competition between 12 successional grassland species. Master's Thesis / Essay, Biology.

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For twelve species from a successional series after cessation of fertilizer application with continued haymaking, competition against two competitors, Agrostis capillaris and Holcus lanatus, was studied at two nutrient levels using an additive design. The different pots were harvested three times with four weeks intervals. For the first harvest the outcome of competition was strongly related to the seed weight of the target species. Competition for light was observed to be important for the outcome of the competition in the second harvest. For the third harvest the nutrient levels had decreased to a low level, wich probably caused competition to be mainly for nutrients. The extinction coefficient and the lightintensity at the soil of a target species in controls without competition appeared to be good estimate for the outcome of the competition for light when also competition for nutrients was observed. Species from nutrient rich soils were observed to have higher root fractions than species from nutrient poor soils. The outcome of competition for nutrients was positive correlated to the fractions of total biomass in roots of the species. Therefore, early succesional species were both good light competitors and good nutrient competitors.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Biology
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:47
Last Modified: 15 Feb 2018 07:47

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