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Response of Perennial Ryegrass to Free-Air CO₂ Enrichment (FACE) Is Related to the Dynamics of Sward Structure during Regrowth

Institute of Plant Sciences, Swiss Federal Institute of Technology (ETH), 8092 Zurich, Switzerland

View larger version (17K): [in a new window]   Fig. 2. Leaf area index (a) and transmission (%) of photosynthetically active radiation (PAR) to 4 cm above the soil surface (b) during regrowth of perennial ryegrass swards from 21 July to 15 Sept. 1997 at ambient (36 Pa) and elevated (60 Pa) pCO2 and after an infrequent (4 cuts yr-1) and frequent (8 cuts yr-1) cutting treatment before the beginning of the experiment (Error bars = SE, n = 6).

View larger version (18K): [in a new window]   Fig. 3. Total tiller number (a) and number of tillers shorter than 4 cm (b) during regrowth of perennial ryegrass swards from 21 July to 15 Sept. 1997 at ambient (36 Pa) and elevated (60 Pa) pCO2 and after an infrequent (4 cuts yr-1) and frequent (8 cuts yr-1) cutting treatment before the beginning of the experiment (Error bars = SE, n = 6).

View larger version (18K): [in a new window]   Fig. 1. Total DM (a) and yield (b) during regrowth of perennial ryegrass swards from 21 July to 15 Sept. 1997 at ambient (36 Pa) and elevated (60 Pa) pCO2 and after an infrequent (4 cuts yr-1) and frequent (8 cuts yr-1) cutting treatment before the beginning of the experiment. Necromass in (a) and (b) not included (Error bars = SE, n = 6).

View larger version (19K): [in a new window]   Fig. 4. Pseudostem DM (a) and root DM between 0 and 10 cm soil depth (b) during regrowth of perennial ryegrass swards from 21 July to 15 Sept. 1997 at ambient (36 Pa) and elevated (60 Pa) pCO2 and after an infrequent (4 cuts yr-1) and frequent (8 cuts yr-1) cutting treatment before the beginning of the experiment (Error bars = SE, n = 6).

View larger version (18K): [in a new window]   Fig. 5. Shoot necromass above cutting height (a) and below cutting height (b) during regrowth of perennial ryegrass swards from 21 July to 15 Sept. 1997 at ambient (36 Pa) and elevated (60 Pa) pCO2 and after an infrequent (4 cuts yr-1) and frequent (8 cuts yr-1) cutting treatment before the beginning of the experiment (Error bars = SE, n = 6).