Effect of CO2 enrichment on some morphological traits, dry matter production and allocation of tall fescue (Festuca arundinacea cv. Nanryo)
1999
Kobayashi, S. (Hokkaido Univ., Sapporo (Japan)) | Yoshida, K. | Nakashima, H.
In order to investigate effects of CO2 enrichment on growth of tall fescue, the plants were grown under doubled and ambient CO2 concentration in about two months using open top chambers, and some morphological traits (tiller number, leaf area index and leaf weight), dry matter allocation and whole plant biomass were examined. Results obtained were as follows: 1. Relationships between whole plant biomass and morphological traits, shoot biomass and root biomass, total root biomass and root biomass in two soil strata were not changed by CO2 enrichment. This indicated CO2 enrichment could not have direct effects on morphological traits, dry matter allocation and root system of tall fescue. 2. Whole plant biomass increased to some extent for a while from the start of CO2 enrichment. However, its increase of biomass by CO2 enrichment disappeared at the end of the experiment. The disappearance was considered to be caused by deterioration of mineral nutrition and light environment in progress of growth. 3. By plotting plant biomass of ambient CO2 against one of doubled CO2, a clear quadratic function (R(2) = 0.99) was obtained as a good index of growth response (biomass increase) of tall fescue to CO2 enrichment
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