Gas Exchanges in Soybean as Affected by Landfill Biogas Atmosphere
1999
Marchiol, L. | Mori, A. | Leita, L. | Zerbi, G.
A problem in the ecologicai restoration of closed landfills is the production of potentially toxic gases by decomposition of refuse that affects the root system and physiology of plants growing on these sites. The aim of the present study was to assess the effects induced by landfill biogas contamination on gas-exchanges of soybean [Glycine max (L.) Merr.]. Simulated landfill and control gases were supplied to soybean plants under laboratory conditions for 10 d. The composition of the simulated landfill gas used was: 16% O₂, 8% CO₂, 3% CH₄, and 73% N₂; a control gas was also tested (21% O₂, 0.035% CO₂, and 78% N₂). Photosynthesis and stomatal conductance were significantly affected by the gas treatment after 3 d; in the course of the experiment, biogas treatment progressively reduced Aₘₐₓ, in light-saturation curves. The fresh and dry weight, leaf area and leaf chlorophyll content were not affected by the treatment. A metabolic adaptation to the biogas in the roots of treated plants was related to the disappearance of a fraction of the protein pool.
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