Modeled Dosage–Response Relationship on the Net Photosynthetic Rate for the Sensitivity to Acid Rain of 21 Plant Species

摘要

This study investigated the sensitivity of plant species to acid rain based on the modeled dosage–response relationship on the net photosynthetic rate (P _N) of 21 types of plant species, subjected to the exposure of simulated acid rain (SAR) for 5 times during a period of 50 days. Variable responses of P _N to SAR occurred depending on the type of plant. A majority (13 species) of the dosage–response relationship could be described by an S-shaped curve and be fitted with the Boltzmann model. Model fitting allowed quantitative evaluation of the dosage–response relationship and an accurate estimation of the EC₁₀, termed as the pH of the acid rain resulting in a P _N 10 % lower than the reference value. The top 9 species (Camellia sasanqua, Cinnamomum camphora, etc. EC₁₀ ≤ 3.0) are highly endurable to very acid rain. The rare, relict plant Metasequoia glyptostroboides was the most sensitive species (EC₁₀ = 5.1) recommended for protection.