Blum, OB/ Nash, TH, III/ Gebauer, R 1989: The effect of nitrate on CO2 exchange in the epiphytic lichens Ramalina menziesii Tayl. and Pseudocyphellaria anthraspis (Ach.) Magn. from central California. - In: Noble, RD/Martin, JL/Jensen, KF (eds.): Air Pollution Effects on Vegetation Including Forest Ecosystems. . USDA, Forest Service, pp. 181-185. [RLL List # / Rec.# 2041] Keywords: AIR POLLUTION/ CO2 EXCHANGE/ NITRATE
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