Comparison of Photosynthetic Characteristics of Three Provenances of Urtica dioica
3个种源异株荨麻光合特性的比较

The curves of diurnal variation of net photosynthetic rate(Pn) and the response of photosynthesis rate to light intensity and CO2 concentration in 3 provenances of Urtica dioica L.were measured with Li-6400.The curves of diurnal variation of net photosynthetic rate(Pn) in leaves of Urtica dioica L.showed two peaks,occurring at 9:00 and 15:00 respectively.Midday depression of Pn was found in leaves of Urtica dioica L.The depression of Pn was mainly induced by non-stomatal factors.The Pn values of the Urtica ...