Effects of Drought Stress on Photosynthetic Physiology in 4 Species of Ilex plants
Two years of Ilex(I.chinensis,I.rotunda,I.hylonoma var.glabra and I.cornuta)were used as experimental materials.Pot weighing and water control method were used.The photosynthetic characteristics in four species of Ilex.under different drought stress conditions were studied.The results showed that:(1)the chlorophyll content of I.chinensis decreased the most,the chlorophyll a/b increased the most,and the chlorophyll content of I.cornuta changed the most stable;(2)Under severe drought stress,the Pn value of I.chinensis was lower than that of other treatments and tree species,and the Pn value of I.rotunda was the most decreased,and I.cornuta was the most stable.(3)Under drought stress,chlorophyll content was significantly correlated with Pn,Gs and Tr,and chlorophyll a/b was negatively correlated with Pn,Gs and Tr.
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