Effects of Soil Water Condition on Photosynthetic Characteristics of Pterocarya stenoptera C.DC.Seedlings
In an experiment reported in this paper, Pterocarya stenoptera C.DC.seedlings were subjected to 4 water condition treatments, i.e.control (CK, normal water condition), T1 (light drought stress), T2 (wet soil) and T3 (soil submersion), and their photosynthetic responses were investigated.The results showed that different soil water conditions influenced, to different extents, the net photosynthetic rate (Pn), stomatal conductance (Gs), water use efficiency (WUE) and photosynthetic pigment content of the P.stenoptera seedlings.In the early period of stress (25d) of T3, these indices changed little and only Pn decreased by 25.4% compared with the control.Pn decreased by 60.3%, 47.8% and 28.1% in T1, T3 and T2, respectively, after 50 days and appeared relatively stable thereafter.Tr and Gs showed a similar change trend in various treatments.T2 and T3 had no significant difference from the control in the two in-dices, while T1 was significantly lower than it.T1 kept high water use efficiency against the drought stress.T3 had the lowest content of photosynthetic pigment, while T1 did not differ from CK in the con-tent of chlorophylls and carotenoids as a whole.The ratio of chlorophylls to carotenoids ranged from 4.475 to 6.920 and the ratio of chlorophylls a to b varied from 2.518 to 3.216 in these treatments.The above re-sults proved that P.stenoptera, seedlings are fairly tolerant to both waterlogging and drought stress and that P.stenoptera, can be a candidate species in the construction of the protection vegetation system of the Three Gorges Reservoir Region.
soil water conditionPterocarya stenoptera C.DC.seedlingphotosynthetic characteristicsphotosynthetic pigment
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万方数据
维普
