Studies on Photosynthetic Characteristics of South-and North-typed Populus deltoides Younglings
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Abstract
The results showed that: the curves of diurna1 variations of net photosynthetic rate for South-typed Populus deltoides had one single peak curve in May and September, the peak values were respectively 15.79 and 14.13 μmol·m-2·s-1, while it showed two-peak curve in July, the biggest value was 22.03 μmol·m-2·s-1. North-typed P. deltoides showed a two-peak curve in the three months, the biggest value was respectively 13.46, 18.08, 12.91 μmol·m-2·s-1 and North-typed P. deltoides had the phenomenon of "photosynthetic midday depression"; while South-typed had the phenomenon only in July. The photosynthetic characteristics of North- and South-type P.deltoides in different months had a certain similarity, both was summer(July)> spring(May)> autumn(September), In October, the net photosynthetic rate of South-typed P. deltoides was 12.7 μmol·m-2·s-1, while the North-typed P. deltoides had already no leaves left. By using the methods of stepwise multiple regression, partial correlation and path analysis, it analyzed photosynthetic active radiation, air temperature, air relative humidity, air CO2 concentration and net photosynthetic rate of the south and north-type Populus deltoides respectively in May, July and September. PARo is the most important ecological factor influencing the net photosynthetic rate of P. deltoides.
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