Effects of So ilMo isture on the Ga s-exchange Parameters and Water UseEff ic iency of L on icera japon ica Thunb.
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1.
The Key Laboratory for Ecological Environment of Yellow RiverDelta, Binzhou University, Binzhou 256603, Shandong, China
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2.
Research Institute of Forestry, CAF, Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China
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3.
Forestry College, Shandong Agricultural University, Taian 271018, Shandong, China
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Received Date:
2007-11-06
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Abstract
Little is known about the op timum soil moisture and light intensities for the growth of L onicera japon icaThunb. Using CIRAS-2 portable photosynthesis system, the light responses of photosynthetic and physiologicalparameters of three years old leaves, such as net photosynthetic rate ( Pn ) , Transp iration rate ( Tr ) and water useefficiency (WUE) were thus measured under different soil moisture conditions. The results showed that Pn , Tr andWUE of leaves have critical response to the levels of soilmoisture and the variation of photosynthetic active radiation(PAR). In order to maintain the p lant growing normally and having higher Pn andWUE synchronously, the fittingmasswater content (Wm ) was about 121—206 g·kg-1 , and the fitting PAR was in the range of 600—1 600μmol·m-2 ·s-1. The“op timal high p roductivity and high efficiency water”of Wm was about 172 g·kg-1 , and the op timal PARwas in the range of 800—1 000μmol·m-2 ·s-1. Based on photosynthetic physiological parameters, the soil wateravailability and p roductivity of Lonicera japonica were classified and evaluated. The results showed that on Lonicerajaponica woodland, theWm less than 62 g·kg-1 belonged to“Non-available water”; in the range of 62～90 g·kg-1and more than 234 g·kg-1 , “Low p roductivity and low efficiencywater”; 121—145 g·kg-1 , “Middle p roductivityand middle efficiency water”; 172—206 g·kg-1 , “High p roductivity and high efficiency water”
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