Photosynthesis and Water Metabolism of Alhagi sparsifolia Shap.in Different Geographical Populations
In order to investigate the ecological adaptation of Alhagi sparsifolia Shap.in different geographic populations,the relevant parameters,such as the net photosynthetic rate (Pn),transpiration rate (Tr),stomatal conductance (Gs),photosynthetically active radiation (PAR),air temperature (Ta),vapor pressure deficit (Vpd) and relative humidity (RH),were measured.The characteristics of photosynthesis and water metabolism were experimentally studied and compared in the Qira population and Fukang population by using LI-6400.The results revealed that the ways of adapting environment of plants growing in different geographic populations were different.The light saturation point (1 300 μmol · m-2 · s-1) and optimum temperature (35 ℃) for photosynthesis in the Qira population were all lower than those in the Fukang population (1 000 μmol · m-2 · s-1 and 31 ℃).Compared with the plants growing in the Fukang population,the plants growing in the Qira population needed the lower photosynthesis,lower transpiration and higher relative humidity to maintain their normal growth under the extremely arid environment.In the Qira population,the Pn (5.68 pmol · m-2 · s-1),Tr (2.71 mmol · m-2 · s-1) and Tr (10.35 mol · mol-1) were much lower than those (Pn:8.57 μmol · m-2 · s-1,Tr:6.11 mmol · m-2 · s-1 and light use efficiency:12.56 mol · mol-1) in the Qira population,but the water use efficiency (1.79 μmol · mmol-1) and Vpd (3.96 kPa) were obviously higher than those in the Fukang population.These revealed that the capability of adapting environment of the Qira population was higher than that of the Fukang population.
国家科技期刊平台
NSTL
万方数据
维普
