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《Journal of Beijing Normal University(Natural Science)》 2009-02
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YUAN Sufen LI Wei TANG Haiping(State Key Laboratory of Earth Surface Processes and Resource Ecology;College of Resources Science and Technology:Beijing Normal University,100875,Beijing,China)  
s Desert spring ephemerals as pioneer plants play important roles in community succession,biodiversity maintenance,dune stabilization in desert ecosystems.Net photosynthetic rate,transpiration rate,water use efficiency,and photosynthetic response to photosynthesis-active radiation and CO2 concentration in Lappula semigabra in The Dzungaria Desert were studied with a LI-6400 portable photosynthetic system.Data showed that net photosynthetic rate in Lappula semiglabra had two daily peaks in the middle and later growing seasons,but transpiration rate had only one peak,therefore Lappula semigabra had no transpiration midday depression.Net photosynthesis rate in middle growing season was twice that in late growing season.Apparent quantum yield and carboxylation efficiency in leaves were 0.0691 and 0.0541,respectively.Such values are higher than found in other plants in warm temperate zone,therefore Lappula semigabra showed higher utilization rate at lower light radiation and lower CO2 concentration.
【Fund】: 国家自然科学基金重点资助项目(40435014)
【CateGory Index】: Q945
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