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Studies On The Photosynthetic Ecophysiology And Adaptability To Stress Factors In The Dry Season In The Dry-hot Valley, The Upper Reaches Of The Yangtse River

Posted on:2007-09-29Degree:MasterType:Thesis
Country:ChinaCandidate:J H QinFull Text:PDF
GTID:2120360185494473Subject:Environmental Science
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The dry and hot valleys are characterized by fragile ecological environment and more susceptible to degradation under the natural disturbance and anthropogenic influence. Revegetation is one of the most effective ways to restore heavily degraded ecological system, which depends on screening out the right plant species with adaptability to the stress of high radiation, high temperature, drought, and soil moisture capacity during the dry season in these areas. On-site studies on the photosynthesis ecophysiology of introduced and native plant species for reforestation could provide theoritcal framework and practical guidance for the deteriorated ecosystem restoration, the ecological barrier zones construction, and soil erosion control in the up reaches of the Yangtse River. In addition, biological invasion also endangers ecological safety of the dry valleys. Therefore, studies on the photosynthesis characteristics of invasive species such as Eupatorium adenophorum could be helpful to bring forward some countermeasures for biological invasion control.The onsite monitoring of diurnal variations of photosynthesis characteristic parameters of six woody species, i.e., Eucalyptus camaldulensis, Psidium guajava, Sophara viciifolia, Cinnamomum camphora, Morus alba, Leucaena leucocephala, and a invasion species, Eupatorium adenophorum, have been carried out in dry season in the dry-hot valley of Ningnan County, Sichuan Province. The responses of these species to high irradiance and high temperature have been analyzed, and their possible adaptation mechanisms to external stress conditions have also been discussed in this thesis. Additionally, the dispersal tendency in these areas of E. adenophorum has also been discussed at the aspects of its adaptabilities to the environmental conditions.
Keywords/Search Tags:Dry and Hot Valley, photosynthesis, ecophysiology, revegetation, stress physiology, Eucalyptus camaldulensis
PDF Full Text Request
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