Research On The Photoprotective Characteristics Of Ammopiptanthus Mongolicus (Maxim.) Cheng F.

This paper took the Ammopiptanthus mongolicus(Maxim.)Cheng f. of Dengkou Ulan Buh Desert area as the study object, by measuring the indicator of Photosynthetic rate, chlorophyll fluorescence parameters, light breathing, heat dissipation, this study researched photoprotective characteristic changes under different light intensities and glare treatment and water saturation deficit Characteristics of light damage to the defense, research results are as follows:(1)Indicator of different light intensities and light treatment were tested under y=a+b (1-e-kx)(x is the light intensity, y is measured indicators), measured under the water saturation deficit indicators was y=ae-bx k (x saturated deficit, y for the determination indicator).(2) Light response curve at different light intensities measured indicators drawn according to the test species total photosynthetic rate of7-9month, PS Ⅱ actual photochemical quantum yield, non-photochemical quenching were higher than4-6months, showed maturity light strong adaptability in the growing season; photorespiration energy of the most prominent role in July, but weak sensitivity to light intensity.(3) Under high linght treatment, processing light1,2,3are from low to high degree of inhibition under three kinds of different treatments,the actual quantum yield and total photosynthetic rate of PS Ⅱ were lower than the low light treatment,respiratory rate and light non-photochemical quenching were higher than the low light treatment. PS Ⅱ actual photochemical quantum yield decline:8.16%.13.18%.17.96%; total photosynthetic rate decreased amplitude:2.87%.24.06%.28.70%; photorespiration rate rise:0.64%.51.19%.28.40%; Non-photochemical quenching rise:0.35%.23.55%.24.22%.(4) Under water saturation deficit conditions, the testing species in7-8months by reducing the electron transfer photosynthetic carbon assimilation, reducing the total photosynthetic rate, and enhance the adaptability to stress. Higher in July and August and NPQ photorespiration initial water stress, indicating improved adaptability to water deficit and heat dissipation through photorespiration way.