| Biology and Soil |
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| Response of Chlorophyll Fluorescence of Tamarix taklamakanensis to Sandstorm |
| HAN Wei1,2, CAO Ling3, HIMIT Yimit4*, XU Xin-wen5 |
1.College of Resources and Environment Sciences, Xinjiang University, Xinjiang, 830046, China;
2.Ministry of Education Key Laboratory of Oasis Ecology, Xinjiang University, Xinjiang, 830046, China;
3.College of Mathematics and Physics Sciences, Xinjiang Agricultural University, Xinjiang, 830052, China;
4.Xinjiang Normal University, Xinjiang, 830054, China;
5.Institute of Ecology and Geography, Chinese Academy of Sciences, Xinjiang, 830011, China |
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Abstract In recent years, more and more sandstorms occurred in Taklimakan Desert in Northwest China, which may seriously affect photosynthetic performance of Tamarix taklamakanensiss, one of the main shelterbelt plants in Tarim Desert Highway shelterbelt. To confirm the impact of sandstorm to T. taklamakanensiss, diurnal variations of chlorophyll fluorescence parameters were investigated by PAM-2100 (Walz, German) in August, 2009 and by which to determine the energy utilization changes of T. taklamakanensiss under normal and sandstorm weather conditions. By comparison of the parameters before and after a moderate sandstorm, the energy dissipation proportion, Y(Ⅱ)∶Y(NO)∶Y(NPQ)=40%∶20%∶40% under a normal weather condition, turned to 65%:15%:20% in the second day after the moderate sandstorm. The increase of energy absorbed enhanced the photosynthetic capacity on the second day after a moderate sandstorm. The climb of dissipation energy by NPQ mechanism protected photochemical apparatus. Y(NO) decreased slightly, which reflected the fraction of energy that was passively dissipated in form of heat and fluorescence, mainly due to closed PS Ⅱ reaction centers. Physical scathing brings no damages to the photosynthetic apparatus of T. taklamakanensiss. Decreasing energy absorption, keeping higher energy dissipation fraction and stabilizing structural dissipation proportion were main response of T. taklamakanensiss, which was a result of long living adaptation to atrocious weather environment in the Taklimakan Desert.
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Received: 09 February 2011
Published: 20 January 2012
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2012, Vol. 32 
