| Ecological responses of chlorophyll fluorescence characteristics of Populus euphratica and Populus pruinosa to groundwater level in upper reaches of Tarim River |
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| DOI：10.7606/j.issn.1000-7601.2013.03.27 |
| Key Words: Populus euphratica Poulus pruinosa chlorophyll fluorescence parameters groundwater level ecological adaptation mechanism |
| Author Name | Affiliation | | WANG Haizhen | College of Plant Science, Tarim University, Alar, Xinjiang
843300, China
Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Alar, Xinjiang 843300, China | | CHEN Jiali | College of Plant Science, Tarim University, Alar, Xinjiang
843300, China | | HAN Lu | College of Plant Science, Tarim University, Alar, Xinjiang
843300, China
Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Alar, Xinjiang 843300, China |
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| Abstract: |
| In attempt to explore the correlation between Chlorophyll fluorescence characteristics of Populus euphratica
and Populus pruinosa to groundwater level, Chlorophyll fluorescence characteristics and PS Ⅱ photosynthetic activities of Populus euphratica and Poulus pruinosa
under different groundwater depths in the upper reaches of Tarim River were measured with a portable fluorometer. The results showed that photosynthetic electron transportation rate(ETR), actual photoehemical effieiency of PSⅡ in the light(ΦPSⅡ),photochemistry quenching(qP), photochemieal rate(PCR), maxi-
mal fluorescence(Fm)and potential photosynthetic activity(Fv/Fo)of two tree species were decreased, while non-pho-tochemistry quenching(NPQ), yield for dissipation by down-regulation(YNPQ), yield of other non-photochemical losses(YNO), relative limitation of photosynthesis(PED), and deviation from full balance between PS I and PSⅡ(β/α-1) were increased remarkably with decreasing groundwater level. Their
maximal photochemical efficiencies of PSⅡ(Fv/Fm)were maintained at an optimal value(>0.815). The results showed the PSⅡ photosynthetic activity, photochemical efficiency
and photochemical reaction energy of two tree species declined with the increasing groundwater depth, whereas the ability to withstand high light intensity were decreased, which would result in greater excess of excited energy and increasing the potential risk of light injury. However, two species employed the
stress-resistance and self-regulation mechanism to enhance heat dissipation and alleviate injury on PSⅡ. Thus, two species could keep higher photosynthetic efficiiency in desert and environment. The comparison of chlorophyll fluorescence parameters of P. euphratica and P. pruinosa indicated that, at different groundwater depths, P. euphratica had higher PSⅡ photosynthetic activity, photochemical efficiency and drought-resistance abbitity, which indicated that P. euphratica had a better ecologically adaptation mechanism to desert environment than P. pruinosa. Currently, the desert dominant species grow normally at 5 m groundwater level in the upper reaches of Tarim River. |
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