梭梭(Haloxylon ammodendron); 白梭梭(H.persicum);光合作用; 气体交换; 环境因子; 古尔班通古特沙漠," /> 梭梭(Haloxylon ammodendron); 白梭梭(H.persicum);光合作用; 气体交换; 环境因子; 古尔班通古特沙漠,"/> Gas Exchange of <em>Haloxylon ammodendron</em> and <em>H. persicum</em>

›› 2014, Vol. 31 ›› Issue (3): 542-549.

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Gas Exchange of Haloxylon ammodendron and H. persicum

TIAN Yuan1,2,3,TAXIPLAT Teybay1,4, XU Gui-qing2,3   

  1. 1. College of Resources and Environmental Sciences, Xinjiang University, Urumqi 830046, China;
    2. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, 
    Chinese Academy of Sciences, Urumqi 830011, China;
    3. Fukang Station for Desert Ecosystem Research, Chinese Academy of Sciences, Fukang 831500, Xinjiang, China;
    4. Key Laboratory of Oasis Ecology of the Ministry of Education, Xinjiang University, Urumqi 830046, China
  • Received:2014-03-28 Revised:2014-04-02 Online:2014-05-15 Published:2014-05-30

Abstract: Haloxylon ammodendron[WTBZ] and [WTBX]H.persicum[WTBZ] are two main edificators in the Gurbantonggut Desert, Xinjiang. Based on the simultaneous observations of photosynthetic characteristics and related environmental factors affecting the growth of H.ammodendron and [WTBX]H.persicum[WTBZ], different photosynthetic responses of the two species to environmental factors were studied. Results showed that H.ammodendron was better in using lowlight than [WTBX]H.persicum[WTBZ], but it was contrary in using highlight. The curves of daily variation of net photosynthetic rate, stomatal conductance and transpiration rate were all unimodal, the time of occurring the peak values of net photosynthetic rate and stomatal conductance was slightly different, and the peak value of transpiration rate occurred always at 16:00. According to the variation of photosynthetic rate, intercellular CO2 concentration and stomatal limitation of H.ammodendron and [WTBX]H.persicum[WTBZ], it was considered that the “midday depression” of photosynthesis was mainly caused by stomatal factors. The daily averages of photosynthetic rate, transpiration rate and water use efficiency of [WTBX]H.persicum[WTBZ] were higher than those of H.ammodendron. Correlation analysis revealed that the photon flux density was the most significant environmental factor affecting the photosynthetic rate of H.ammodendron and [WTBX]H.persicum[WTBZ].

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