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Volume 38 Issue 6
Dec.  2019
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Article Navigation >  CARSOLOGICA SINICA  > 2019  >  38(6): 901-909
ZHANG Xianqiang, LIU Tianlei, CONG Chunlei. Effect of alternating wetting-drying on physiological features of water content and photosynthesis of Erythrodontium julaceum (Schwaegr.) Par. in karst habitat[J]. CARSOLOGICA SINICA, 2019, 38(6): 901-909. doi: 10.11932/karst20190607
Citation: ZHANG Xianqiang, LIU Tianlei, CONG Chunlei. Effect of alternating wetting-drying on physiological features of water content and photosynthesis of Erythrodontium julaceum (Schwaegr.) Par. in karst habitat[J]. CARSOLOGICA SINICA, 2019, 38(6): 901-909. doi: 10.11932/karst20190607
shu

Effect of alternating wetting-drying on physiological features of water content and photosynthesis of Erythrodontium julaceum (Schwaegr.) Par. in karst habitat

doi: 10.11932/karst20190607
  • 1.

    Guizhou Police College, Guiyang,Guizhou 550005, China/Anshun University, Anshun,Guizhou 560000, China

  • 2.

    Anshun University, Anshun,Guizhou 560000, China

  • Publish Date: 2019-12-25
    Abstract
  • This study presents a theoretical foundation for recovering and controlling the environments of rocky desertification ecology. It relies on comparing the adaptability to habitat heterogeneity in karst rocky desertification areas with arid desert of karst and seasonal drought environments and analysis of moisture content and photosynthetic physiological adaptation. Taking E. julaceum growth on rock as the object, water content and photosynthetic physiological indexes are measured in the Puding City, Guizhou Province. The results show that the drought makes water potential(Ψs), free water content(Va), water content and relative water content(RWC) of E. julaceum decrease, bound water content(Vs), water saturation deficiency(WSD) and ratio of bound water content to free water content(Vs/Va) increase, leaf water-holding ability weakened, and transpiration rate(Tr) decreased. The response sensitivities of these indices to water’s action are different. With increase of drought, total chlorophyll content first rises and then drops, finally tends to increase. qN of three kinds of mosses is negatively correlated while Fv/Fm, Yield, ETR Pn and qP decline with drought are positively correlated. The Pn gradually declines in mild drought dehydration. After 48 h Pn falls sharply, photosynthesis is affected by the serious drought. Along with the process of drought, changes of transpiration rate (Tr) have no significant differences between species. Fluorescence parameters after re watering can be restored to normal levels in mild to moderate force, and severe force is more difficult to return to the control level. The epilithic mosses has strong drought resistance ability, water metabolism and photosynthetic physiological mechanism to adapt to the karst environment, indicating a pioneer species in the process of vegetation restoration and reconstruction in the karst rocky desertification areas.

     

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