The drought stress and rehydration influence on chlorophyll fluorescence characteristics of Barbula fallax Hedw.in areas of karst rocky desertification:Case study near Huaxi district,Guiyang City
ZHANG Xian-qiang
WANG Shi-jie
SUN Min
Abstract：Guiyang city is located in the central Guizhou Province,at an average elevation of 1 100 m,annual average temperature 15.2 ℃ and annual average rainfall of 1 178 mm.The soil in Guiyang is predominately calcareous (accounting for 85 %),whose parent rocks are mainly dolomitic limestone and calcium dolomite. Its forest coverage is 5 %-15 %,the vegetation coverage is 10 %-90 %,the bare rock is 30 %-90 %, the land reclamation is 10 %-70 %,and the average rocky desertification is 36.79 % .Huaxi district in Guiyang is taken as an example for ecological restoration and treatment research,which provides the basis for scientific selection of drought-resistant plants for cultivation in karst rocky desertification areas.Chloro-phyll-fluorescence was measured by a handy PAM-2100 fluorometer in moss Barbulafallax Hedw.when drought and rehydration affected chlorophyll content and fluorescence under increased drought stress,the to-tal chlorophyll content first dropped ,and then increased gradually.F0 and qN of three kinds of mosses in-creased while the Fm ,Fv/Fm,Yield,ETR and qP decreased with drought stress.Fluorescence parameters after rehydration were restored to normal levels by mild to moderate stress,and severe stress is more diffi-cult to return to the control level.
Keywords：Barbulafallax Hedw.drought stressrehydrationchlorophyll fluorescence parameters
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 77-81 )