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《Acta Prataculturae Sinica》 2008-01
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Study on the photosynthesis and physiological adaptability of herbage in Eucalyptus grandis herbage inter-cropping system

LIU Chuang,HU Ting-xing,LI Qiang,LI Ren-hong,XIE Cai-yong,WU Xiao-shan (Sichuan Provincial Key Laboratory of Ecological Forestry Engineering,Sichuan Agricultural University,Ya'an 625014,China)  
Dactylis glomerata,Lolium perenne and Hemarthria compressa were inter-cultivated in Eucalyptus grandis forest with different canopy densities.Chlorophyll content,chlorophyll fluorescence,daily photosynthesis,biomass of three herbage species were studied to analyze their growth under different shading.The results showed that: 1) As canopy densities increased,both total chlorophyll contents(Chl) and chlorophyll b(Chlb) of three herbage species were higher than their CK(without shading),and chlorophyll a/b(Chla/Chlb) of the former two species significantly decreased(P0.05).2) As canopy density increased,PSⅡ efficiency(Fv/Fm) of D.glomerata and L.perenne increased at first,and then decreased when the canopy density reached about 0.60.The Fv/Fm values of D.glomerata and L.perenne were higher than that of H.compressa,but under shading,the increment of the value was lower than that of H.compressa.3) Daily photosynthesis of the three herbage species demonstrated a curve with one peak.When the canopy densities were below 0.53 for D.glomerata and below 0.42 for L.perenne,daily average net photosynthesis rates(Pn) were higher than their CK.While the Pn of H.compressa in inter-cultivated systems was smaller than CK.4) The biomass of H.compressa in the CK was the highest,but it gradually decreased as the canopy density increased.When canopy density reached 0.56,the biomass of H.compressa was still higher than the highest biomass of the other two herbages.As a whole,the response of three herbages to a faint light environment is different.Under shading conditions,D.glomerata and L.perenne mainly exhibited an increase of Chlb,but for H.compressa,the increase of Fv/Fm.The shading tolerance of the three herbages was D.glomerataL.perenne H.compressa.The results suggested that when the canopy density was below 0.54 for D.glomerata and below 0.34 for L.perenne,shading can promote their growth.
【Fund】: 国家科技部“十五”重大科技攻关项目(2001BA606A);; 四川省重点学科建设项目(SZD0419)资助
【CateGory Index】: S54;S792.39
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