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《Journal of Ecology and Rural Environment》 2015-06
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Effects of Drought Stress on Growth and Photosynthetic Characteristics of Eucalyptus Grandis Saplings

ZHOU Guang-liang;LUO Jie;HU Hong-ling;HU Ting-xing;CHEN Hong;WANG Rui;College of Forestry,Sichuan Agricultural University;  
To study effects of drought stress on growth and photosynthetic characteristics of Eucalyptus grandis saplings,a pot experiment kept under continuous drought was performed. Growth and photosynthetic parameters of the saplings were monitored once every two days after irrigation,that is,on D_2,D_4,D_6,D_8,D_(10),D_(12),D_(14) and D_(16),while the sampling with normal irrigation as DO. Results show that( 1) during the first 6 days,although growth of the saplings in ground diameter and plant height declined,it did not differ much from that on D_0( P 0. 05); however,with the stress going on( D_8-D_(16)),the growth of the saplings in ground diameter and plant height dropped significantly.( 2) with the stress going on,the content of chlorophyll a( Chl a) in the saplings decreased significantly( P0. 05),whereas chlorophyll a / chlorophyll b ratio( Chl a / b) followed a rising-and-then-falling trend,and the content of Chlorophyll b and carotenoids on D2 did not change much from their respective ones on D_0( P0. 05),but were getting much lower from D_4 than those on D_0( P 0. 05);( 3) with the stress going on,net photosynthetic rate( Pn),transpiration rate( Tr),stomatal conductance( Gs) of the saplings decreased significantly( P0. 05) while intercellular CO_2concentration( Ci) decreased first and then increased;( 4) with the stress going on,apparent quantum yield( YAQ),Ru BP apparent carboxylation rate( Ec),light saturation point( Lsp) and CO_2 saturation point( Csp) of the saplings were all on declining trends,while light compensation point( Lcp),CO_2 compensation point( Ccp) on rising ones and maximum net photo-syntheticrate( Pmax) was on a declining one. In summary,with the drought stress aggravating,the content of photosynthetic pigments in the saplings decreased; stomata closed partly; photosynthetic organs were damaged to some extent,thus greatly reducing the saplings' ability to use light and CO_2 and their photosynthetic rate,and consequently suppressing growth of the E. grandis saplings.
【Fund】: 四川省教育厅重点课题(13ZA0246);; 国家“十二五”科技支撑计划(2011BAC09B05)
【CateGory Index】: S792.39
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