不同土壤水分条件下107杨幼苗(Populus×euramericanacv.“74/76”)秋季光响应研究  

Photoresponse of Populus×euramericana cv."74/76" Cutting Seedlings in Different Soil Moisture Conditions in Autumn

作　　者：周源[1] 马履一[1] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083

出　　处：《西北林学院学报》2009年第5期1-4,共4页Journal of Northwest Forestry University

基　　金：十一五"国家科技支撑计划重点项目"速生丰产林良种壮苗规模化生产技术研究与示范"(2006BAD24B01);北京市教育委员会学科建设与研究生培养项目"北京城市生态环境建设产学研联合培养研究生基地

摘　　要：在北京地区，利用Li-6400便携式光合仪的Li-6400-02B红蓝光源设定从O～2000μmol·m^-2·s^-1的光强，通过人工控水的方法取得3个不同的水分梯度，对秋季107杨（Populus×euramericana cv．“74／76”）1a生扦插苗木的各生理生长参数的光响应规律进行研究。结果表明，土壤含水量分别为13．249，6～17．65％、17．65％～22．06％时，107杨1a生扦插苗净光合速率能维持较高水平，当土壤含水量低于13．24％时，其净光合速率受气孔限制作用明显降低，苗木生长受到影响。Physiological indices of 1-year-old cutting seedlings of Populus × euramericana cv. ＂74/76＂ was conducted in this study in auturm in Beijing were measured to study the photoresponse of the seedlings under 3 artificially controlled water levels corresponding to 40 % - 100 % of the water holding capacity（WHC） of the soil and with the simulated photosynthetic radiation （SPR） of portable photosynthesis system（Li- 6400）. The results showed that photosynthetic rate（Pn）, transpiration rate （Tr） and water use efficiency of leaf （WUE） had clear threshold value response to soil moisture and photosynthetic active radiation. To maintain the normal growth and higher levels Pn, soil water content should be within the range of 17.65%-22.06%, and 13.24%-17.65% . When the soil water content is below 13.24%, the decline of Pn was mainly caused by stomatal limitation.

关 键 词：107杨 净光合速率 蒸腾速率 光响应 

分 类 号：S718.43[农业科学—林学]