【作者】 孙海燕； 尹增芳； 宁代锋； 李墨爱；

【Author】 SUN Hai-yan YIN Zeng-fang~* NING Dai-feng LI Mo-ai(College of Forest Resource and Environment,Nanjing Forestry University,Nanjing 210037)

【机构】 南京林业大学森林资源与环境学院；

【摘要】 本文研究了 Ca²⁺对杨树扦插苗光合作用及相关生理指标的影响,结果表明,杨树扦插苗生长的最适营养液 Ca^2-浓度为0．1mmol/L。营养液中低浓度（0．01、0．1mmol/L）Ca²⁺对杨树净光合速率（Pn）、叶绿素含量及根系活力均高于对照,其中以0．1mmol/L 培养的最高；Ca²⁺ 浓度达1mmol/L 时,杨树扦插苗的叶绿素含量、净光合速率和根系活力均开始下降,其中以叶绿素含量下降最为显著,低于对照；0、0．01、0．1、1mmol/L 四个 Ca²⁺浓度对杨树扦插苗的气孔导度（Gs）、胞间 CO₂浓度（Ci）和蒸腾速率（Tr）的影响均呈现“低—高—低”趋势,在0．01mmol/L 时达最高值,1mmol/L 时最低；Ca²⁺浓度增加至10mmol/L 时,杨树扦插苗存活60d,50mmol/L 时仅能存活30d。更多还原

【Abstract】 Effects of Ca²⁺ on photosynthesis and related indexes of poplar cuttings were studied in this paper.The results showed that,the optimal Ca²⁺ concentration in nutrition for growth of poplar cuttings was 0.1mmol/L.Net photosynthetic rate（Pn）,Chlorophyll content and root activity of poplar cuttings in low Ca²⁺ concentration（0.01、0.1mmol/L）were higher than contrast group. And the effects of 0.1 mmol/L were the most remarkable.Nevertheless,they began to decrease when Ca²⁺ concentration was up to 1mmol/L,and Chlorophyll content was decreased significantly lower than contrast group.The effects of 0,0.01,0.1 and lmmol/L Ca²⁺ concentration on stomata conductance（Gs）,intercellular CO₂ concentration（Ci）and transpiration rate（Tr）of poplar cuttings presented low-high-low tendency,and which reached the highest value in Ca²⁺ concentration of 0.01mmol/L while the lowest value in Immol/L.when Ca²⁺concentration increased to 10mmol/L,poplar cuttings survived 60 days,but only 30 days survived in 50mmol/L更多还原