北京林业大学学报2011，Vol.33Issue(5)：56-60,5.
不同供氮水平对栓皮栎播种苗光响应曲线的影响
Effect of different nitrogen supply on light-response curves of Quercus variabilis seedlings
摘要
Abstract
In order to provide a theoretical foundation for nitrogen fertilizer management of Quercus variabilis seedlings,using exponential nitrogen fertilization regimes,the effects of nitrogen treatments on light-response curves of Q.variabilis seedlings were studied under sand-cultured condition.The seedlings were planted in pots,supplied with four nitrogen application levels（0,120.6,216.4 and 329.2 mg/（seedling·year））.The results show that various nitrogen application levels had different effects on the light-response curves of Q.variabilis leaves,depending on the growth phases.At the initiation phase,all the simulation parameters of light-response curves showed no significant differences among treatments.At the fast-growth phase,the lack of nitrogen weakened the photosynthetic capability of seedlings in treatment CK（0 mg/（seedling·year）） sharply,which reduced the light saturation point（LSP）,maximum net photosynthetic rate（Pmax） and the apparent quantum efficiency（α）;meanwhile,the light compensation point（LCP） expressed a trend of increase.When the nitrogen level was raised from 120.6 to 216.4 mg/（seedling·year）,no significant variation about Pmax was found between the two treatments;however,the LCP of the seedlings in 216.4 mg/（seedling·year） treatment was lower and the LSP was higher.Yet,excessive nitrogen supply（329.2 mg/（seedling·year）） played a negative role on the photosynthetic ability of Q.variabilis seedlings.At the later phase,relatively higher photosynthetic efficiency was maintained in the seedlings in 216.4 mg/（seedling·year） treatment,comparing with the common decline in other three treatments.关键词
栓皮栎/播种苗/供氮水平/指数施肥/光响应曲线Key words
Quercus variabilis/seedlings/nitrogen application level/exponential fertilization/light-response curve分类
农业科技引用本文复制引用
杨自立,马履一,贾忠奎,王梓..不同供氮水平对栓皮栎播种苗光响应曲线的影响[J].北京林业大学学报,2011,33(5):56-60,5.基金项目
“十一五”国家科技支撑计划项目 （）
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” （）
中央高校基本科研业务费专项 （）
