龙脑樟叶片光合特性对氮磷钾肥的响应

The Response of Photosynthetic Characteristics of Leaves of Cinnamomum camphora chvar. Borneol to Different Fertilization Levels

通过"3414"不完全正交回归设计,研究氮磷钾肥对龙脑樟矮林光合特性的影响,以确定其生长发育最佳的施肥处理。结果表明随着氮磷钾肥单一施肥量的增加,龙脑樟叶片的叶绿素含量(Chl)、净光合速率(Pn)和胞间CO2浓度(Ci)均呈现"先增大后减小"的变化趋势;适宜的氮(N100 g/株)、磷(P2O5140 g/株)、钾(K2O 60g/株)用量及其配施能够明显增加龙脑樟的Chl和Pn,其中Pn受氮肥施用量的影响更大;氮、磷、钾肥之间交互效应不明显。通过龙脑樟光响应曲线拟合分析可知,在一定范围内,随着施肥量增加,龙脑樟的最大净光合速率(Amax)、光饱和点(LSP)和表观量子效率(AQY)均升高,而光补偿点(LCP)和暗呼吸速率(Rd)均降低,有利于龙脑樟叶片光合产物的积累,加快龙脑樟的生长发育。

Based on ＂3414＂ incomplete orthogonal regression design, the effects of fertilization of N, P and K on photosynthetic characteristics of Cinnamomum camphora chvar were investigated so as to determine the optimal fertilization mode for its growth.Borneol coppice leaves were studied.The results showed that with the increase of the single fertilization of N, P and K, Chl content, Pn and Ci tended to increase first decrease later.The Chl content and Pn could significantly be improved by applying the appropriate amounts of N （N 100g per plant） ,P（P205140 g per plant） and K（K20 60 g per plant） ,or their combination.The study found Pn to be most affected by nitrogen levels.No obvious interaction effect was found between nitrogen and phosphorus, / nitrogen and potassium, phosphorus and potassium, respectively. Photoresponse curves fitting analysis showed under definite fertilizer supply,Amax, LSP and AQY increased, LCP and Rd decreased with the fertilizer sup- ply rising by photoresponse curves fitting analysis.