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目的:对6个粉葛品种净光合速率日变化(Pn)及其影响因子进行研究,旨在为选育适合当地光照条件生长的优良粉葛品种提供理论依据。方法:利用L i-6400光合测定仪,对不同粉葛品种叶片进行光合日变化的测定。结果:①6个粉葛品种叶片Pn、蒸腾速率(Tr)、气孔导度(Gs)光合日变化曲线呈单峰和不对称双峰曲线;水分利用率(WUE)、胞间CO2浓度(Ci)日变化曲线呈单谷型;气孔限制值(Ls)呈单峰和S型变化曲线。②6个粉葛品种叶片Pn与主要影响因子光合有效辐射(PAR),空气温度(Ta),Gs呈正相关,与空度相对湿度(RH),Ci呈负相关,各品种Pn与PAR,Gs均呈极显著的正相关。结论:6个粉葛品种叶片的光合日变化具有明显的差异;九顶大粉葛、川渝大粉葛、赣葛、地金1号在雅安地区种植能克服中午高光强时的“午休”现象;合川大粉葛具有最大的光合潜能,可种植林下、或利用高秆间作遮荫避免强光刺激,在长日照区域栽植利于它的生长;葛博士11号和地金1号的CO2利用效率显著高于其他品种,在栽培管理中可结合CO2施肥以提高有机物质的积累效率。
Aims: To study the diurnal variation of net photosynthetic rate (Pn) and its influencing factors of six cultivars of Vitex japonica, and to provide a theoretical basis for the selection of superior Vitex cultivars suitable for growing in local light conditions. Methods: The photosynthetic diurnal changes of leaves of different powder cultivars were determined by L i-6400 photosynthesis analyzer. Results: ① The photosynthetic diurnal variation curves of leaf Pn, Tr, and Gs showed single peak and asymmetric bimodal curves in six cultivars. Water use efficiency (WUE), intercellular CO2 concentration (Ci) The daily variation curve showed single valley type. The limiting value of stomatal limitation (Ls) showed single peak and S-shaped curve. Pn of six cultivars had positive correlation with PAR, air temperature (Ta) and Gs and negatively correlated with relative humidity (RH) and Ci, and Pn, PAR and Gs There was a significant positive correlation. Conclusion: The photosynthetic diurnal changes of leaves of six powder cultivars were significantly different. Nine top powder, Sichuan and Chongqing Dapoe, Ge and Djin 1 were planted in Ya’an to overcome the noises at midday, "Phenomenon; Hechuan Daping Ge has the largest photosynthetic potential, can be planted under the forest, or use of tall stalks for shade to avoid glare stimulation, planting in the long sunshine region conducive to its growth; Dr. GE and No. 1 CO2 utilization efficiency was significantly higher than other varieties, in the cultivation and management can be combined with CO2 fertilization to improve the accumulation of organic matter efficiency.