摘要
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。
Objective： To study the diurnal variation of net photosynthetic rate（Pn） and main influencing factors in different types of Pueraria thomsonii,aimed at providing the theoretical basis for breeding the fine varieties of P.thomsonii suitable for the local light condition.Method： Diurnal variations of photosynthesis in leaves of different types of P.thomsonii were determined with the Li-6400 Portable Photosynthesis System.Result： ①Diurnal variation of Pn,transpiration Rate（Tr）,stomatal conductance（Gs） in leaves of six varieties of P.thomsonii showed unimodal curve and asymmetric bimodal curve.Diurnal variation of water use efficiency（WUE）,intercellular CO2 concentration（Ci） showed single valley curve.Diurnal variation curve of stomatal limitation value（Ls） was single peak and S-type.② Pn in leaves of six varieties of P.thomsonii was positively correlated with photosynthetic active radiation（PAR）,air temperature（Ta）,Gs,and negatively correlated with air relative humidity（RH）,Ci,Pn of all varieties were very significantly correlated with PAR,Gs.Conclusion： Diurnal variations of photosynthesis in leaves of different types of P.thomsonii show significant difference.Jiuding,Chuanyu,Gange,Dijin No.1 planted in Ya′an overcome ＂midday depression＂ phenomenon.Hechuan has the greatest photosynthetic potential,suitable for planting in forest understory and intercropping with high stalk to avoid the strong flashes.Planted in long-day region was beneficial to its growth.CO2 use efficiency of Geboshi No.11 and Dijin No.1 were significantly higher than that of the others.The accumulation efficiency of organics can be increased in cultivation management by fertilizing CO2.
出处
《中国中药杂志》
CAS
CSCD
北大核心
2010年第22期2954-2958,共5页
China Journal of Chinese Materia Medica
基金
四川省林业科技推广项目(08-04)
四川省科技富民强县重点项目(07NG001-020)
关键词
粉葛
光合
日变化
影响因子
Pueraria thomsonii； photosynthesis； diurnal variation； influencing factors
