In order to learn effects of different rootstocks on photosynthesis characteristics in walnut,taking 4-year-old trees of Shang 14 strains in the field as materials,which grafted taking Zhongningyi,Zhongningqiang,Zhongningqi,Juglans nigra and seeding walnut as rootstocks,the effects of the five rootstocks on photosynthetic characteristics of walnut leaves were researched,and the relationship between environmental factors and photosynthetic indicators was discussed.The results show that the diurnal variation of net photosynthesis rate (Pn) of walnut in five rootstock treatments present a single peak curve,but the peak values are significant different,Pn values of Zhongningqi and Zhongningqiang are significantly greater than that of seeding walnut,and light and temperature are major influencing factors of photosynthesis.The Pn-Par curves of five rootstock treatments are S type,and accord with quadratic curve model.Under the conditions of saturated luminous intensity,the order of the five rootstocks based on Pn value from high to low is Zhongningqi (23.12 μmol.m-2s-1),Zhongningyi (22.38 μmol·m-2s-1),seeding walnut (21.23 μmol·m-2s-1),Zhongningqiang (21.09 μmol·m-2s-1),Juglans nigra (20.14 μmol·m-2s-1).Therefore,Zhongningqi,Zhongningqiang and Zhongningyi are rootstock resources of walnut which can improve photosynthetic characteristics of walnut scion.%为了解不同砧木对核桃光合特性的影响情况,以中宁异、中宁强、中宁奇、黑核桃和实生核桃作砧木嫁接核桃优系“上14”的大田栽培4年生幼树为试材,研究了中宁异、中宁强、中宁奇、黑核桃和实生核桃5种砧木对核桃叶片光合特性的影响,并对环境因子与光合指标的相关关系进行了探讨.结果表明:经中宁异、中宁强、中宁奇、黑核桃和实生核桃5种砧木处理的核桃净光合速率的日变化曲线呈单峰曲线,在光合高峰时5种砧木处理核桃叶片的光合速率(Pn)存在显著差异,中宁奇、中宁强的Pn显著大于实生核桃,光照和温度是其主要影响因素；中宁异、中宁强、中宁奇、黑核桃和实生核桃砧木处理的光合-光强响应曲线呈S型,且符合二次曲线模型,5种砧木按照饱和光强下核桃光合速率由大到小排序依次为:中宁奇(23.12 μmol·m-2s-1)、中宁异(22.38 μmol·m-2s-1)、实生核桃(21.23 μmol·m-2s-1)、中宁强(21.09 μmol·m-2s-1)、黑核桃(20.14μmol·m-2s-1).试验结果表明,中宁奇、中宁强和中宁异是可以提高核桃接穗光合特性的砧木资源.
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