）、河北核桃（Juglans hopeiensis Hu）和野核桃（Juglans cathayensis Dode.），引进种有心形核桃 、吉宝核桃和黑核桃。
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Although the germplasm of walnut was rich and widely distributed in China, research on the genetic diversity of the Juglans hopeiensis Hu was still a blank.
我国核桃种质资源十分丰富,存在许多特异种质资源,但是对我国河北核桃的遗传多样性的研究非常缺乏。
参考来源 - 河北核桃ISSR分子标记的遗传多样性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
影响河北核桃净光合速率日变化的主要因子是光合有效辐射、叶片温度及胞间CO_2浓度。
The diurnal variation of Pn in hebei-walnut was influenced by light intensity, leaf temperature and intercellular CO2 concentration.
利用这一模型可对河北省山区核桃立地质量进行数量化评价，为河北省山区核桃的栽培生产管理提供了理论依据。
Using this model to appraise the Hebei province mountainous area walnut vertical quality, it provided the theory basis for Hebei province mountainous area walnut management of cultivation production.
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