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The walnut tree is a perennial deciduous fruit tree,with large economic values. It belongs to Juglans and Juglandaceae. Juglans consists of over 20 species distributed in Asia, Europe and the Americas. Five species originated in China, namely J. regia, J. mandshurica,J. cathayensis, J. sigillata and J. hopeiensis. Two spe -
cies are widley cultivated, i.e., the common walnut and J. Sigillata. The former one widely distributes throughout the north and south of China, and the latter one is mainly distributed in the Southwest area. China is one of the major countries for walnut production. China has a long history for walnut cultivation starting in the Western Han Dynasty, and there have been many treatise about the varieties, distribution, characters, cultivation techniques and economic usage of walnuts published from A.D. 400 onwards. Traditional Chinese medicinal literatures believe that walnut is healthy to
man’s brains, and the fruit, peel, seed shell, wood and leaves of walnut tree can be used in industry and many other purposes. The nucleoli is nutritious with unique flavor. Walnut is recognized as one of the four famous nuts in the world. Walnut trees can play important roles
in afforestation of waste land, soil and water conservation and improving the environment. Walnut has been extensively used by Chinese people for long time. The research on the walnut germplasm resources is of great significance in promotion of walnut production, use and expoitation of walnut resources, and breeding of
new excellent varieties. In China, intensive cultivation of walnut using few productive varieties is causing genetic uniformity, and
some genetic resources of walnuts are disappearing at unprecedented rates, which sometimes makes these walnut plantation more vulnerable to pests and environmental
stresses. Making better use of a broader
range of the walnut’s genetic diversity is becoming one optional solution to this problem. Fully using walnut germplasm resources can help scientists bring out more new varieties and increase the genetic diversity of cultivated
walnut. The full spectrum of walnut dermplasm
should comprise diversity of genetic material contained in traditional varieties, modern cultivars, wild species and other relatives. These resources of genetic diversity provides plant breeders with options to develop, through selection and breeding, new and more productive
varieties, that are resistant to virulent pests and diseases and adapted to changing environments. Using local walnut germplasm resources, walnut breeding in China has made some achievements in the past years, breeding a large number of good varieties and superior clones. With the improvement of living
standards of Chinese people, and the recognition of the nutritional value and the medical effects of walnut, the demand for higher quality walnut has been increasing,promoting the development of walnut product and expanding the use and exploitation of walnut resources. Further cultivation of high-yield, strongly-resistant,
better-quality and easily-processed walnut varieties is becoming an important goal for walnut breeding in the future of China.

To summarize the research results of walnut germ
plasm in China and introduce the achievements to
more people who are interested in it, the book Walnut Germplasm Resources in China was published by China Forestry Press in 2011. Based on the walnut germplasm resources in 15 provinces or autonomous regions and municipalities of China, the book comprehensively
introduced the walnut germplasm resources
in China. The book is divided into two parts. The first part introduced the origin, cultivation history and the main usages of walnut, and the outlines of germ plasm
conditions of the common walnut, pecan and beak
walnut. The second part introduced all varieties of the common walnut, pecan and beak walnut, and the geographic distribution of germplasm resources, the biological characteristics and the main features of cultivation.

The book is informative, comprehensive and
characteristic in both theoretical elucidation and practicality in walnut management. The book would become a good reference for the persons who are engaged in walnut geography, biology, breeding, management and other relevant fields.

序
前言
上篇 总论
第—章 核桃的起源、栽培历史及主要用途
一、食用价值
二、药用价值
三、其他经济价值
第二章 中国核桃种质资源概述
第一节 核桃分类概况
第二节 核桃种质资源概述
一、核桃种质资源
二、山核桃种质资源
三、喙核桃种质资源
第三节 核桃种质资源分类描述
一、核桃
二、泡核桃
三、麻核桃
四、核桃楸
五、野核桃
六、黑核桃
七、吉宝核桃
八、心形核桃
九、山核桃
十、长山核桃
十一、喙核桃
下篇 主要种质资源
第三章 核桃属
第一节 核桃
一、优良品种
(一)国内品种
1.薄丰
2.薄壳香
3.薄壳早
4.北京861
5.川核1号
6.川核2号
7.川核3号
8.川核4号
9.川核5号
10.川核6号
11.川核7号
12.川核8号
13.川核9号
14.川核10号
15.川核11号
16.岱丰
17.岱辉
18.岱香
19.汾州大果
20.丰辉
21.寒丰
22.和春6号
23.和上1号
24.冀丰
25.晋薄1号
26.晋薄2号
27.晋薄3号
28.晋薄4号
29.晋丰
30.晋龙1号
31.晋龙2号
32.晋绵1号
33.晋绵2号
34.晋绵3号
35.晋绵4号
36.晋绵5号
37.晋绵6号
38.晋香
39.京香1号
40.京香2号
41.京香3号
42.客龙早
43.魁香
44.礼品1号
45.礼品2号
46.里香
47.辽宁1号
48.辽宁2号
4g.辽宁3号
50.辽宁4号
51.辽宁5号
52.辽宁6号
53.辽宁7号
54.辽宁8号
55.辽宁10号
56.龙珠
57.鲁丰
58.鲁光
59.鲁果1号
60.鲁果2号
61.鲁果3号
62.鲁果4号
63.鲁果5号
64.鲁果6号
65.鲁果7号
66.鲁果8号
67.鲁核1号
68.鲁香
69.绿波
70.绿岭
……
第四章 山核桃属
第五章 喙核桃属
参考文献
索引

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