The Early Growth And Cold Resistance Research Of SiChuan Main Varieties Walnuts

Walnut(Juglans regia L.),Walnut(Juglandaceae),Wilnut(Juglans)is China’s i mportant economic crops.lt is one of the important tree species of returing farmland to forest in recently.Sichuan province make a great contribution to the production of China Walnut.According to the survey of Sichuan walnut,Walnut in Sichuan prov ince has the very high genetic heterozygosity,in a large range variation,abundant germplasm resources.However,after years of introduction of rural walnut,problem su ch as walnut poor "seeds" and "output","planting structure is not reasonable" shoul d to be solved.After planting 44 different walnut clutivars in different climate zoni ng area,this research through investigating the early growth index and types of plan t diseases and insect pests,analysis of the cold resistance of walnut,in order to mat ching species with the site.The leaves pick from the same part of walnut in Congzhou were investigated with method of artificial simulation of low-temperature.Put the materials in 3℃,0℃,-3℃-6℃,-9℃ low temperature.Filter out the relevant for principal components nanl ysis,and synthetically evaluate cold resistance of walnut clutivars combining with fu zzy mathematics method and cluster analysis.Main conclusion were as follows:Classify comprehensive ability to cold resistance of 44 walnut clutvars in Cong zhou from strong to weak,the 44 walnut clutivars could be divided into 4 group by cluster analysis.Chuanzao no.2,Xiangsu,Weibo 01,Mianyang,Meigudapao,Bashanwumi zi 01,Shimianzhi,Lianglin 98,Lianglin 119,Kangwu no.1,Leixi had the best cold resis tance.Qingxiang,Chuanzao no.1,Baihetanmi,Zaofeng,Bailong no.1,Shuling,Shuangzao,Bo kezao,Kelongzao,Zisenzaohe,had the better one.Qiqushanhetao,Nanfu no.1,Zhenzhuhet ao,Shimianjuxinghetao,Zipihetao,Tonghe 0046,Mianhe no.1,Shujiang no.2,Linping-l,Qi ngchuan no.1 had the poorer cold resistance.Yanyuanzao,Tonghe 0035,Shuyuan no.3,Chunxiang,Shjuxin no.1,Shuxing no.1,Chuanhezao,Tonghe 0147,Nanhe no.2,Tonghe 0114,Shuxing no.6,Shuyuan no.4,Nanhe no.l Were the poorest.Set up the rearch in Renshou town,Meishan city,SheHong town,SuiNing city,Gu Lin town,LuZhou city,AnXian town,Mian Yang city,LiXian town,Aba city,DeChang to wn,LiangShan city.Synthetically ecaluate growth of walnut clutivars combining with fuzzy mathematics method and cluster analysis.Main conclusion were as follows:(1)The Dechang area is located in south of the Liangshan state,It belongs to th e area of walnut cultivation in the south mountain of Sichuan.The land resources a nd natural conditions are superior,the potential for developing walnut production is good.In combination with the specific growth situation of the discussion the anti-col d ability of the species is considered.Chuanzao no.2,Chuanzao no.1,Shuling,Shuangza o are appropriate to introduce the Dechang area.The test site is high in altitude,wat er,temperature is good,disease and insect pets are rare.In the future we should vigor ously develop the breeding and utilization of good seeds,promote the of the walnut industry by popularizing the application of inferior tree modification and abundant production technology.(2)Anxian,Wangcang belongs to the area of cultivation in north and north-east of Sichuan.It belongs to subtropical humid climate type.It is a traditional walnut pro duction area.In combination with the specific growth situation of the discussion the anti-cold ability of the species is considered.Shuling,Shuangzao,Shuxing no.1,Chuan zao no.1,Chuanzao no.2 are appropriate to introduce the Anxian and Wangcang area.The area is ceperienced in walnut cultivation,and the pest control is well.The winter temperature of Wangcang is up 0℃.The clutival of walnut survival well.(3)Shehong,Renshou are located in Suining and Meishan,It belongs to the area of cultivation in centeal of basin of Sichuan.There are some differences in the fitne ss conditions of walnuts in this area.In combination with the specific growth situat ion of the discussion the anti-cold ability of the species is considered.Shuling,Chuan zao no.2,Shuangzao are appropriate to introduce the Shehong and Renshou area.The distribution of rainfall and time distribution in suining,is uneven.The evaporation r ate is greater,and the drought is a serious natural disaster.Good control of water an d nutrition should be taken to increase the death of walnuts.In production,Wangcan g Shehong should strengthen the management of planting areas,reducing the phenom enon of land mixing in cultivated land and economy.(4)Gulin is belongs to the area of cultivation in west-south mountain of Sichua.n.Nanhe no.2,Nanhe no.1,Chuazao no.2 are appropriate to introduce this area.Chuanz ao no.2 is better.The disease is severe in this area,and the same species grows wor se than other good walnut cultivation areas.The experimental management should be strengthened in practice.(5)Lixian is located in east-south of Aba state.Lixian is belongs to the area o f cultivation in west mountain of Sichua.It have a typical dry valley climate type.Ti s distric is the most suitable area for the cultivation of walnut and key walnut in Sichuan province.But the survival of walnut in Lixian is bad.Beause of the poor gr owth environment of the test area,the case of the walnut growing in the study was not good.Chuanxiang,Qingxiang,Chuanzao no.2,Chuanhezao,Kelongzao,Bokezao,can i nsure the basic survive in Lixian.Cold resistance in consideration,Qingxiang,Chuanza o no.2,Chuanzao no.1,Kelongzao,Bokezao are better.