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早实核桃杂交育种试验初报 总被引:1,自引:0,他引:1
为创新四川核桃育种材料,在前期核桃种质资源调查的基础之上,以M1为母本,BKZ、KLZ、SQLG、YHT为父本,开展早实核桃杂交育种试验,测定杂交果实坐果率、结实率及表型性状特征。应用方差分析、多重比较对杂交果实坐果率、结实率、表型性状等指标进行分析。结果表明:(1)不同核桃种间杂交授粉的坐果率、结实率差异极显著(P0.01)。其中M1×KLZ坐果率最高,M1×BKZ结实率最高。(2)不同核桃杂交后代果实表型性状差异极显著(P0.01),且各杂交果实核壳表面特征各项指标整体表现较好。(3)不同核桃杂交果实表型形状指标变异系数较小,表明杂交果实表型形状遗传相对较稳定。 相似文献
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四川阿坝辐射松引种长期森林健康风险初步评估 总被引:2,自引:0,他引:2
Pinus radiata was introduced to the summer rainfall environments of Sichuan Province, China in the 1990s as a part of an afforestation pmgram for soil and water conservation in the arid and semi-arid river valley area of Aba Prefecture. Within this region a total area of 26 000 ha have been identified through climate matching as suitable and a further 63 000 ha potentially suitable for environmental plantings of P. radiata. The plantations are being established in widely separated small patches on steep and degraded slopes along the dry river valley The newly introduced P. radiata are exposed to two kinds of forest health risks: they may be attacked by (a) indigenous pathogens and pests against which they may not possess any resistance or (b) by inadvertently introduced foreign pests or pathogens. This paper presents a survey of the potential damaging pests and a preliminary assessment of forest health risks facing the P. radiata plantations over a much longer timeframe than the initial phase of introduction and early plantation establishment. An empirical appmach was adopted to evaluate forest health risks by a combination of literature review, examination of historical records of pest and disease outbreaks in the surrounding conifemus forests, field surveys and inspections, specimen collection and identification, and most importantly, expert analysis of the likelihood of attack by specific pests and pathogens and the subsequent impact of such attacks. The assessment identified some specific forest health risks to the long-term success of P. radiata introduction in this area. These risks are closely associated with the indigenous pests and pathogens of the two native pine species, P. tabulaeformis and P. armondii since these pests and pathogens are considered more likely to establish on P. radiata over time. Exotic pests and pathogens are of a quarantine concern at present. Based on the results of assessment, recommendations are pmvided to improve forest vigour and to reduce the forest health risks pos 相似文献
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为进一步发掘四川核桃的特异种质资源,在前期穗状核桃种质资源调查的基础之上,应用主成分分析和核桃坚果品质评分,通过对穗状核桃坚果三径值、单果重、核仁重、出仁率、核壳厚、粗脂肪和粗蛋白等指标的综合分析。结果表明:(1)主成分1~3的累计方差贡献率为88.49%,确定了3个反映穗状核桃主要性状的主成分及其主成分函数式,计算出各单株的重要主成分值。(2)建立了坚果综合性状评价函数模型,计算出各单株的主成分综合得分,进行综合比较和排序,各单株顺序为SQLG、HSZML、CTYM、PAXH、HSLH、XJPX。(3)筛选出优良单株3个,分别为HSZML、HSLH和SQLG。 相似文献
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无刺朝仓椒嫁接育苗试验研究 总被引:1,自引:0,他引:1
为探索无刺朝仓椒嫁接技术,以嫁接时间、嫁接方法、砧木类型为因素,开展了日本无刺花椒止止吕美系无刺朝仓椒的嫁接育苗试验研究,结果表明:(1)朝仓椒春季嫁接的最佳时间为2月下旬至3月中旬,最佳嫁接方法是单芽切接法,平均成活率为85.7%,最高94.1%;(2)朝仓椒夏季最佳嫁接时间为6月底至7月上旬,最佳嫁接方法是方块芽接法,平均51.6%,最高77.6%。(3)竹叶花椒和朝仓椒具有很强的嫁接亲和性,其中以狗屎椒为砧木的朝仓椒嫁接苗平均成活率、平均高生长量、平均地径生长量最高。 相似文献
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为加快四川核桃产业的发展,从2005年起先后从河北引进清香核桃优良品种。为进一步掌握清香核桃在四川不同地区引种栽培的生物学特性,探索其生长习性和结果规律,特开展清香核桃在四川的引种观察与栽培技术研究。通过三年的连续观察和综合分析,结果表明:(1)清香核桃在四川的适应性较强,以在海拔400~1800 m的阳性平地、缓坡栽植为宜。(2)树势健壮,树体较大,幼树时生长较为旺盛,枝条粗壮,侧芽萌芽率较低,成枝力较强。结果以顶生混合花芽为主,且单果、二果较多,果枝率偏低,丰产性表现一般。(3)该品种在配置适合当地物候期的授粉树、加强整形修剪、提高栽培管理技术的前提下,可适当扩大栽培面积与推广。 相似文献
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岷江上游干旱河谷山杏幼林地绿肥种植研究 总被引:4,自引:0,他引:4
在岷江上游干旱河谷山杏幼林地连续4 a利用雨季种植绿肥压青,增加土壤肥力,提高水分利用率,促进幼树生长研究,结果表明:(1)种植红豆草的土壤0-40 cm含水量旱季增加0.39 g·kg-1,0-20 cm土壤容重降低0.01 g·cm-3;种植草木樨土壤0-40 cm含水量旱季增加0.55 g·kg-1,0-20 cm土壤容重降低0.04 g·cm-3;种植沙打旺土壤0-40cm含水量增加0.30 g·kg-1,0-20 cm土壤容重降低0.03 g·cm-3;(2)种植绿肥压青,土壤有机质增加0.10-0.46 g·kg-1,土壤CaCO3含量下降0.93-1.04 g·kg-1,有效氮增加5.9-19.3 mg·kg-1,有效磷含量增加1.26-2.46 mg·kg-1,CEC比对照增加0.68-1.00 mg·100 g-1;(3)种植红豆草、草木樨、沙打旺绿肥压青对山杏树高、径生长有显著作用,尤其种植红豆草的山杏幼树生长最好,高、径生长为对照的2.1和2.2倍。 相似文献
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