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首页> 外文期刊>Quarterly Journal of Forestry >Walnut hybrids in the UK: fastgrowing quality hardwoods.
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Walnut hybrids in the UK: fastgrowing quality hardwoods.

机译：英国的核桃杂种：速生优质硬木。

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A field trial was established in 2003 in Paradise Wood experimental woodland in South Oxfordshire to evaluate five walnut (Juglans regia) hybrid varieties: NG23, NG38 and MJ209 from France, Bressanvido from Italy, and IRTA X-80 from Spain. The walnut trees were planted with Italian alder (Alnus cordata) to provide optimum architectural compatibility and for nitrogen fixation, silver birch (Betula pendula) for rapid establishment and shelter, and wild cherry (Prunus avium) as a companion timber species. Walnut tree height was measured to the highest live bud at planting time, and at the end of each growing season. Survival was highly variable between hybrids. The survival percentage during the first year was the same after five years, except for IRTA X-80, which showed very poor survival thus, was excluded from the growth analysis. Walnut height growth was poor during the first four years, except for NG38, which appeared to establish well, even after one year. Height growth of NG38 was poor, growing only 31 cm in four years. Variance analysis of height increment showed highly significant variation between hybrids. Hybrids NG23, NG38 and MJ209 grew better than Bressanvido. NG38 trees significantly grew more than NG23 and Bressanvido trees. At the end of 2008, the height of NG38, NG23 and MJ209 trees was 3.18, 2.9 and 1.54 m, respectively. It was postulated that in the first four years of growth, the walnuts were investing in root, rather than shoot growth, and once the root to shoot ratio was in balance, the trees put on the top growth, as indicated by the fifth year increment results. The hybrid walnuts may be used for short rotation forestry systems.
机译：2003年在南牛津郡的天堂木实验林地建立了田间试验，以评估5种核桃（ Juglans regia ）杂种：法国的NG23，NG38和MJ209，意大利的Bressanvido和IRTA X-80来自西班牙。核桃树种植有意大利al木（ Alnus cordata ），以提供最佳的建筑相容性和固氮作用;白桦树（）用于快速建立和庇护以及野生樱桃（ Prunus avium ）作为伴生木材种类。在种植时间和每个生长季节结束时，测量核桃树的高度，使其达到最高的活芽。杂种之间的生存差异很大。在第一年的存活百分比在五年后是相同的，除了IRTA X-80，它显示出非常差的存活率，因此被排除在生长分析之外。除了NG38，即使在一年后，它的生长情况也很好，核桃头的头四年生长不佳。 NG38的高度增长很差，四年内仅增长了31 cm。高度增量的方差分析显示杂种之间的高度显着差异。混合动力车NG23，NG38和MJ209的增长优于Bressanvido。 NG38树的生长速度明显超过NG23和Bressanvido树。到2008年底，NG38，NG23和MJ209树木的高度分别为3.18、2.9和1.54 m。据推测，在生长的前四年中，核桃投资的是根而不是苗的生长，一旦根与茎的比例达到平衡，树木就达到了最高的生长，如第五年的增量所示结果。杂种核桃可用于短轮伐林业系统。

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