Nutrient relations and root mycorrhizal status of healthy and declining beech (Fagus sylvatica L.) in Southern Britain
Nutrient relations and root mycorrhizal status of healthy and declining beech (Fagus sylvatica L.) in Southern Britain
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英国南部健康和衰退山毛榉（Fagus sylvatica L.）的营养关系和根菌根状况
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
M. Ashmore
中科院分区：
文献类型：
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作者：
S. Power;M. Ashmore
许多研究已经进行了调查森林衰退的大规模问题，这影响了整个欧洲和北美的大量树木。各种物种都发现了地上和地下营养失调的证据。此外，有人认为，在地上树木健康的差异往往反映在地下，特别是在根系衰退的树木。调查的根系活力，土壤和叶片化学的健康和不健康的山毛榉（Fagus sylvatica L.）在英国南部的一些地点进行，覆盖了一系列不同的土壤类型。在每个站点，健康和不健康的树木生长在非常接近进行了比较，以避免大规模的环境差异，可能会预期比较时，在不同的location.Healthy树木的立场被发现有显着更大比例的活菌根根比他们的不健康的邻居在大多数调查的网站。此外，在对比健康的树木之间的土壤化学显着差异，健康的树木一般生长在土壤中含有较高浓度的钙，镁和钾和较低的铝/钙比。叶片养分含量差异很小，表明土壤化学尚未限制养分吸收。根系差异的重要性，在不利的土壤和气候条件的耐受性进行了讨论与树木健康。
Many studies have been carried out to investigate the wide scale problem of forest decline that is affecting vast numbers of trees throughout Europe and North American. Evidence of nutritional disturbances, both above- and below-ground, has been found for a variety of species. Furthermore, it has been suggested that differences in above-ground tree health are often reflected below ground, particularly in the root systems of declining trees.An investigation of root vitality, soil and leaf chemistry of healthy and unhealthy beech (Fagus sylvatica L.) was carried out at a number of sites in southern Britain, covering a range of different soil types. At each site, healthy and unhealthy trees growing in very close proximity were compared in order to avoid large scale environmental differences that might be expected when comparing stands of trees at different locations.Healthy trees were found to have significantly greater proportions of live mycorrhizal roots than their unhealthy neighbours at most of the sites investigated. In addition, significant differences in soil chemistry were found between trees in contrasting health, with healthy trees generally growing in soil containing higher concentrations of calcium, magnesium and potassium and lower aluminium/calcium ratios. Very few differences were found in leaf nutrient content, suggesting that soil chemistry is not yet limiting nutrient uptake. The importance of root system differences in the tolerance of unfavourable edaphic and climatic conditions is discussed with respect to tree health.