Carbon, nitrogen, phosphorus, and sulphur concentration and partitioning in beech ecotypes (Fagus sylvatica L.): phosphorus most affected by drought
Carbon, nitrogen, phosphorus, and sulphur concentration and partitioning in beech ecotypes (Fagus sylvatica L.): phosphorus most affected by drought
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DOI：
10.1007/s00468-004-0335-x
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发表时间：
2004-05
期刊：
影响因子：
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通讯作者：
A. Peuke;H. Rennenberg
中科院分区：
文献类型：
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作者：
A. Peuke;H. Rennenberg
来自11个德国种源的不同干旱敏感性的山毛榉幼苗生长在盆中，并在温室中培养。本文件的目的是提供见解的吸收，运输和使用的常量营养素，因为知识的干旱对树木的营养的影响是低相比，水的关系。因此，元素组成，无机总含量的比例，以及碳，氮，磷，硫的根和地上部之间的分配进行了调查种源和干旱处理的影响。磷和磷酸盐浓度下降后，3周的干旱处理模拟夏季干旱期间的所有组织。干旱后根系碳含量增加，硝态氮含量下降，茎中氮含量下降，硝态氮含量增加。所观察到的磷和磷酸盐的影响进行了讨论，在较低的磷酸盐流动性在基板上，由于较低的水的可用性。组织中磷酸盐与磷的比率的降低表明使用液泡磷酸盐池来维持有机磷的稳态。所有常量营养素的分配不受干旱的影响，虽然磷和磷酸盐显着降低组织。在大多数的参数研究种源之间的显着差异。最近观察到的干旱敏感性的种源没有反映在浓度变化的强度或分配的大量营养元素的干旱超过种源。
Beech seedlings of different drought sensitivity originating from 11 German provenances were grown in pots and cultivated in a greenhouse. The present paper aims to give insights on uptake, transport and use of macronutrients, since the knowledge of drought effects on the nutrition of trees is low compared to water relations. Therefore, the elemental composition, the ratio of inorganic to total content, and the partitioning between roots and shoots of carbon, nitrogen, phosphorus, and sulphur were investigated as affected by provenance and drought treatment. Phosphorus and phosphate concentrations decreased in all tissues after a 3 week drought treatment simulating a summer drought period. In roots carbon increased and nitrate decreased, in stems nitrogen decreased but nitrate increased following drought. The observed effects on phosphorus and phosphate are discussed in terms of lower phosphate mobility in the substrate due to lower water availability. The decrease in the ratio of phosphate to phosphorus in the tissues suggests the use of vacuolar phosphate pools for maintaining organic phosphorus homeostasis. The partitioning of all macronutrients was not affected by drought, although phosphorus and phosphate were significantly lowered in tissues. In most of the parameters studied significant differences between provenances were found. The recently observed drought sensitivity of provenances was not reflected in the strength of concentration changes or partitioning of macronutrients by drought over provenances.