Birch sap is colourless or slightly opalescent and is traditionally drunk in spring. Currently, birch sap is becoming more important in the market sector as well as to pharmacy companies due to its biochemical composition and use in a wide variety of products. To extract good quality sap using birch resources in a sustainable way, there is a need to investigate the influence of the dendrometric parameters of birch trees and soil properties on the quantity and chemical composition of birch sap. This study is performed in five silver birch (Betula pendula Roth) forest stands growing in Histosol, Luvisol and Arenosol with different moisture and nutrient contents. The results indicated that the most productive silver birch trees for sap harvesting were taller than 28 m, had a diameter at breast height over 40 cm and a crown base height greater than 19 m. Additionally, the highest quantity of birch sap was harvested from trees growing in well-aerated mineral soils (Arenosol and Luvisol) with normal moisture content. However, the sweetest birch sap was harvested from trees growing in nutrient-rich organic (undrained peatland Histosol) and temporarily flooded mineral (Luvisol) soils.

中文翻译：

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不同土壤中生长的白桦（Betula pendula Roth）树汁液的数量和生化组成

桦树汁无色或微乳白色，传统上在春季喝醉。当前，桦树汁由于其生化成分和在多种产品中的使用，在市场领域以及制药公司中变得越来越重要。为了以可持续的方式利用桦树资源提取高质量的汁液，有必要研究桦树的树木密度参数和土壤性质对桦树液的数量和化学组成的影响。这项研究是在五个白桦（Betula pendula）中进行的。Roth）林生长在不同水分和养分含量的Histosol，Luvisol和Arenosol中。结果表明，用于树液收获的生产力最高的白桦树高于28 m，胸高处直径大于40 cm，树冠基部高度大于19 m。此外，从生长在具有正常水分含量的充分通风的矿质土壤（Arenosol和Luvisol）中的树木中收获了最高数量的桦树汁。但是，最甜的桦树汁是从生长在营养丰富的有机（不排水的泥炭地组织藻）和暂时淹没的矿物（Luvisol）土壤中的树木中收获的。