Regulation of Sap Release when Tapping Betula pendula Roth

IF 0.2 Q4 FORESTRY

Lesnoy Zhurnal-Forestry Journal Pub Date : 2023-08-01 DOI:10.37482/0536-1036-2023-4-180-189

A. Gryazkin, Minh Anh Hoang, T. Thanh, D. Danilov, D. Zaytsev

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Abstract

The study showed a correlation between the intensity of sap release by birch trees and the trunk diameter, degree of crown development, and tree age. In addition to the characteristics of trees, sap release intensity also depended on weather conditions and tapping methods. The study object was a mature birch stand with blueberry ground cover (Kirishi forestry unit of the Leningrad region, Russia). The composition of the stand consisted of birch (65 %), spruce (21 %), aspen (8 %), alder (3 %), elm (2 %), and maple (1 %); the basal area was 0.6. The projective cover was 0.73. The average age, diameter and height were 76 yrs, 25.0 cm and 24.3 m, respectively. Tapping was carried out by the closed method. The tapping channels were 30–40 cm above the root neck. The intensity of sap release was found to depend on the number of channels and their location. The maximum intensity of sap release from one tapping channel was 285 mL/h, depending on the trunk diameter and tree age. The intensity of sap release varied throughout the day: it increased in the morning and early afternoon (until 1–2 pm), and decreased in the late afternoon. At night, sap release intensity was the lowest, or it stopped completely regardless of the tree's age, degree of crown development, and trunk diameter. At the average daily temperature between +3 and +6 °С in moky weather, each tree produced 0.54–1.37 L of sap per day, and at a higher temperature in sunny weather, 2.50–6.22 L per day. The higher the air and soil temperatures, the more intense the sap release. At the air temperature of –3.0 °С, the sap freezes. When the average daily air temperature stays above +10.0 °С for several days, the sap begins to ferment. For citation: Gryazkin A.V., Danilov D.A., Zaytsev D.A., Hoang Minh Anh, Thanh Tran Trung. Regulation of Sap Release when Tapping Betula pendula Roth. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 4, pp. 180–189. (In Russ.). https://doi.org/10.37482/0536-1036-2023-4-180-189

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采伐白桦树液释放的调控

研究表明，桦树的汁液释放强度与树干直径、树冠发育程度和树龄呈正相关。除了树木的特性外，树液的释放强度还取决于天气条件和采伐方法。研究对象是一个成熟的有蓝莓覆盖的桦树林分(俄罗斯列宁格勒地区的Kirishi林业单位)。林分组成为桦木(65%)、云杉(21%)、白杨(8%)、桤木(3%)、榆树(2%)和枫木(1%);基底面积为0.6。投影覆盖率为0.73。平均年龄76岁，平均直径25.0 cm，平均高度24.3 m。采用封闭法攻丝。攻丝通道位于根颈上方30 ~ 40 cm。汁液释放的强度取决于通道的数量和它们的位置。在不同的树干直径和树龄条件下，每个攻丝通道的最大液量为285 mL/h。汁液释放的强度在一天中变化，上午和下午早些时候(直到下午1-2点)增加，下午晚些时候减少。在夜间，无论树龄、树冠发育程度和树干直径大小，树液释放强度最低或完全停止。在多烟天气，平均气温在+3 ~ +6°С之间时，每棵树每天产生0.54 ~ 1.37 L的汁液，在阳光充足的天气，每棵树每天产生2.50 ~ 6.22 L的汁液。空气和土壤温度越高，树液的释放就越强烈。在-3.0°С的空气温度下，树液结冰。当每日平均气温保持在+10.0°С以上数天时，汁液开始发酵。引文:Gryazkin a.v.， Danilov D.A, Zaytsev D.A, Hoang Minh Anh, Thanh Tran Trung。采伐白桦树液释放的调控。俄罗斯林业杂志，2023年第1期。4，第180-189页。(俄国人)。https://doi.org/10.37482/0536-1036-2023-4-180-189

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Lesnoy Zhurnal-Forestry Journal FORESTRY-

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