东北白桦(Betula platyphylla Suk.)和枫桦(B.costata Tautar.)立木的‘水心材’是很普遍的。采伐现场的一些工人和技术人员认为,桦木的树液很多,冬季树液不流动,便形成‘水心’。这种木材就称为水心材。这种解释是缺乏科学根据的。但水心是怎样形成的,或至少水心究竟是病理现象还是生理现象,是一个需要明确的问题。1953年冬季和1954年夏季,林业部、中国科学院长春综合研究所和该院真菌植病研究室、林业部林业科学研究所及东北森林工业管理局等有关单位,进行了白桦和枫桦的 Betula platyphylla Suk. And B.costata Tautar. Some workers and technicians at the logging site believe that there are many birch tree barks and the winter tree bark does not flow, forming a ’water heart’. This kind of wood is called water heartwood. This explanation is a lack of scientific basis. However, water is how to form, or at least water and water is a pathological phenomenon or physiological phenomenon, is a need to clear the problem. The winter of 1953 and the summer of 1954, the Ministry of Forestry, Changchun Institute of integrated Chinese Academy of Sciences and the Institute of Fungi plant, Forestry Research Institute of Forestry and the Northeast Forest Industry Authority and other relevant units, the birch and Maple Leaf