【摘要】 该文在单木液流测定的基础上 ,采用边材面积作为纯量 ,对京北山区水源保护林的主要树种油松、刺槐林进行由单木到林分耗水的推算 .结果发现 ,两树种边材面积与胸径之间均存在较高的相关性 ,两者之间的关系可以用幂模型得到很好的拟合 .通过实测标准地的胸径分布 ,可以推算出林地边材面积的分布 .利用热脉冲技术测定单木液流通量 ,实时推算林分的实际耗水量更多还原

【Abstract】 In this article, sapwood area is used as a scalar to extrapolate the stand water use from whole tree water use measured by heat pulse velocity recorder(HPVR). The tree species are Chinese pine (\%Pinus tabulaeformis\%) and black locust (\%Robinia pseudoacacia\%). A significant correlation between sapwood area and diameter at breast height (DBH) was found. The prediction model is well fitted by power model. On the basis of the prediction model, sapwood area can be calcalated by DBH. The sap flow density can be used to extrapolate stand water use by a series of mathematical models.更多还原