燕山北部山地人工针叶林及天然阔叶林植被层的降水截留量研究

Study on the interception of precipitation of coniferous plantationsand natural broad-leaved forests in mountain region of northern Yanshan

为了比较人工针叶林及天然阔叶林对降水的调控作用,利用泡枝法对燕山北部山地落叶松人工林及天然次生杨桦林植被层对降水的截留量进行了比较。研究结果表明:在各个年龄阶段,落叶松乔木林冠截留量都高于天然次生杨桦林。落叶松人工林幼龄林、中龄林、近熟林乔木林冠截留量分别为0.44mm、0.74mm、0.69mm,杨桦林则分别为0.25mm、0.33mm、0.49mm;但落叶松人工林灌木的截留量低于天然次生杨桦林;华北落叶松人工林植被层总截留量高于天然次生杨桦林,分别是0.48mm、0.78mm、0.74mm。随着林龄的增加,杨桦林林冠截留量有逐渐增加的趋势,幼龄林、中龄林、近熟林分别为0.41 mm、0.38 mm、0.76mm;但落叶松林到达近熟林时林冠截留量却有所下降。

In order to compare regulating effects of the artificial coniferous forests and natural broad-leaved forests on precipitation, method of branch soaking was used to compare inter- ception capacity of larch plantations and natural secondary birch forests in the mountain re- gion of northern Yanshan. Results indicated that, in every period, the canopy interception of larch was higher than the natural secondary birch forest. The canopy interception capabilities of larch young forests, middle-age forests, near-mature forests trees were 0.44 mm, 0. 74 mm and 0.69 mm, respectively, and those of birch forests were 0.25 mm, 0.33 mm, 0. 49 mm, respectively. However, the interception of larch shrubs was lower than natural second- ary birch forests. The total interception amount of larch forest vegetation layers was higher than the natural secondary birch forests. As the age prolonged, the trend of birch forest can- opy ability increased gradually and young forests, middle-age forests, near-matureforests trees were 0.41mm, 0. 38mm and 0.76mm respectively, while the canopy intercep tion ability of larch forests decreased when they were near-matured.