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

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 interception capacity of larch plantations and natural secondary birch forests in the mountain region 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 secondary 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 canopy ability increased gradually and young forests,middle-age forests,near-mature forests trees were 0.41mm,0.38mm and 0.76mm respectively,while the canopy interception ability of larch forests decreased when they were near-matured.