武夷山甜槠常绿阔叶林林分降水分量特征

2004年对武夷山甜槠林不同水文分量定位观测,探讨甜槠林森林水文与降水的关系 .结果表明:1)2004年共发生降水219次,年降水量1 767.4 mm,穿透水、茎流量和林冠截留量分别为1 304.9、245.0和217.5 mm;穿透率、茎流率和截留率分别为73.8%、 13.9%和12.3%;2)同次降水中,林内不同位置的穿透雨量差异显著,穿透水量与大气降水量之间存在明显的线性关系;3)随着胸径的增加,茎流量减小,形成茎流的时间推迟;4)当降水量<202.1 mm时,林冠截留量随着降水量的增加而增加;当降水量超过202.1 mm后,林冠截留量趋于定值52.5 mm.

Characteristics of Precipitation in Castanopsis eyrei Broad-Leaved Evergreen Forest of Wuyi Mountain

Hydrological effects of Castanopsis eyrei forest in Wuyi Mountain were studied in 2004.The results indicated:1)There were 219 precipitations in 2004 and the total precipitation during this period was 1 767.4 mm,throughfall,stemflow and interception was 1 304.9,245.0 and 217.5 mm,respectively,and which accounted for 73.8%,13.9% and 12.3% of precipitation,respectively;2)The throughfalls at different places in the forest were different significantly for the same precipitation,furthermore the relationship between throughfall and total precipitation was linear;3)With the DBH increasing,the stemflow decreased,and the time taking stemflow was postponed;4)When precipitation was lower than 202.1 mm,the interception increased with precipitation increasing,when precipitation was higher than 202.1 mm,the interception inclined to 52.5 mm.