紫金山麻栎林降水分配格局研究

Study on the distribution pattern of precipitation in Quercus acutissima forest of Purple Mountain

对紫金山栎林林冠截留、树干茎流与降水量之间的关系进行了研究。在观测的46场降水中,降水量达823.8 mm,林冠总截留量、树干茎流量和穿透雨量分别为207.95 mm、33.30 mm、582.55 mm,林冠截留率、树干茎流率和穿透率分别为25.24%、4.04%、70.71%。随着降水量的增大,林冠截留量、树干茎流量、穿透雨量及穿透率都有所增加,林冠截留率降低,树干茎流率在2～50 mm降水量级中逐渐增大,在>50 mm降水量级有所降低。林冠截留量与降水量之间呈幂函数关系,而树干茎流量、穿透雨与降水量之间呈线性相关。

The relationships between the canopy interception and the stemflow of Quercus acutissima forests and precipitation were studied in Purple Mountain.The results showed that in the total precipitation of 823.8 mm from 46 times observation,the canopy interception,the stemflow,and the throughfall of the forest was 207.95 mm,33.30 mm,and 582.55 mm,which accounted for 25.24%,4.04%,and 70.71% of the total precipitation,respectively.With the increase of precipitation,the canopy interception,the stemflow,the throughfall and the throughfall rate were increased gradually,while the canopy interception rate was decreased in a lower speed.the stemflow rate was increased when the precipitation was less than 50 mm.The canopy interception was a power-function relation with the precipitation amount,while the stemflow and the throughfall was linear correlation with the precipitation amount.