The Study Of Rainfall Redistribution And Influnce Factors In Korean Pine Forest

Broad-leaved Korean pine forest in Northeast Asia is the area of forests and the most representative forest ecosystem,the original Korean pine forest is a zonal plant communitie in the eastern part of China's northeast area.After predatory cutting,only a few small pieces of the original Korean pine forest remained in the Xiaoxing'an Mountains and the Changbai Mountains area in our country.Therefore,the research on hydrological effects of the original Korean pine forest is significant.We took the Liangshui National Nature Reserve as the study area,and the primitive Korean pine forest as the study object,the characteristics of the precipitation,the canopy interception,throughfall,stemflow in Korean pine virgin forest were studied by the long-term and located observations in order to understanding rainfall redistribution and influncing factors in Korean pine virgin forest.The mainly results were as follows:(1) During the whole growing season(2007,May to September) 46 rainfall were observed in Korean pine virgin forest,the total precipitation was 325.2mm,the rainfall mainly concentrated in July and August,particularly the most rainfall was in August.In all the rainfall, it was mainly light rains,which rainfall times accouted for 82.61%of total rainfall;the moderate rainfall times accouted for 15.22%;the heavy rainfall time was 0 and there was only 1 torrential rains.(2) The total canopy interception was 54.39mm,accounted for 16.72%of contemporaneous rainfall during the measuring period in Korean pine virgin forest,the average throughfall was 269.85mm and accounted for 82.98%,while the average stemflow was 0.97mm,accounted for 0.30%.(3) Using the actual rainfall datas observed in Korean pine virgin forest separately fired to canopy interception,thoughfall and stemflow,followed by firing equation: I=0.0009P~3-0.0781P~2+0.8836P-0.5789(R~2=0.8639) P_透=-0.0009P~3-0.0775P~2+0.1208P+0.5708(R~2=0.9818) P_干=-6E-06P~3+0.0006P~2-0.0044P+0.0081(R~2=0.9505) Note:P—rainfall P_透—thoughfall P_干—stemflow(4) In Korean pine virgin forest,the canopy interception,thoughfall and stemflow were increased with the increasing of rainfall,but the canopy interception rate was just the opposite; the canopy interception,thoughfall,stemflow and canopy interception rate presented decreasing trend with the increasing of rainfall intensity when the rainfall was identical,(5) Compare with rainfall and rainfall intensity,which were both important rainfall characteristic factors of rainfall redistribution,the results showed that rainfall played the most important role in rainfall redistribution of forest,its effects were greater than rainfall intensity.