Rainfall redistribution in subalpine Quercus aquifolioides forest in upper reaches of Minjiang River

Based on the meteorological data from June to September 2007,the rainfall redistribution in subalpine Quercus aquifolioides forest in the upper reaches of Minjiang River was investigated by permanent plot method.The results showed that the total rainfall outside the forest was 486.7 mm,and the throughfall,stemflow,and canopy interception accounted for 82.6%,0.9%,and 16.5% of the total rainfall,respectively.The throughfall and stemflow had significant linear relationships with rainfall(P0.01,n=49),and the relationships of throughfall ratio and stemflow ratio with rainfall could be described with nonlinear curves.When the rainfall outside the forest was more than 3.2 mm,stemflow would happen,and there existed a significant exponential(R2=0.623)relationship between the stemflow volume and the tree basal area.The canopy interception rate decreased hyperbolically with the increase of rainfall,being significantly negatively correlated with the rainfall amount,duration,and intensity as well as the air relative humidity during rainfall(P0.01,n=49),but positively correlated with wind velocity(P0.01,n=49).