Abstract:In order to analyze the rainfall redistribution in forest canopy and the spatial variation of the throughfall in phyllostachys edulis stands, a total of 72 gauges were randomly set up within a 30 m×30 m sample plot of a phyllostachys edulis stand, which was located in the Jinyun Mountain National Nature Reserve at Chongqing, and 6 standard trees were selected to observe the stem flow. Altogether 18 rainfall events were monitored from May to August, 2017. The results showed that the total volume of interception, throughfall and stem flow of all the rainfall events was 32.76, 208.1 and 10.97 mm respectively, accounting for 13.00%, 82.64% and 4.36% of the total rainfall, respectively. A logarithmically increasing function was fitted between throughfall ratio and rainfall depth. The coefficients of spatial variability of throughfall showed a power function relationship with both rainfall volumes and rainfall intensities. The impacts of leaf area index (LAI) on throughfall ratio decreased with the rising rainfall depth. A significantly negative correlation was found between the throughfall ratio and LAI when rainfall was less than 10 mm. The coefficients of variance of throughfall among all the 18 rainfall events (CVT) at different gauges changed from 19.2% to 47.7%. The spatial distribution pattern of CVT was in accordance with the spatial distribution pattern of phyllostachys edulis densities, but showed no significant relationship with the distribution of LAI. The monitoring points with larger throughfall tended to be located at the edge of Pyllostachys edulis canopy.