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为探究多维地形因素对林窗分布的影响,以天童20hm2常绿阔叶林动态监测样地内的林窗为对象,结合地理信息系统软件,分析了林窗空隙率、林窗密度以及林窗面积在海拔、坡度、坡向、坡形、坡位5种地形因子下的分布格局.结果表明:该样地林窗空隙率为13.1%,林窗密度为9.5个·hm-2,林窗平均面积为137.82m2;因高海拔台风干扰的强度较大,高海拔段(≥500m)林窗的空隙率和密度显著大于中低海拔段(<500m);台风带来的强降雨极易引起小范围滑坡,使得沟谷的林窗空隙率和密度显著大于侧坡,林窗平均面积显著大于侧坡和山脊.台风及其带来的强降雨是造成林窗在海拔及坡位梯度上具有显著性差异的主要原因.
In order to explore the influence of multi-dimensional terrain factors on the distribution of gap windows, the gap gaps, gap density, and gap area in Tianmu 20hm2 evergreen broad-leaved forest dynamic monitoring plots were studied with the GIS software. The results showed that the gap percentage of the forest gap was 13.1%, the gap density was 9.5 · hm-2, the average of the gap width With an area of 137.82m2. Because of the high intensity of typhoon disturbance at high altitude, the porosity and density of the forest window at high altitude (≥500m) were significantly larger than those at the middle and low elevation (<500m). The heavy rainfall brought by typhoon could easily cause small Range landslides caused the gaps and densities of glade gaps in the valleys to be significantly larger than those in the side slopes, and the average area of the windings was significantly larger than that of the side slopes and ridges. Typhoon and its heavy rains resulted in significant differences in the alpine gradient and slope gradient The main reason for the difference.