北京密云水库集水区刺槐人工林空间结构分析
Spatial structure of Robinia pseudoacacia plantation in Miyun Reservoir Watershed of Beijing.
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摘要: 2006年,在北京市五座楼林场选择以刺槐为优势树种的人工林为研究对象,利用混交度大小比数和角尺度3 种结构参数,结合树种组成,分析了刺槐人工林林分空间结构。结果表明:刺槐人工林的树种混交度以零度混交(Mi=0)和弱度混交(Mi=0.25)为主,树种的平均混交度为0.158,说明刺槐林的树种空间配置简单,林分中树种混交程度较低;林木大小比数分布存在波动性变化,林分中优势、亚优势和中庸状态分布的个体比例相差不大,乔木层树种稳定性大;在角尺度研究中,相对空间结构单元而言,个别等级林木分布频度变化幅度较大,分布格局呈集群分布。Abstract: In 2006, to analyze the spatial structure of Robinia pseudoacacia plantation, the plantation predominated by R. pseudoacacia located in Wuzuolou Forest Farm of Beijing was taken as the study object, and three structural parameters, i.e. mingling degree, neighborhood comparison and uniform angle index, were used. The results showed that mingling degree of R. pseudoacacia plantation was mainly zero(Mi=0) and relatively weak(Mi=0.25), the mean value was 0.158, indicating the simple spatial allocation and poor mixing of different tree species in this plantation. The distribution of neighborhood comparison changed with a fluctuant pattern, and the proportions of dominant, sub-dominant and middle stands differred little, and the stability of species in the arborous layer was good. As for uniform angle index, considering the spatial structure units, the frequency of some individual tree classes changed in a relatively large range and the forest plantation presented a gathering distribution pattern. 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