空间结构单元的侧柏林群落特征分析

Community Characteristics of Platycladus orientalis Based on Structure Unit

为了提高徐州市石灰岩山地侧柏人工林的生态和景观质量,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,对比分析了云龙山侧柏林和皇藏峪森林公园内5种落叶阔叶林的空间结构。结果表明:侧柏林的零度和弱度混交比例高于落叶阔叶林,中度、强度和极强度混交的比例较小;从林木大小分化程度来看,侧柏在空间大小对比上占有一定的优势,其他样地内树种分化明显;从林木分布格局来看,侧柏林多呈聚集或随机分布。

Mingling degree,neighborhood comparison,and uniform angle index were used to study the spatial structure of Platycladus orientalis plantations in Yunlong Mountain and five deciduous broadleaved forests in Huangcangyu National Forest Park,aimed to improve the quality of ecological landscape of P. orientalis plantation in limestone mountainous areas in Xuzhou. The mingling degree of P. orientalis plantations was lower than that of the deciduous broadleaved forests,which indicates that the dominant species are mainly none-or less-mixed. P. orientalis had an advantage over other species in neighborhood comparison,and serious differentiation was found in both dominant species and suppressed species in other plots. Uniform angle index shows that the tree spatial distribution patterns for P. orientalis plantations are clumped or random.