ZHAO Yang,YU Xin-xiao,HUANG Zhi-ying,et al.Spatial Structure Characteristic of Platycladus orientalis Forests in Beijing Xishan Mountain[J].Research of Soil and Water Conservation,2011,18(04):183-188.
北京西山侧柏水源涵养林空间结构特征研究
- Title:
- Spatial Structure Characteristic of Platycladus orientalis Forests in Beijing Xishan Mountain
- Keywords:
- 3D laser scanning; cloud point; water conservation; spatial structure
- 分类号:
- S715
- 摘要:
- 应用地面三维激光扫描技术，采用"多站式"扫描方法来获取侧柏水源涵养林标准地内的林木树种、树高、胸径、胸高断面积等测树因子，利用混交度、大小比数、角尺度3个指标分析了北京西山林区侧柏水源涵养林公顷级样地的空间结构特征。结果表明：（1）侧柏林乔木层共包括21个树种，物种丰富度较高。其中，侧柏种群在密度和断面积累积量方面占有明显优势，是乔木层的建群种和优势种；（2）整个侧柏林混交度较低，平均混交度0.261，属混交不良的范畴。其中，侧柏、刺槐、火炬树以零度、弱度混交为主，分别占种群总株数的85%、58%、57%，其他伴生树种以中度、强度和极强度为主；（3）侧柏、油松、栓皮栎、元宝枫、刺槐种群在空间结构单元中以优势木、亚优势木和中庸木为主，分别占种群总株数的57%、67%、89%、66%和71%，其他树种优势度不明显；（4）侧柏林林分平均角尺度为0.542（大于0.517），说明该林分水平分布格局为聚集分布，但聚集程度较低。
- Abstract:
- This study investigated the application of terrestrial laser scanning for providing quantitative forest parameters at the plot-level by using ‘multi-stop’ scanning method for determining stand parameters such as the tree height, diameter, basal area, and other parameters. This paper described the spatial structural characteristics of one plot-level stand of Platycladus orientalis forests in Beijing Xishan mountain using mingling degree, neighborhood comparison and uniform angle index. The results showed that there were twenty-one species in arbor layer of Platycladus orientalis forests, among which, Platycladus orientalis had the obvious advantage in population density and basal area, being the dominant and constructive species of the tree layer. The average mingling degree of the whole stand was 0.261, suggesting the low mingling degree of stands. The dominant species such as Platycladus orientalis, Robinia pseudoacacia and Rhus typhina population were mainly none or less-mixed, accounting for 85%, 58%, 57% of the total plants of the populations, while the accompanying species generally presented moderate, intensity and high intensity. In the spatial structural units, Platycladus orientalis, Pinus tabulaeformis, Quercus variabilis, Acer truncatum and Robinia pseudoacacia were mainly dominant, sub-dominant, and intermediate trees, accounting for 57%, 67%, 89%, 66% and 71% of the total plants of the populations, respectively, while the advantages of other populations were not obvious. The uniform angle index value of Platycladus orientalis forests was 0.542 (greater than 0.517), indicating that the spatial pattern of the stands was the aggregative distribution, but the aggregation degree was not high and the aggregation scale was not large.
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备注/Memo
收稿日期:2010-12-30;改回日期:2011-2-18。
基金项目:十二五国家科技支撑项目“海河上游水源涵养林体系构建技术研究与示范”（2011BAD38B05）；国家林业公益性行业科研专项经费项目“典型森林植被对水资源形成过程的调控研究”（201104005）
作者简介:赵阳（1986- ），男，河北省枣强县人，硕士，主要研究方向：林业生态工程、水土保持。E-mail：zhaoyang1224@163.com
通讯作者:余新晓（1961- ），男，甘肃省平凉市人，教授，博士，研究方向为：森林水文、水土保持。E-mail：yuxinxiao111@126.com