| 燕山山地白桦林的空间结构研究 |
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| 引用本文： | 赵海玉,;郑春雅,;刘相兵.燕山山地白桦林的空间结构研究[J].河北林果研究,2014(3):233-236. |
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| 作者姓名： | 赵海玉 ;郑春雅 ;刘相兵 |
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| 作者单位： | [1]张家口黑龙山林场,河北赤城075500; [2]河北农业大学林学院,河北保定071000 |
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| 基金项目： | 河北省发改委项目“张家口天然次生林经营诊断与结构调整技术研究”（201322）;河北省科技厅科技支撑项目“燕山北部山地典型森林生态系统碳汇功能及其对森林经营措施的响应（10236728）”;河北省林业厅项目“木兰林区中幼龄林抚育经营技术及其效果研究”（1217441）. |
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| 摘 要： | 为了解燕山山地白桦天然次生林的空间结构,以河北省孟滦林场和黑龙山林场的白桦天然次生林为研究对象,对其角尺度和混交度等空间结构特征参数进行了研究。结果表明:孟滦林场和黑龙山林场的白桦天然次生幼龄林均呈聚集分布,平均角尺度分别为0.58和0.55,孟滦林场的白桦天然次生幼龄林的聚集程度高于黑龙山林场;2个地区的白桦天然次生中龄林也呈明显的聚集分布。孟滦林场白桦天然次生林平均混交度为0.32,混交树种只有2个;黑龙山林场平均混交度为0.47,混交树种达到5个。
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| 关 键 词： | 燕山山地 空间结构 角尺度 混交度 |
Study on spatial structure of birch forests in Yanshan mountains |
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| Institution: | ZHAO Haiyu, ZHENG Chunya, LIU Xiangbing (l Heilongshan Forest Farm of Zhangjiakou, Chicheng 075500, China 2 College of Forestry, Agricultural University of Hebei, Baoding 071000, China) |
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| Abstract: | In order to understand the spatial structure of birch natural secondary forests forest in Yanshan mountains , the birch natural secondary forests in Heilongshan Forest Farm and Mengluan Forest Farm were studied ,using angle index and mingling degree .The results showed that the young forests in Mengluan Forest Farm and Heilongshan Forest Farm were in aggregated distribution ,and the average angle index was 0 .58 for Mengluan Forest Farm and 0 .55 for Heilongshan Forest Farm .The aggregation of Mengluan Forest Farm was higher than that of Heilongshan Forest Farm . The middle-age birch natural secondary forests in both farms also had aggregated distribution . Moreover , the average mingling degree of the birch natural secondary forests in Mengluan Forest Farm was 0 .32 , with 2 mixed tree species ,and that in Heilongshan Forest Farm was 0 .47 with 5 mixed tree species . |
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| Keywords: | Yanshan mountains spatial structure angle index mingling degree |
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