| 摘要: |
| 【目的】了解不同演替时期落叶阔叶林空间结构和稳定性的差异以及两者之间的关系。【方法】利用混交度、角尺度和大小比数3个空间结构参数及稳定度指数方法，分析侧柏栎树混交林(PQM)、栎树混交林(PM)和黄连木栎树混交林(QPM)3种处于不同演替时期的森林群落的空间结构和群落稳定性特征。【结果】1）PQM、PM和QPM 3种森林群落的混交度分别为0.506，0.790和0.678，PM属于极强度混交，PQM和QPM属于强度混交；角尺度分别为0.459，0.522和0.447，PM属于团状分布，PQM和 QPM属于均匀分布；大小比数分别为0.430，0.501和0.507,3种群落的生长都处于优势状态。2）PQM、PM和QPM 3种群落的稳定性指数分别为－0.219，0.352，－0.134，以PM最高。【结论】1）随着演替的进行，林木的混交程度和水平分布格局呈现先上升后下降的趋势，并以侧柏栎树混交林最低；林木的大小分化程度呈增大趋势。2）栎树混交林的稳定性最强，侧柏栎树混交林的稳定性最弱，稳定性最高的群落并没有出现在顶级群落。 |
| 关键词: 混交度 角尺度 大小比数 群落稳定性 |
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| 基金项目:国家林业公益性行业科研专项(201104075) |
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| Spatial structure and stability of Pinus and Quercus mixed forest |
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| Abstract: |
| 【Objective】This study aimed to identify the relationship between spatial structure and stability of Pinus and Quercus mixed forest.【Method】The spatial structure and stability of communities in 3 different successional stages,including Platycladus orientalis and Quercus variabilis mixed forest,P.orientalis mixed forest and Q.variabilis and P.orientalis mixed forest was analyzed using stability index and 3 spatial structure parameters:mingling degree,uniform angle index and neighborhood comparison.【Result】The mingling degrees of three communities,P.orientalis and Q.variabilis mixed forest,P.orientalis mixed forest and Q.variabilis and P.orientalis mixed forest,were 0.506,0.790 and 0.678,respectively.P.orientalis and Q.variabilis mixed forest was pole strong mixed while others were strong mixed.The angle indexes of 3 communities were 0.459,0.522,0.447,respectively.P.orientalis and Q.variabilis mixed forest was cluster distribution,and others were uniform distribution.The neighborhood comparisons of three communities were 0.430,0.501 and 0.507,respectively.All of the communities were dominant.The stability degree indexes of 3 communities were －0.219,0.352 and －0.134,respectively.Among them the value of the P.orientalis mixed forest was the highest.【Conclusion】1) With the processing of succession,the mingling degrees and patterns of horizontal distribution raised first and decreased afterwards and P.orientalis and Q.variabilis mixed forest was the lowest.2) The P.orientalis mixed forest had the highest forest stability while the P.orientalis and Q.variabilis mixed forest had the lowest,indicating that the highest forest community stability did not occur in the climax community. |
| Key words: mingling degree angle index neighborhood comparison community stability |
