| 摘要: |
| 【目的】对甘肃小陇山林区2种干扰类型锐齿栎次生林林分的结构特征进行分析，探讨不同林分结构分析方法提供的信息，为锐齿栎次生林的保护、恢复和结构优化调整提供理论依据。【方法】以甘肃小陇山林区典型的长期未经人为干扰的样地（王安沟）和经过“次生林综合培育”技术经营后恢复的锐齿栎次生林样地（小阳沟）为例，运用林分结构基本特征分析方法及基于相邻木空间关系的结构参数、标记混交度和大小分化二阶特征函数，分析不同干扰模式下锐齿栎次生林林分的结构特征。【结果】2个样地的林分基本结构特征有一定差异，小阳沟林分的密度较小，平均胸径、断面积较王安沟林分大，但树种多样性较低，二者的林木分布格局和混交度分布检验差异也不显著；标记混交度和大小分化二阶特征函数体现出2个样地的林木个体大小分布和不同树种间的关系存在较大差异，小阳沟林分在0～10 m尺度上同种聚集趋势十分明显，林木大小分化在整个研究尺度上随机分布；王安沟林分在0~10 m尺度上同种聚集的强度较小，林木在7～12 m尺度上表现为相同大小林木的聚集趋势先增加后趋向随机分布。【结论】王安沟林分是自然演替的结果，经营措施对小阳沟林分结构起到了一定的调整作用。对于次生林而言，合理的经营可以促进林分生长和林分质量提高。标记二阶特征函数能够提供林分内树种分布和大小分化随尺度变化的关系，并对林分结构特征形成的生态过程具有一定的解释能力。 |
| 关键词: 锐齿栎 次生林 林分结构 标记二阶特征函数 小陇山 |
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| 基金项目:国家自然科学基金面上项目“基于相邻木关系的林分结构多样性研究”（31670640）；国家留学基金管理委员会访问学者项目（201703270006） |
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| Stand structure characteristics of two Quercus aliena secondary forests on the Xiaolongshan Forest Area |
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ZHAO Zhonghua,HUI Gangying,LIU Wenzhen,et al
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| Abstract: |
| 【Objective】Different forest structure analysis methods were used to analyze the structural characteristics of two Quercus aliena secondary forests in the Xiaolongshan Forests Region and the forest structural information was compared to provide basis for protection,restoration and structural optimization of secondary forests.【Method】Two Q. aliena secondary forest plots were analyzed,the Wangangou plot was undisturbed for long-term and the Xiaoyanggou plot was restored and managed by comprehensive cultivation technology.The basic characteristics analysis method,spatial structure and mark second order characteristics function of forest structure were used to analyze the characteristics of the two Q. aliena secondary forests.【Result】There were certain differences in the structural characteristics of the two plots.The density and tree species diversity of Xiaoyanggou plot were smaller than that of Wangangou plot,while the mean DBH and basal area of Xiaoyanggou plot were larger than that of Wangangou plot.There was no significant difference in the diameter distribution pattern and mingling distribution of the two forests.The mark mingling and mark size differentiation second order characteristics results showed that there were significant differences of the two plots.The trend of same species aggregation in 0-10 m scale was obviously and sizes of individual trees were randomly distributed in Xiaoyanggou plot.The Wangangou plot also had a trend of homogeneous aggregation in the scale of 0-10 m,with smaller strength compared to Xiaoyanggou plot.The size differentiation showed that clustering tendency of similar size tree increased with distance and to be random in the 7-12 m scale.【Conclusion】The structure characteristics of the Wangangou forest was the result of natural succession and management measures played an important role in the forest structure of Xiaoyanggou secondary forest.Reasonable management can accelerate growth of trees and promote quality of secondary forests.The mark second order characteristics function can provide the relationship between tree species distribution and size differentiation in different scales and has certain ability to explain the ecological processes of forest structural characteristics. |
| Key words: Quercus aliena secondary forests stand structure mark second order characteristics function Xiaolongshan |
