森林自然度的计量模型研究

发布时间：2018-04-26 00:34

  本文选题：森林自然度 + 林层指数　； 参考：《中南林业科技大学》2013年硕士论文

【摘要】：由于全球森林生态系统严重退化的现状,如何保护和恢复森林生态系统已经成为世界关注的焦点。而将原生植被群落与现实植被群落在群落特征、生境状况等方面作对比,是恢复森林的基础。因此,评价二者的差异,即计算森林自然度是恢复退化的森林生态系统工作中的重点,是天然林管护和人工林近自然化改造的关键所在。 本文属于国家自然科学基金“洞庭潮湿地森林生态系统经营的空间途径研究(项目编号31070568)”、林业公益性行业科研专项“南方集体林区次生林抚育间伐与高效利用技术研究(项目编号201004032)”和湖南省自然科学基金资助项目“基于多目标优化的水源涵养林空间结构模式研究(项目编号10JJ2022)”的部分研究内容。本研究在综合国内外森林自然度研究理论的基础之上,通过运用粗糙集理论和变异系数法,构建了森林自然度的计量模型,然后以龙虎山林场青i混交林、桂花林场苦槠混交林和擦木混交林为研究对象,对三种林分的森林自然度进行了计算,并给出了近自然经营的建议。最后得到结论如下 (1)提出了林层指数、自然构成指数、干扰指数三个新指标。从而能更准确地反映林分的垂直分布格局、描述森林的演替方向和分析森林受干扰的程度。 (2)提出了一种基于粗糙集理论的森林自然度计量模型。该模型利用粗糙集的属性约简思想对指标进行筛选。 (3)对森林自然度的计量模型进行了实例分析,以龙虎山林场青i混交林、桂花林场苦槠混交林和檫木混交林为研究对象,进行了森林自然度计量模型的运算,得出三种林分的森林自然度分别是0.741、0.727、0.593,分别属于森林自然度等级中的Ⅱ级、Ⅱ级、Ⅲ级。
[Abstract]:Due to the serious degradation of global forest ecosystem, how to protect and restore forest ecosystem has become the focus of the world. Comparing primary vegetation communities with real vegetation communities in community characteristics and habitat conditions is the basis for forest restoration. Therefore, the evaluation of the difference between the two is that the calculation of forest naturalness is the key point in the restoration of degraded forest ecosystem, and the key to natural forest management and the near naturalization of artificial forest. This paper belongs to the National Natural Science Foundation of China, "Research on Spatial approaches to the Management of moist Forest ecosystem in Dongting (Project No. 31070568)". Forestry Public Welfare Industry Scientific Research Project "Research on thinning and efficient Utilization of Secondary Forest in Southern Collective Forest region (Project No. 201004032)" and "Water Conservation Forest Space Conservation based on Multi-objective Optimization" supported by Natural Science Foundation of Hunan Province Part of the study on Interstructure Model (item No. 10 JJ 2022). On the basis of synthesizing the theories of forest naturalness at home and abroad, the measurement model of forest naturalness was constructed by using rough set theory and variation coefficient method. The forest naturalness of three kinds of forest was calculated, and the suggestion of near natural management was given. The mixed forest of Castanopsis eyrei and mixed forest of wood and wood in Osmanthus fragrans forest farm were studied. The final conclusion is as follows 1) three new indexes of forest layer index, natural composition index and disturbance index are put forward. Thus it can more accurately reflect the vertical distribution pattern of forest describe the succession direction of forest and analyze the degree of forest disturbance. A forest naturalness measurement model based on rough set theory is proposed. The model uses the attribute reduction idea of rough set to filter the index. (3) the measurement model of forest naturalness was analyzed by examples. The calculation of forest naturalness measurement model was carried out by taking the green mixed forest, Castanopsis eyrei mixed forest and sassafras mixed forest in Longhu Mountain Forest Farm as the research objects. The results showed that the forest naturalness of the three stands was 0.727270.593, which belonged to 鈪，

本文编号：1803707