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1、浅谈省清原县抚育间伐经营方式与林分密度、立地条件的关系摘要森林在生长的过程中，会受到各种因素的影响，而天然林则因为各种影响导致林木密度不均匀，因此需要通过科学的抚育间伐，将天然林中不具备生长优势的劣质林木剔除。那么根据不同的林分密度，不同的立地条件，如何选择合理的不同强度间伐，为抚育经营提供优势。本文以省清原县林场为研究地点，通过设置不同的标准地调查，进行对比分析，试图找出最合理的抚育经营方式。针对林场的具体情况，在不同的林分密度下，不同的立地条件下，采用不同的抚育经营方式。并对林场目前在经营过程中存在的问题进行具体的分析，提出了改善的相关建议，为今后当地林业工作者采取适当合理的抚育经营措施提
2、供了参考价值。主要的研究结果如下：(1) 设置不同的林分密度，林木生长的林分因子呈现不同的数据。在标准地设置的100株/hm，200株/hm，300株/hm，400株/hm，500株/hm五个不同林分密度中，100株/hm的林分密度下林木生长的最好。根据数据分析发现，林分密度对平均胸径、树冠结构、树高等均有不同程度的影响。当林分密度持续增加时，林木的平均胸径和树冠结构减小，树高则上升。(2) 坡度、坡位、坡向等地形因子和土层厚度、土地类型等土壤因子是影响城郊林场人工林林木生长的主要立地条件。林地坡度变化不大，林地坡位导致土壤肥力不同，林地坡向使日照时间长短和强度有差异。林地坡度对林分生长的平均
3、胸径、树冠结构、树高没有什么影响，二者关系不大。林地坡位对林分生长的平均胸径、树冠结构、树高有较大影响，当林地坡位上升时，平均胸径、树高下降，具有负相关性质。树冠结构上升，具有正相关性质。林地坡向对林分生长的平均胸径、树高有较大影响，对树冠结构没有影响。当林地坡向上升时，平均胸径、树高上升，具有正相关性质。(3) 抚育间伐对城郊林场人工林的土壤物理性质、化学性质、土壤酶活性等有较大影响。抚育经营不同的间伐强度，土壤的温度，湿度不同。抚育经营不同的间伐强度，Ph值、有机质。磷含量等数据不同。抚育经营不同的间伐强度，测定的土壤酶活性不同。关键词：抚育经营；林分密度；立地条件；人工林抚育；土壤酶活性
4、；Abstract: in the process of forest growth, will be affected by various factors, and natural forest because of various effects led to tree density, so through the thinning of science, will growth advantage to eliminate the unqualified inferior forest in natural forest. Then, according to different s
5、tand density and different site conditions, how to select reasonable thinning of different intensity to provide advantages for tending management. This paper takes the suburb in Qingyuan County of Liaoning province forest farm as research sites, by setting the standard of different investigation, co
6、mparative analysis, trying to find the most reasonable way of tending operations. In view of the specific conditions of suburban forest farms, different tending and management methods were adopted under different stand density and different site conditions. And specific analysis of the suburban fore
7、st currently existing in the management of the problem, put forward related suggestions to improve and provide the reference value for the local forestry workers take proper measures of tending operations. The main results are as follows:(1) different stand density is set up, and the stand factor of
8、 tree growth is different. 100 strains of hm set in the standard, 200 strains of /hm ，300 strains of/hm , 400 strains of /hm , 500 strains of/hm different stand densities. According to the data analysis, the stand density has different effects on the average DBH, crown structure, tree height and so
9、on. When the stand density increased continuously, the average DBH and crown structure of trees decreased, but the tree height increased.(2) the soil factors such as slope, slope, slope and other soil factors, such as soil thickness and land type, are the main site conditions affecting the growth of
10、 plantation forest in suburban forest farm. The slope of woodland forest slope caused little change, soil fertility, woodland slope towards the sunshine time and strength are different. The forest slope had no influence on the average DBH, crown structure and tree height of the growth of the stand,
11、and the two had little relationship. The slope position of forest land has a great influence on the average DBH, crown structure and tree height. When the slope of forest land rises, the average DBH and tree height have negative correlation. The rise of crown structure has positive correlation prope
12、rty. The forest slope has a great influence on the average DBH and tree height, but has no influence on the crown structure. When the slope of forest land rises, the average DBH and tree height have positive correlation.(3) tending and thinning had great influence on soil physical properties, chemic
13、al properties and soil enzyme activities in plantations of suburban forest farms. Tending to manage different thinning intensities, soil temperature, and humidity are different. Different thinning intensities, such as Ph and phosphorus content, are different in tending and management. The soil enzym
14、e activities measured by different thinning intensities were different between tending and management.Key words: tending management; stand density; site condition; tending of plantation;soil enzyme activity独 创 性 声 明本人声明所呈交的论文是我个人在导师指导下进行的研究工作及取得的研究成果。尽我所知，除了文中特别加以标注和致的地方外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含
15、为获得农业大学或其它教育机构的学位或证书而使用过的材料。与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示了意。研究生签名： 时间： 年 月 日导师签名： 时间： 年 月 日关于论文知识产权和使用授权的说明本论文的知识产权为农业大学所有。本人完全了解农业大学有关保留、使用学位论文的规定，即：学校有权保留送交论文的复印件和磁盘，允许论文被查阅和借阅，可以采用影印、缩印或扫描等复制手段保存、汇编学位论文。同意农业大学可以用不同方式在不同媒体上发表、传播学位论文的容。学位论文中的所有容不经农业大学授权不得以任何方式擅自对外发表。（的学位论文在解密后应遵守此协议）研究生签名： 时间： 年 月 日导师签名： 时间： 年 月 日目 录摘 要1英文摘要3第一章 绪论51.1研究背景51.2研究目的和意义51.3国外研究综述61.3.1国外关于抚育间伐的研究81.3.2国关于抚育间伐的研究101.4抚育间伐的作用141.5抚育间伐对人工林土壤碳的影响141.6立地条件对林分生长及抚育经营的影响151.7林分密度对林分生长及抚育经营的影响16第二章 抚育间伐效果研究容和方法162.1省清
