环保毕业论文:天津市典型经济林木滞尘能力研究--前言

　　摘  要

　　本文通过实地采样方法对天津市典型经济树种的滞尘能力做了研究，并以常用绿化树种作为对比。对各植株的基本特征进行了调查以作为研究的辅助资料。通过实验分别测定出了个植株的单位叶面积滞尘量、单位叶重滞尘量、单株滞尘量。得出以下结论：不同树木滞尘量存在差异是由于各树木本身生物学特性和其生长的自然环境的不同。城市绿化应优先选择滞尘能力较强的树种，经济树种在滞尘能力方面与现有绿化树种存在差距，所调查经济树种单株叶面积在4.84～992.85 m2之间；单位叶面积滞尘量在0.8～1.3 mg/cm2之间；单株滞尘量在0.055～5.148kg之间。经济树种滞尘能力强的有：柿树、杏树、核桃、银杏等树种。并提出了：因地制宜的选择滞尘经济树种、综合考虑经济树种对其它污染物的抗性、大力发展立体绿化的建议。

　　Study on Dust Catching Ability of Typical Economic Tree in Tianjin

ABSTRACT

This thesis uses the method of the on-the-spot sample to carry on an investigation in the dust catching ability of typical economic tree in Tianjin, and with the tree which common using in afforestation for a contrast. Investigate the basic characteristic of each plant, and make it to become the assistant data. Through the experiment, we gained the unit of a plant leaf area dust catching quantity, unit leaf heavy dust catching quantity and the single plant dust catching quantity. The conclusion is as follows: The dust catching ability different of the plant is because of the difference of the biology characteristic of tree and natural environment of the tree growth. The city afforestation should choose the stronger tree of the dust catching ability. The dust catching ability of economic tree is less than the tree of common using in afforestation, the single plant leaf area are between 4.84m2 and 992.85 m2, the unit of a plant leaf area of economic tree are between 0.8 mg/cm2 and 1.3 mg/cm2, the single plant dust catching quantity are between 0.055kg and 5.148 kg.The economic tree Having strong dust catching ability, such as persimmon, apricot, walnut and gingko to grow first. In building green landscape, we can select: chinar, paulownia, common papermulberry, persimmon, apricot, walnut, gingko, cherry, fig, forsythia, holly, a species mix. The suggestion is as follows: While choosing the economic tree of dust catching, we should consider the actual circumstance; Synthesize to consider other pollutants to the economic tree influence; Develop strongly the stereoscopic afforestation.

前  言

　　城市化进程的加快加剧了对自然环境的破坏，其改变了自然的空气环境，粉尘、烟雾、有害气体增多，同时，人们不断提高的生活水平对环境质量又提出了更高的要求，城市生态建设日益受到重视。城市绿化改变环境，调节城市小气候，吸收污染气体，吸附尘埃，净化空气等作用日益被认识，且其改善生态环境的功能应放在首位也逐渐成为共识，园林绿地在城市生态系统的平衡调控中起着重要作用[12]。植物滞尘能力作为城市绿化树种选择的一个重要指标开始得以应用。

　　经济林木除了具有经济产出的功能之外，与自然界其他植物一样，同样有吸收二氧化碳、放出氧气的光合作用，有吸收环境中的有毒有害物质，有防风固沙、减少噪音等生态功能[1]。在城市绿化中运用经济林木，将其产生的经济效益再次投入到城市绿化中去，从而可走出一条经济效益与生态效益相结合的可持续发展的城市绿化道路。

　　本次研究采用实地调研为主，查阅资料为辅的方法的，对经济林木的滞尘能力进行研究，并与现有的有关经济林木的其他抗污染能力的研究结果以及非经济林木滞尘能力的研究结果进行科学比较。结合天津实际情况和城市绿化中所要注意的问题，综合考虑各方因素，给出一套能发挥经济林木滞尘能力天津市绿化方案。