Department of Horticulture, National Chung Hsing University, 250, Kuo Kuang Road, Taichung City 402, Taiwan.
Int J Environ Res Public Health. 2011 Jun;8(6):2304-19. doi: 10.3390/ijerph8062304. Epub 2011 Jun 20.
Negative air ions (NAI) produce biochemical reactions that increase the levels of the mood chemical serotonin in the environment. Moreover, they benefit both the psychological well being and the human body's physiological condition. The aim of this research was to estimate and measure the spatial distributions of negative and positive air ions in a residential garden in central Taiwan. Negative and positive air ions were measured at thirty monitoring locations in the study garden from July 2009 to June 2010. Moreover, Kriging was applied to estimate the spatial distribution of negative and positive air ions, as well as the air ion index in the study area. The measurement results showed that the numbers of NAI and PAI differed greatly during the four seasons, the highest and the lowest negative and positive air ion concentrations were found in the summer and winter, respectively. Moreover, temperature was positively affected negative air ions concentration. No matter what temperature is, the ranges of variogram in NAI/PAI were similar during four seasons. It indicated that spatial patterns of NAI/PAI were independent of the seasons and depended on garden elements and configuration, thus the NAP/PAI was a good estimate of the air quality regarding air ions. Kriging maps depicted that the highest negative and positive air ion concentration was next to the waterfall, whereas the lowest air ions areas were next to the exits of the garden. The results reveal that waterscapes are a source of negative and positive air ions, and that plants and green space are a minor source of negative air ions in the study garden. Moreover, temperature and humidity are positively and negatively affected negative air ions concentration, respectively. The proposed monitoring and mapping approach provides a way to effectively assess the patterns of negative and positive air ions in future landscape design projects.
空气负离子（NAI）产生生化反应，增加环境中情绪化学物质 5-羟色胺的水平。此外，它们有益于心理健康和人体的生理状况。本研究的目的是估计和测量台湾中部一个住宅花园中负氧离子和正氧离子的空间分布。2009 年 7 月至 2010 年 6 月，在研究花园的 30 个监测点测量负氧离子和正氧离子。此外，应用克里金法估计研究区域的负氧离子和正氧离子的空间分布以及空气离子指数。测量结果表明，四个季节的 NAI 和 PAI 数量差异很大，夏季和冬季分别发现最高和最低的负氧离子和正氧离子浓度。此外，温度对负氧离子浓度有正影响。无论温度如何，四个季节中 NAI/PAI 的变异函数范围相似。这表明 NAI/PAI 的空间模式与季节无关，而是取决于花园元素和配置，因此 NAP/PAI 是衡量空气离子空气质量的良好指标。克里金图表明，最高的负氧离子和正氧离子浓度靠近瀑布，而空气离子最低的区域靠近花园出口。结果表明，水景观是负氧离子和正氧离子的来源，而植物和绿色空间是研究花园中负氧离子的次要来源。此外，温度和湿度分别对负氧离子浓度有正和负的影响。提出的监测和绘图方法为未来景观设计项目中有效评估负氧离子和正氧离子的模式提供了一种方法。
