scholarly journals Effects of Different Site Conditions on the Concentration of Negative Air Ions in Mountain Forest Based on an Orthogonal Experimental Study

2021 ◽  
Vol 13 (21) ◽  
pp. 12012
Author(s):  
Qi Chen ◽  
Rui Wang ◽  
Xinping Zhang ◽  
Jianjun Liu ◽  
Dexiang Wang
Keyword(s):  
Health Promotion ◽  
Forest Canopy ◽  
Shaanxi Province ◽  
Orthogonal Experimental Design ◽  
Mountain Forest ◽  
Site Conditions ◽  
Mountain Forests ◽  
Air Ions ◽  
Canopy Density ◽  
Negative Air Ions

The negative air ions (NAI) in a forest play an important and positive role in promoting the health of people using the forest for recreation. The purpose of this study was to explore the environmental characteristics that can effectively represent high concentrations of NAI in mountain forests to help the recreational users to seek out sites with high NAI concentrations for personal health reasons. In order to achieve this goal, we selected the mountain forest of Taibai Mountain National Forest Park, Shaanxi Province, China, as the research object and adopted an orthogonal experimental design with three factors and three levels to study the effects of terrain, altitude, and forest canopy density on the forest NAI concentrations. The results show that obvious peak–valley fluctuation occurs during 6:31 a.m. to 18:30 p.m., with the highest concentration of NAI at 8:00 a.m. (Average: 163 ions/cm3) and the lowest at 16:00 p.m. (Average: 626 ions/cm3). The altitude (p < 0.01) and canopy density (p < 0.05) were found to significantly affect NAI concentrations. The combination of site conditions in the mountain forest observed to have the highest NAI concentrations was valley topography, low altitude, and high canopy density. In addition, the highest NAI concentration was between 14:00 p.m. and 16:00 p.m., under this combination, which was thus identified as the most suitable time for health-promotion activities in mountain forests. The results provide insights into the NAI concentration characteristics and variations, along with identifying important environmental factors for the selection of health-promotion activities in mountain forests.

Progress of negative air ions in health tourism environments applications

2018 ◽  
Vol 33 (1) ◽  
pp. 27-46 ◽  
Author(s):  
FT Lazzerini ◽  
MT Orlando ◽  
W De Pra
Keyword(s):  
Air Ions ◽  
Health Tourism ◽  
Negative Air Ions

Observing Negative Air Ions Concentration in Beidaihe and Negative Air Ions’ Evaluation Standard

2012 ◽  
Vol 178-181 ◽  
pp. 747-750
Author(s):  
Yu Guo Zhuo ◽  
Jun Liu
Keyword(s):  
Health Care ◽  
Human Health ◽  
Air Ions ◽  
Evaluation Standard ◽  
Negative Air Ions ◽  
Occurrence Mechanism ◽  
The Relationship

The concept and occurrence mechanism of negative air ions (NAI) was introduced and its health care function was described. Through observing NAI concentration of six spots in Beidaihe in China, NAI evaluation standard which has seven grades is put up and the relationship between negative air ion quantity and human health is clarified clearly.

Effects of negative air ions treatment on the quality of fresh shiitake mushroom (Lentinus edodes) during storage

2021 ◽  
pp. 131200
Author(s):  
Saili Zhang ◽  
Xiangjun Fang ◽  
Weijie Wu ◽  
Chuan Tong ◽  
Hangjun Chen ◽  
...  
Keyword(s):  
Lentinus Edodes ◽  
Shiitake Mushroom ◽  
Air Ions ◽  
Negative Air Ions

scholarly journals Huftiere und Verjüngung im Gebirgswald: eine Geschichte mit vielen Variablen und noch mehr Interaktionen | Ungulates and Tree Regeneration in Mountain Forests: an Issue with many Variables and even more Interactions

2000 ◽  
Vol 151 (4) ◽  
pp. 99-106 ◽  
Author(s):  
Josef Senn
Keyword(s):  
Tree Regeneration ◽  
Small Scale ◽  
Mountain Forest ◽  
Forest Trees ◽  
Mountain Forests ◽  
Wild Ungulates ◽  
Site Factors ◽  
The Past

After excessive cutting in Swiss mountain forests and extirpation of most of the wildlife during the past centuries, efficient forestry and hunting laws allowed a wide regeneration of the forests and a rapid increase of ungulate populations in the present century. As a consequence, the impacts of ungulates on the vegetation became obvious. Regeneration of forest trees, however, is influenced not only by ungulates, but by a number of physical site factors and biotic impacts. As these impacts and their interactions vary extensively, regeneration is neither spatially nor temporally constant. Most of the presently used tree-regeneration methods, however, assume constant conditions, which renders a proper evaluation of tree regeneration in mountain forests and the role of ungulates impossible. Furthermore, the effect of this variation on forest development and forest functions is unknown with regard to the long term. While society requires a multipurpose mountain forest, structured at a small scale, wild ungulates use their habitat at a larger scale. This often leads to conflicts. Consequently,solutions including different scales are necessary. A lack of knowledge will, therefore, have to be met by research making data available to the practice as well as through coordinated investigations and experiments.

scholarly journals INVESTIGATION OF FOREST CANOPY DENSITY CHANGES IN HYRCANIAN FOREST RESOURCES DURING 1987 TO 2002 USING REMOTE SENSING TECHNOLOGY

2019 ◽  
Vol XLII-4/W18 ◽  
pp. 1031-1034
Author(s):  
M. Taefi Feijani ◽  
S. Azadnejad ◽  
S. Homayouni ◽  
M. Moradi
Keyword(s):  
Time Series ◽  
Forest Canopy ◽  
Spectral Band ◽  
Mixed Forest ◽  
Canopy Density ◽  
Rate Of Growth ◽  
Sensing Technology ◽  
Forest Canopy Density ◽  
Annual Time Series ◽  
Forest Lands

Abstract. Forest canopy density (FCD) of seventeen protected areas of the Caspian Hyrcanian mixed forest are studied here. A modified version of FCD mapper based on spectral band fusion and customized threshold calibration that is optimized for Hyrcanian forests is used for this purpose. In this project, the results of applying the FCD model on three time series of satellite images have been analysed. This classification is based on the FAO standard and consist of four categories such as no-forest, thin, semi-dense and dense. These images, taken with TM and ETM sensors, belong to three-time series between 1987 and 2002. The results of this study indicate that the rate of growth or destruction of forests has been investigated in the regions. Then, using tables and diagrams of variations, the rate of growth or destruction of forest lands in the corresponding period in each class is determined. The FCD model has the ability to study the canopy loading classes in the annual time series.

Damage effects induced by electrically generated negative air ions in Caenorhabditis elegans

2008 ◽  
Vol 401 (1-3) ◽  
pp. 176-183 ◽  
Author(s):  
Kezhou Cai ◽  
Xuelan Liu ◽  
Yongjian Xu ◽  
Chong Ren ◽  
Hua Chen ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Air Ions ◽  
Negative Air Ions
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