scholarly journals Concentrations and Emissions of Ammonia from Different Laying Hen Production Systems of Conventional Cage, Aviary and Natural Mating Colony Cage in North China Plain

2020 ◽  
Vol 10 (19) ◽  
pp. 6820
Author(s):  
Yu Liu ◽  
Guoqiang Zhang ◽  
Li Rong ◽  
Zongyang Li ◽  
Shaojie Wang ◽  
...  
Keyword(s):  
Environmental Factors ◽  
North China Plain ◽  
North China ◽  
Production Systems ◽  
Positive Impact ◽  
Ventilation Rate ◽  
Laying Hen ◽  
Natural Mating ◽  
The Impact ◽  
Indoor And Outdoor

Ammonia (NH3) concentrations in summer were continuously monitored from three typical laying hen houses of CC (conventional cage), AV (aviary), and NM (natural mating colony cage) with manure belt systems in North China Plain to quantify their emission levels, to characterize the diurnal variations, and to investigate the impact of environmental factors. Diurnal profiles were acquired by hourly measurements, and the effect of environmental factors on NH3 emissions was presented by correlation analysis. The results showed that house-level NH3 emissions in summer were the highest in the NM at 27.16 ± 13.12 mg/h·hen, followed by the AV at 4.08 ± 3.23 mg/h·hen and the CC at 3.43 ± 1.46 mg/h·hen within a complete manure removal cycle, which were significantly affected by manure accumulation inside the houses. After manure removal, NH3 concentrations were reduced by 64.29%, 28.57%, and 35.71% in CC, AV, and NM, and consequently their emissions were lowered by 67.12%, 71.36%, and 55.69%, respectively. It was suggested that the manure should not be stored on the belt for more than 4 days in NM. A positive impact of indoor and outdoor temperature and ventilation rate on NH3 emissions from AV and NM were found, while indoor and outdoor relative humidity had a negative effect. However, the above five factors did not significantly affect the emissions from CC.

scholarly journals Size-resolved characterization of organic aerosol in the North China Plain: new insights from high resolution spectral analysis

2021 ◽  
Author(s):  
Weiqi Xu ◽  
Chun Chen ◽  
Yanmei Qiu ◽  
Conghui Xie ◽  
Yunle Chen ◽  
...  
Keyword(s):  
Radiative Forcing ◽  
North China Plain ◽  
North China ◽  
Fine Particles ◽  
Large Fraction ◽  
Organic Aerosol ◽  
Size Distributions ◽  
The North ◽  
The Impact

Organic aerosol (OA), a large fraction of fine particles, has a large impact on climate radiative forcing and human health, and the impact depends strongly on size distributions. Here we...

scholarly journals Impact of crop field burning and mountains on heavy haze in the North China Plain: A case study

2016 ◽  
Author(s):  
X. Long ◽  
X. X. Tie ◽  
J. J. Cao ◽  
R. J. Huang ◽  
T. Feng ◽  
...  
Keyword(s):  
Air Pollution ◽  
North China Plain ◽  
North China ◽  
Wind Condition ◽  
Beijing City ◽  
The North ◽  
The North China Plain ◽  
Crop Field ◽  
The Impact ◽  
Field Burning

Abstract. Crop field burning (CFB) has important effects on air pollution in China, but it is seldom quantified and reported in a regional scale, which is of great importance for the control strategies of CFB in China, especially in the North China Plain (NCP). With the provincial statistical data and open crop fires captured by satellite (MODIS), we extracted a detailed emission inventory of CFB during a heavy haze event from 6th to 12th October 2014. A regional dynamical and chemical model (WRF-Chem) was applied to investigate the impact of CFB on air pollution in NCP. The model simulations were compared with the in situ measurements of PM2.5 (particular matter with radius less than 2.5 μm) concentrations. The model evaluation shows that the correlation coefficients (R) between measured and calculated values exceeds 0.80 and absolute normalized mean bias (NMB) is no more than 14 %. In addition, the simulated meteorological parameters such as winds and planetary boundary layer height (PBLH) are also in good agreement with observations. The model was intensive used to study (1) the impacts of CFB and (2) the effect of mountains on regional air quality. The results show that the CFB occurred in southern NCP (SNCP) had significant effect on PM2.5 concentrations locally, causing a maximum of 35 % PM2.5 increase in SNCP. Because of south wind condition, the CFB pollution plume is subjective a long transport to northern NCP (NNCP-with several mega cities, including Beijing of the capital city in China), where there are no significant CFB occurrences, causing a maximum of 32 % PM2.5 increase in NNCP. As a result, the heavy haze in Beijing is enhanced by the CFB occurred in SNCP. Further more, there are two major mountains located in the western and northern NCP. Under the south wind condition, these mountains play important roles in enhancing the PM2.5 pollution in NNCP through the blocking and guiding effects. This study suggests that the PM2.5 emissions in SNCP region should be significantly limited in order to reduce the occurrences of heavy haze events in NNCP region, including the Beijing City.

scholarly journals Traditional Pollarding Practices for Dimorphic Ash Tree (Fraxinus dimorpha) Support Soil Fertility in the Moroccan High Atlas

Land ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 334
Author(s):  
Abdessamad Fakhech ◽  
Didier Genin ◽  
Mohamed Ait-El-Mokhtar ◽  
El Mustapha Outamamat ◽  
Soufiane M’Sou ◽  
...  
Keyword(s):  
Service Management ◽  
Production Systems ◽  
Positive Impact ◽  
Soil Types ◽  
Spore Density ◽  
High Atlas ◽  
Management Schemes ◽  
The Impact ◽  
Bare Soils ◽  
Kjeldahl Nitrogen

Shaping and pollarding of dimorphic ash tree (Fraxinus dimorpha) are two traditional practices used by the local inhabitants in agropastoral parklands of the Moroccan High Atlas to secure their production systems and increase tree production and strength. This study focused on assessing the impact of these practices on soil quality. Abiotic parameters and mycorrhizal attributes of the samples of four soil types related to different ash tree morphotypes were assessed and compared. Rhizospheric soils (Rs) of three F. dimorpha morphotypes were sampled: trees regularly pollarded and shaped for stem anastomosis (An), regularly pollarded multistemmed trees (Na), and multistemmed trees belonging to a public forest under national forestry service management and sporadically illegally pollarded (Fo). The fourth soil was a non-Rs found in bare soils, which represented the control (Nr). Results showed a sizable difference between An soil properties and the other soil types ones, with significantly higher phosphorus (×6), nitrogen (×5), and carbon (×2) levels and higher mycorrhizal (×6) status than Nr soil, and showed 37% more mycorrhization intensity than Fo. Na showed intermediary levels between An and Fo. Fo had ×2 P, ×3 Total Kjeldahl Nitrogen (TKN), 58% more Total Organic Carbon (TOC) content, and twice the spore density compared with Nr. It is concluded that shaping and pollarding have a positive impact on the soil characteristics of the studied species and could make a useful contribution to sound agroforest management schemes.

Aerosol chemical compositions in the North China Plain and the impact on the visibility in Beijing and Tianjin

2018 ◽  
Vol 201 ◽  
pp. 235-246 ◽  
Author(s):  
Jianan Zou ◽  
Zirui Liu ◽  
Bo Hu ◽  
Xiaojuan Huang ◽  
Tianxue Wen ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
Chemical Compositions ◽  
The North ◽  
The North China Plain ◽  
The Impact

An investigation of government employees’ support for public-private partnerships

2017 ◽  
Vol 30 (5) ◽  
pp. 467-486 ◽  
Author(s):  
Razilya Shakirova
Keyword(s):  
Environmental Factors ◽  
Positive Impact ◽  
Organizational Factors ◽  
Ordinary Least Squares ◽  
Public Private Partnerships ◽  
Least Squares Regression ◽  
Government Employees ◽  
Content Type ◽  
The Usa ◽  
The Impact

Purpose The purpose of this paper is to investigate the factors that may influence support of public-private partnerships (PPPs) by government employees potentially involved in designing and implementing cross-sectoral collaborations. Design/methodology/approach Based on an original survey of government employees in the USA, this study explores the impact of individual, organizational and environmental factors on their support for PPPs by employing ordinary least squares regression. Findings Among the individual factors, involvement in PPPs and concerns for efficiency have been identified as factors having positive impact on government employees’ support for PPPs. Male government employees seem to be less supportive of PPPs than female government employees. Environmental factors such as public opinion and appointed agency heads positively influence government employees’ views of PPPs. No evidence for the significant impact of organizational factors on government employee perceptions of PPPs was found. Research limitations/implications Factors influencing government employees’ attitudes may also have an effect on employees’ behaviors when involved in PPPs. Further studies may clarify how attitudes are translated into behaviors and how they influence the performance of PPPs. Investigations into government employees’ views of PPPs before and after their actual involvement in partnerships may allow for identifying changes in employees’ support for PPPs and their possible causes. Originality/value This study investigates the impacts of individual, organizational and environmental factors on government employees’ support for partnerships with the private sector that remain under-researched in the literature.

Impact of the methods of groundwater access on irrigation and crop yield in the North China Plain

2016 ◽  
Vol 8 (4) ◽  
pp. 613-633 ◽  
Author(s):  
Lijuan Zhang ◽  
Jinxia Wang ◽  
Guangsheng Zhang ◽  
Qiuqiong Huang
Keyword(s):  
Crop Yield ◽  
North China Plain ◽  
North China ◽  
Climate Factors ◽  
Groundwater Use ◽  
Content Type ◽  
The North ◽  
The North China Plain ◽  
Groundwater Markets ◽  
The Impact

Purpose The purpose of this paper is: to track the methods by which farmers access groundwater for irrigation in the North China Plain (NCP); to explore whether climate factors influence farmers’ decisions on the methods of groundwater access for irrigation; and to examine whether the amount of groundwater use for irrigation and crop yield systematically differ across groups of farmers using various methods of groundwater access, and how climate factors affect them. Design/methodology/approach Descriptive statistical analysis and econometric models are used on household survey data collected over several years and county-level climate data. Findings Over the past few decades, a significant share of farmers have switched the methods of groundwater access from collective tubewells to own tubewells or groundwater markets. Farmers who bought water from groundwater markets applied less water to wheat plots than those who had their own tubewells. However, wheat yield was not negatively affected. Both average climate conditions and long-term variations were found to be related to farmers’ choice of methods of groundwater access for irrigation. More frequent droughts and increasingly volatile temperatures both increased the likelihood of farmers gaining groundwater irrigation from markets. Originality/value The analysis results suggest farmers are using groundwater markets to help them adapt to climate change. Applying empirical analysis to identify the impact of the methods by which farmers access groundwater for irrigation on the amount of groundwater use and crop yield will help policy makers design reasonable adaptation policies for the NCP.

scholarly journals Influence of aerosol copper on HO<sub>2</sub> uptake: A novel parameterized equation

2020 ◽  
Author(s):  
Huan Song ◽  
Xiaorui Chen ◽  
Keding Lu ◽  
Qi Zou ◽  
Zhaofeng Tan ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
Liquid Water Content ◽  
Atmospheric Effects ◽  
Peroxy Radicals ◽  
Model Optimization ◽  
Lab Experiments ◽  
New Equation ◽  
Phase Chemistry ◽  
The Impact

Abstract. The heterogeneous uptake of hydroxyl peroxy radicals (HO2) on aerosol has been proposed to be a significant sink of HOx, thus could influence the atmospheric oxidation capacity. Accurate calculation of the uptake coefficient γHO2 is the key to quantifying its atmospheric effects. Laboratory studies show that γHO2 varies by orders of magnitude due to change in aerosol properties, especially those of aerosol soluble copper (Cu) and aerosol liquid water content (ALWC). In this study, we develop a state-of-the-art model to simulate both gas and aerosol phase chemistry. A novel parameterized equation of HO2 considering change in RH and aerosol Cu is developed based on model optimization toward all available lab experiments. 1 / γ = 1 / α + (3 × v) / (4 × 106 × Rd Hcorr RT × (5.87 + 3.2 × ln(ALWC / [PM] + 0.067)) × [PM]−0.2 × [Cu2+]0.65) According to the new equation, highly variable HO2 uptake coefficients (median value ∼0.1) were diagnosed for North China Plain and the impact of HO2 uptake on the ROx budget is assessed.

scholarly journals Study on the Change Characteristics of and Population Exposure to Heatwave Events on the North China Plain

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Long-Fei Zhan ◽  
Yanjun Wang ◽  
Hemin Sun ◽  
Jianqing Zhai ◽  
Mingjin Zhan
Keyword(s):  
North China Plain ◽  
North China ◽  
Climatic Factors ◽  
Demographic Data ◽  
Population Exposure ◽  
Central Position ◽  
Daily Maximum ◽  
The North ◽  
The North China Plain ◽  
The Impact

In accordance with the China Meteorological Administration definition, this study considered a weather process with a maximum surface temperature of ≥35°C for more than three consecutive days as a heatwave event. Based on a dataset of daily maximum temperatures from meteorological stations on the North China Plain, including ordinary and national basic/reference surface stations, the intensity-area-duration method was used to analyze the spatiotemporal distribution characteristics of heatwave events on the North China Plain (1961–2017). Moreover, based on demographic data from the Statistical Yearbook and Greenhouse Gas Initiative (GGI) Population Scenario Database of the Austrian Institute for International Applied Systems Analysis (IIASA), population exposure to heatwave events was also studied. The results showed that the frequency, intensity, and area of impact of heatwave events on the North China Plain initially decreased (becoming weaker and less extensive) and then increased (becoming stronger and more extensive). Similarly, the trend of population exposure to heatwave events initially decreased and then increased, and the central position of exposure initially moved southward and then returned northward. Population exposure in the eastern Taihang Mountains was found significantly higher than in the western Taihang Mountains. In relation to the change of population exposure to heatwave events on the North China Plain, the influence of climatic factors was found dominant with an absolute contribution rate of >75%. Except for 2011–2017, increase in population also increased the exposure to heatwaves, particularly in the first half of the study period. Interaction between climatic and population factors generally had less impact on population exposure than either climatic factors or population factors alone. This study demonstrated a method for assessing the impact of heatwave events on population exposure, which could form a scientific basis for the development of government policy regarding adaption to climate change.

scholarly journals Observation of atmospheric peroxides during Wangdu Campaign 2014 at a rural site in the North China Plain

2016 ◽  
Vol 16 (17) ◽  
pp. 10985-11000 ◽  
Author(s):  
Yin Wang ◽  
Zhongming Chen ◽  
Qinqin Wu ◽  
Hao Liang ◽  
Liubin Huang ◽  
...  
Keyword(s):  
Biomass Burning ◽  
North China Plain ◽  
North China ◽  
Chemical Mechanism ◽  
Rural Site ◽  
Direct Production ◽  
The North ◽  
The North China Plain ◽  
The Impact ◽  
Haze Days

Abstract. Measurements of atmospheric peroxides were made during Wangdu Campaign 2014 at Wangdu, a rural site in the North China Plain (NCP) in summer 2014. The predominant peroxides were detected to be hydrogen peroxide (H2O2), methyl hydroperoxide (MHP) and peroxyacetic acid (PAA). The observed H2O2 reached up to 11.3 ppbv, which was the highest value compared with previous observations in China at summer time. A box model simulation based on the Master Chemical Mechanism and constrained by the simultaneous observations of physical parameters and chemical species was performed to explore the chemical budget of atmospheric peroxides. Photochemical oxidation of alkenes was found to be the major secondary formation pathway of atmospheric peroxides, while contributions from alkanes and aromatics were of minor importance. The comparison of modeled and measured peroxide concentrations revealed an underestimation during biomass burning events and an overestimation on haze days, which were ascribed to the direct production of peroxides from biomass burning and the heterogeneous uptake of peroxides by aerosols, respectively. The strengths of the primary emissions from biomass burning were on the same order of the known secondary production rates of atmospheric peroxides during the biomass burning events. The heterogeneous process on aerosol particles was suggested to be the predominant sink for atmospheric peroxides. The atmospheric lifetime of peroxides on haze days in summer in the NCP was about 2–3 h, which is in good agreement with the laboratory studies. Further comprehensive investigations are necessary to better understand the impact of biomass burning and heterogeneous uptake on the concentration of peroxides in the atmosphere.

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