Guiyang City Research Articles

Song, Y., Geng, K., Zhang, B., Hyde, K.D., Zhao, W.-S., Wei, J.-G., Kang, J.-C. & Wang, Y. (2013) Two new species of Pestalotiopsis from Southern China. Phytotaxa 126 (1), 22–30.<br />

The authors of paper “Two new species of Pestalotiopsis from Southern China” regret that the affiliation of Bin Zhang is incorrect. His affiliation is “Plant Protection and Quarantine Station, Guiyang City, 550081, People’s Republic of China”, thus the superscript of his name should be changed from “1” to “3”.

The Level of Zn in Guiyang Street Dust and its Different Particle Size Fraction Contributions

By collecting dust samples from seven different functional areas of Guiyang city, we studied the distribution pattern of the level of Zn in dusts with particle size fractions. The result showed the geometric means of Zn concentration in dusts of Guiyang was 435mg/kg. The Zn in most functional areas was primarily associated with middle particles, while the Zn in industrial area and garbage stations were primarily associated with fine particles.

Current status and future trends of SO2 and NOx pollution during the 12th FYP period in Guiyang city of China

In order to investigate the future trends of SO2 and NOx pollution in Guiyang city of China, the MM5/CALMET/CALPUFF modeling system is applied to assess the effects of air pollution improvement that would result from reduction targets for SO2 and NOx emissions during the 12th Five-Year Plan (2011–2015). Three scenarios are established for the objective year 2015 based on the reference emissions in base year 2010. Scenario analysis and modeling results show that emissions are projected to increase by 26.5% for SO2 and 138.0% for NOx in 2015 Business-As-Usual (BAU) relative to base year 2010, respectively, which will lead to a substantial worsening tendency of SO2 and NOx pollution. In comparison, both the 2015 Policy Reduction (PR) and 2015 Intensive Policy Reduction (IPR) scenarios would contribute to improve the urban air quality. Under 2015 PR scenario, the maximum annual average concentration of SO2 and NOx will reduce by 54.9% and 31.7%, respectively, relative to the year 2010, with only 2.1% of all individual gridded receptors exceed the national air quality standard limits; while the maximum annual average concentrations of SO2 and NOx can reduce further under 2015 IPR scenario and comply well with standards limits. In view of the technical feasibility and cost-effectiveness, the emission reduction targets set in the 2015 PR scenario are regarded as more reasonable in order to further improve the air quality in Guiyang during the 12th FYP period and a series of comprehensive countermeasures should be effectively implemented.

Working Conditions and Job Satisfaction of China's New Generation of Migrant Workers: Evidence from an Inland City

China is experiencing notable changes in rural-urban migration. Young, more educated migrants with different attitudes towards living and working form an increasing share of the migrant labour force. At the same time, the destinations of migrants are changing as a result of government policies and the global financial crisis. More migrants than before find jobs in medium and small size cities, often located in western and central China. Understanding the characteristics and attitudes of the changing migrant labour force is becoming a major challenge in sustainably managing migration flows and urbanization. Little hard evidence is available on the working conditions and job attitudes of migrant workers, particularly for inland China. The purpose of this paper is to provide insights into the characteristics, working conditions and job attitudes of the new generation of migrants, defined as those born in the 1980s and 1990s, as compared to the traditional generation in a typical medium-size city in western China. Data collected through a household survey conducted among 1,048 migrants in Guiyang City, capital of Guizhou Province, are used for this purpose. We find significant differences in occupational characteristics and working conditions between the two generations. Contrary to popular beliefs, we find that the level of job satisfaction is higher among the new generation of migrants. Using an ordered logit model to examine factors contributing to job satisfaction, we find that age and gender do not have a significant impact for young migrants, while working conditions play a major role. Among these, it is not so much the income level that matters for young migrants, but other working conditions. Using a Blinder-Oaxaca decomposition, we derive that it is mainly the difference in working conditions and other endowments that explains the higher job satisfaction of young migrants, not the differences between generations in the valuations of these endowments.

The impact of sulfate reduction on the distribution of methylmercury in reservoirs in the city of Guiyang

In this paper, the relationship between sulfate reduction potential and mercury methylation potential was studied in the Aha, Baihua and Hongfeng reservoirs from Guiyang City. The methylmercury (MeHg) concentrations of lake water in the Aha Reservoir were greatly elevated as compared to those of the Hongfeng and Baihua reservoirs, which was correlated with its distinctly high SRB abundance, SO42−, and S2− concentrations. Among the three reservoirs, however, the highest MeHg was observed in in the top several centimenters of pore water profile in the Hongfeng Reservoir where the lowest S2− in pore water occurred. The distributions of MeHg in lake water and pore water showed the highest methylation potential occurred at water-sediment surface for the Aha Reservoir and the in the top several centimenters of sediments for the Hongfeng Reservoir. It is guessed that the highest mercury methylation only occurs at the sites with certain sulfide concentrations.

Vitamin D status and its effect on bone mineral density of the middle and old aged women in the urban area of Guiyang

Objective To evaluate vitamin D status of the middle and old aged women in the urban area of Guiyang,and to explore the impact of vitamin D status on the bone mineral density.Methods A total of 511 healthy women,aged 40 to 79 years old,living in one of the urban communities in Guiyang,were selected by means of stratified cluster sampling.The levels of serum 25-hydroxyvitamin D [25 (OH) D] and intact parathyroid hormone (iPTH) were detected by radioimmunoassay.In addition,the bone mineral density (BMD) of hip,lumbar vertebrae 1-4 (L1-4),and neck of left femur were detected by Dual energy X ray absorptiometry.Results The average serum level of 25(OH)D in all subjects was (21.3 ± 7.9) ng/ml and that of iPFH was (29.3 ± 16.5) pg/ml.Severe deficiency [25 (OH) D＜ 10 ng/ml],deficiency [10 ≤ 25 (OH) D＜20 ng/ml],insufficiency [20 ≤ 25 (OH) D ≤ 30ng/ml],and sufficiency [25 (OH) D＞ 30 ng/ml] of vitamin D were ascertained in 5.3％,42.3％,37.9％,and 14.5％ of the total cases respectively.The morbidity of secondary hyperparathyroidism was 4.7％.The level of 25 (OH) D was positively correlated with the BMD of L1-4 and neck of left femur (both P＜0.01).The level of iPTH was negatively correlated with BMD of neck of left femur and L1-4 (both P＜0.05).Conclusion The majority of middle and old aged women in the urban area of Guiyang city were found to be of vitamin D deficiency and insufficiency.Vitamin D status is positively correlated with BMD at lumbar spine and proximal femur.Serum 25 (OH) level below 20 ng/ml is associated with raised parathyroid hormone,which increases the risk of osteoporosis. Key words: Vitamin D; Parathyroid hormone; Bone health; Middle and old aged women

Natural and anthropogenic lead in soils and vegetables around Guiyang city, southwest China: A Pb isotopic approach

Soils, vegetables and rainwaters from three vegetable production bases in the Guiyang area, southwest China, were analyzed for Pb concentrations and isotope compositions to trace its sources in the vegetables and soils. Lead isotopic compositions were not distinguishable between yellow soils and calcareous soils, but distinguishable among sampling sites. The highest 207Pb/206Pb and 208Pb/206Pb ratios were found for rainwaters (0.8547–0.8593 and 2.098–2.109, respectively), and the lowest for soils (0.7173–0.8246 and 1.766–2.048, respectively). The 207Pb/206Pb and 208Pb/206Pb ratios increased in vegetables in the order of roots<stems<leaves<fruits. Plots of the 207Pb/206Pb ratios versus the 208Pb/206Pb ratios from all samples formed a straight line and supported a binary end-member mixing model for Pb in vegetables. Using deep soils and rainwaters as geogenic and anthropogenic end members in the mixing model, it was estimated that atmospheric Pb contributed 30–77% to total Pb for vegetable roots, 43–71% for stems, 72–85% for leaves, and 90% for capsicum fruits, whereas 10–70% of Pb in all vegetable parts was derived from soils. This research supports that heavy metal contamination in vegetables can result mainly from atmospheric deposition, and Pb isotope technique is useful for tracing the sources of Pb contamination in vegetables.

The application of spatial stratified sampling in remote sensing monitoring of forest cover

In this paper,we selected the forest cover per hectare in Huaxi district,Guiyang city as an example to explore the application of spatial stratified sampling for forest resources.By using the information from SPOT5 image as foundation,a 100 m×100 m sampling frame was constructed,the information extracted from SPOT5 image were used to make priori sampling.The results showed that there is significant spatial autocorrelation of the forest cover per hectare from Moran's I.The result of ordinary Kriging interpolation is used as the auxiliary factor to stratify.Our research initially show that spatial stratified sampling is more efficient compared with classic sampling or spatial random sampling.

Prediction of Blast-Induced Ground Vibration Using Support Vector Machine by Tunnel Excavation

Beijing East Road No.1 tunnel in Guiyang city has the most complexity in arround, so prediction and control the blasting vibration is the most important task. In order to improve the accuracy of the prediction of the blasting vibration to mitigate the possible hazard in tunnel construction, studied on method of predicting peak particle velocity (PPV) using support vector machine (SVM) and established regression prediction model based on SVM. Comparisons between the predicted PPV using the empirical equation regression and SVM was made, find that the SVM gives much better prediction of PPV than does the empirical equation regression.

Combinatorial analysis on spatial information statistics for the karst water environment in Guiyang, China

The karst groundwater system is extremely vulnerable and easily contaminated by human activities. To understand the spatial distribution of contaminants in the groundwater of karst urban areas and contributors to the contamination, this paper employs the spatial information statistics analysis theory and method to analyze the karst groundwater environment in Guiyang City. Based on the karst groundwater quality data detected in 61 detection points of the research area in the last three years, we made Kriging evaluation isoline map with some ions in the karst groundwater, such as SO42−, Fe3+, Mn2+ and F−, analyzed and evaluated the spatial distribution, extension and variation of four types of ions on the basis of this isoline map. The results of the analysis show that the anomaly areas of SO42−, Fe3+, Mn2+, F− and other ions are mainly located in Baba’ao, Mawangmiao and Sanqiao in northwestern Guiyang City as well as in its downtown area by reasons of the original non-point source pollution and the contamination caused by human activities (industrial and domestic pollution).

Removal of Agricultural Non-Point Source Pollutants by Ditch Wetlands of the Maixi River, Guizhou Province, China

A natural ditch wetland grown with nature annual bluegrass (Poa annua L.), alligator weed (Alternanthera philoxeroides (Mart.) Griseb.), common duckweed (Lemna minor L.) and curly pondweed (Potamogeton crispus L.) etc. were selected to study the removal capacity of agricultural non-point source pollutants in the Maixi River in Guiyang City, the capital of Guizhou Province, China. The removal characteristics and seasonal variation of chemical oxygen demand (COD), total phosphorus (TP), ammonia-nitrogen (NH+4-N), and suspended solids (SS) in the ditch water was studied. The results showed that there existed a certain seasonal diversity in the removal characteristics of nitrogen, phosphorus and organic pollutants by the ditch. The removal efficiency of TP, COD and SS demonstrated an increasing tendency with their increasing concentration at the ditch inlet, whereas that of the NH4+-N displayed contrary tendency as the concentration of NH4+-N increased.

Seasonal variations in sulfur isotopic composition of dissolved SO4 2− in the Aha Lake, Guiyang and their implications

The Aha Lake is a seasonal anoxic water system in the southwest of Guiyang City, Guizhou Province, China. Seasonal variations in SO42− concentrations and their isotopic compositions in lake water as well as in the tributaries were investigated in this study. The results showed that sulfate concentrations in river water range from 0.94 to 6.52 mmol/L and their δ34S values range from t14.9‰ and 0.9‰, while lake water has sulfate concentrations ranging from 1.91 to 2.79 mmol/L, and δ34S values from −9.8‰ to −5.9‰. It is suggested that coal mining drainage is the major source of SO42− in the Aha Lake. Rainfall, sewage discharge, sulfide oxidation and gypsum dissolution have made only limited contributions. Different depth-dependent distributions of dissolved SO42− and δ34S were developed for both DB and LJK in summer and winter. Due to water overturn, δ34S values display homogenous vertical distributions in winter and spring. While in summer and autumn, significant positive shifts of δ34S were clearly observed in epilimnion and bottom strata as a result of water stratification. High δ34S values in epilimnion may result from the retention of rainwater during water stratification. Dissimilatory sulfate reduction by bacteria was thought to be responsible for the increase of δ34S value in hypolimnion.

Occurrence of Organochlorine Pesticides and Polychlorinated Biphenyls in Six Fish Species from Baihua Lake, China

Baihua Lake, a man-made reservoir located in a typical plateau karstic area, is one of the five drinking water sources for Guiyang city. In the present research, the organochlorine pesticides and polychlorinated biphenyls in the muscle tissues of six fish species collected from Baihua Lake were estimated by gas chromatography/mass spectrometry (GC/MS) . The total concentration of OCPs ranged from 2.83 to 94.25 ng g-1 (dry weight), and that of PCBs ranged from ND to 4.78 ng g-1. p,p’-DDD, p,p’-DDE, γ-HCH and PCB28 were detected in the majority of the samples. However the biomagnifications of OCPs and PCBs were not significant in the selected fish from the lake.

Ecological Risk Assessment of Heavy Metals in Sediments from Aha Lake, China

In the present work, contamination and potential ecological risk of six heavy metals (Pb, Cd, Hg, As, Cu and Zn) in sediments of Aha Lake, one of the five drinking water sources for Guiyang City, were assessed based on a method which is associated with toxic-response factors of contaminants. For comparison, the two sets of reference data representing the pre-industrial and the local baseline pollution levels were employed. When the pre-industrial levels were taken as references, the accumulating coefficients on average diminished in the order of Zn &gt; As &gt; Hg &gt; Cd &gt; Cu &gt; Pb, and the potential ecological risk descended in the order of Hg &gt; Cd &gt; As &gt; Cu &gt; Zn &gt; Pb. When the local baseline values worked as references, the accumulating coefficients on average diminished in the order of Cd &gt; Zn &gt; Hg &gt; Cu &gt; As &gt; Pb, and the potential ecological risk descended in the order of Cd &gt; Hg &gt; As &gt; Cu &gt; Zn &gt; Pb. It is evident that Cd and Hg are the critical elements in terms of potential ecological hazard in Aha Lake among these six heavy metals.

Speciated atmospheric mercury and its potential source in Guiyang, China

Abstract Speciated atmospheric mercury (Hg) including gaseous elemental mercury (GEM), particulate Hg (PHg), and reactive gaseous Hg (RGM) were continuously measured at an urban site in Guiyang city, southwest China from August to December 2009. The averaged concentrations for GEM, PHg, and RGM were 9.72 ± 10.2 ng m −3 , 368 ± 676 pg m −3 , and 35.7 ± 43.9 pg m −3 , respectively, which were all highly elevated compared to observations at urban sites in Europe and North America. GEM and PHg were characterized by similar monthly and diurnal patterns, with elevated levels in cold months and nighttime, respectively. In contrast, RGM did not exhibit clear monthly and diurnal variations. The variations of GEM, PHg, and RGM indicate the sampling site was significantly impacted by sources in the city municipal area. Sources identification implied that both residential coal burning and large point sources were responsible to the elevated GEM and PHg concentrations; whereas point sources were the major contributors to elevated RGM concentrations. Point sources played a different role in regulating GEM, PHg, and RGM concentrations. Aside from residential emissions, PHg levels was mostly affected by small-scale coal combustion boilers situated to the east of the sampling site, which were scarcely equipped or lacking particulate control devices; whereas point sources situated to the east, southeast, and southwest of the sampling played an important role on the distribution of atmospheric GEM and RGM.

The Planning Research of Street Space for Fringe Residential Areas in Main city of Guiyang - Based on the Concept of "Place Theory"

Several issues of fringe residential area street space in main city of Guiyang raised during the constuction process have come into notice.An obvious one is that the status of fringe residential area street space hasn’t met the residents’life and physical needs, resulting in the loss of vigor and vitality of fringe residential area street space. Therefore, this paper proposes a new planning which bases on the concept of place theory,meeting the diverse needs of residents in daily life,considering the elements of street space for fringe residential area.The elements will be devided into the shapes, psychological needs and cultural connotations.

Conodont Biostratigraphy and Age Determination of the Lower‐Middle Triassic Boundary in South Guizhou Province, China

Abstract:The demarcation of the Lower–Middle Triassic boundary is a disputed problem in global stratigraphic research. Lower–Middle Triassic strata of different types, from platform to basin facies, are well developed in Southwest China. This is favorable for the study of the Olenekian–Anisian boundary and establishing a stratotype for the Qingyan Stage. Based on research at the Ganheqiao section in Wangmo county and the Qingyan section in Guiyang city, Guizhou province, six conodont zones have been recognized, which can be correlated with those in other regions, in ascending order as follows: 1, Neospathodus cristagalli Interval‐Zone; 2, Neospathodus pakistanensis Interval‐Zone; 3, Neospathodus waageni Interval‐Zone; 4, Neospathodus homeri‐N. triangularis Assemblage‐Zone; 5, Chiosella timorensis Interval‐Zone; and 6, Neogongdolella regalis Range‐Zone. An evolutionary series of the Early–Middle Triassic conodont genera Neospathodus‐Chiosella‐Neogongdolella discovered in the Ganheqiao and Qingyan sections has an intermediate type named Neospathodus qingyanensis that appears between Neospathodus homeri and Chiosella timorensis in the upper part of the Neospathodus homeri‐N. triangularis Zone, showing an excellent evolutionary relationship of conodonts near the Lower–Middle Triassic boundary. The Lower–Middle Triassic boundary is located at 1.5 m below the top of the Ziyun Formation, where Chiosella timorensis Zone first appears in the Qingyan section, whereas this boundary is located 0.5 m below the top of the Ziyun Formation, where Chiosella timorensis Zone first appears in the Ganheqiao section. There exists one nearly 6‐m thick vitric tuff bed at the bottom of the Xinyuan Formation in the Ganheqiao section, which is usually regarded as a lithologic symbol of the Lower–Middle Triassic boundary in South China. Based on the analysis of high‐precision and high‐sensitivity Secondary Ion Mass Spectrum data, the zircon age of this tuff has a weighted mean 206Pb/238U age of 239.0 ± 2.9 Ma (2σ), which is a directly measured zircon U‐Pb age of the Lower–Middle Triassic boundary. The Ganheqiao section in Wangmo county can therefore provide an excellent section through the Lower–Middle Triassic because it is continuous, the evolution of the conodonts is distinctive and the regionally stable distributed vitric tuff near the Lower–Middle Triassic boundary can be regarded as a regional key isochronal layer. This section can be regarded not only as a standard section for the establishment of the Qingyan Stage in China, but also as a reference section for the GSSP of the Lower–Middle Triassic boundary.

The geochemical characteristics of aqueous rare-earth elements in shallow karst groundwater in Guiyang City, China

Fifty-seven shallow groundwater samples were collected from Guiyang karst basin, China, to analyze the aqueous rare-earth elements in low-water seasons and it is shown that the total amount of rare-earth elements (ΣREE) in karst groundwater is exceedingly low compared with that in carbonate rocks or weathering crusts of carbonate rocks, and ranges from 0.01 to 0.43, from 0.03 to 0.27, from 0.03 to 0.19 and from 0.05 to 1.38 μg·L−1 for dolomite, dolomitic & limestone, limestone and clastic rock aquifer, respectively. Both distributions and contents of rare-earth elements (REE) in karst groundwater reflect the lithology of host rocks or weathering crusts of carbonate rocks through which groundwater flows. The chondrite-normalized patterns show a non-flat profile with higher enrichment of slightly light rare-earth elements (LREE) than heavy rare-earth elements (HREE), prominent fractionation between LREE and HREE, negative Ce anomalies and negative or positive Eu anomalies. There is more obvious fractionation between LREE and HREE in groundwater than that in carbonate rocks and their weathering crusts due to high contents of HCO3− and PH in groundwater. In shallow karst groundwater, REE(CO3)n2n−3 (n=1 and 2) is the main inorganic species of REE. But for a clastic rock aquifer, both REESO4+ and REECO3+ are the main inorganic species of REE. Species of REE in groundwater is closely associated with the hydrochemical type of groundwater which is predominated by the lithology of host rocks, groundwater-rock interaction and weathering-pedogenesis of carbonate rocks.

Atmospheric mercury species measured in Guiyang, Guizhou province, southwest China

Atmospheric mercury (Hg) species were measured in Guiyang City, the capital of Guizhou province, southwestern China at the Guiyang Monitoring Station Agency (GMSA) from September to November 2008 and at the Institute of Geochemistry, Chinese Academy of Sciences (IGCAS) during February, May, and July, 2009. Monitoring results found elevated concentrations of all three Hg species in ambient air in Guiyang. Large temporal and spatial variation patterns in the resulting data were also obtained. The overall average TGM concentrations at the GMSA and IGCAS sampling sites were 7.4±4.8ngm−3 and 6.2±5.1ngm−3, respectively. The average Hg(p) and RGM concentrations at GMSA were 1330pgm−3 and 24pgm−3, and at IGCAS were 250pgm−3 and 19pgm−3, respectively. It is hypothesized that local anthropogenic sources and the seasonal variability result in the high degree of spatial and temporal variability.

Occurrence and behaviour of nonylphenol and octylphenol in Nanming River, Guiyang City, China

Occurrence, variation and behaviour of nonylphenol (NP) and octylphenol (OP) were studied in surface water and groundwater in Guiyang, Guizhou Province, southwestern China. Discharge of wastewater from Guiyang City was the main source of alkylphenols (APs) entering the aquatic environment. The concentrations of NP and OP in river water ranged from 40 to 1582 ng L(-1) and from below the lowest limit of detection (LOD) to 67 ng L(-1), respectively. NP and OP were also detected in groundwater. Both NP and OP exhibited spatial and temporal variations in river water and groundwater. It was found that concentrations of NP and OP in river water was low upstream and dramatically increased downstream, and higher concentration of NP was found in winter compared to that in summer. Proportions of NP and OP were trapped by suspended particulate matter (SPM), which accounted for 7.6-50.0% and 3.4-25.6% of their total concentration in the river water system, respectively. Seasonal changes in water flow were responsible for the temporal variations of APs. To determine the behaviour of APs along the river, a mass balance equation based on chloride was used. The results showed that a mixing process was the predominant factor to determine upstream APs concentrations; while the discharge of wastewater controlled the concentrations of APs downstream. Considering the adverse effect of APs on organisms, combined effect modeling was used to assess the toxicity to fish. It was found that the predicted mixture effect for APs in river water on fish vitellogenin induction was low upstream and medium downstream, respectively.