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Wang P.,University of Science and Technology of China | Wang J.,University of Science and Technology of China | Wang J.,Key Laboratory of Land Consolidation and Rehabilitation | Qin Q.,University of Science and Technology of China | Wang H.,University of Science and Technology of China
Renewable and Sustainable Energy Reviews | Year: 2017

Considering that most previous studies on environmental impacts of magnetized fly-ash compound fertilizer (MFCF) were based on one single stage of field application, this study attempted to assess the environmental impact of MFCF production using life cycle assessment to provide some new information about environmental impacts of MFCF and develop some measures of reducing environmental pollution resulted from the compound fertilizer. In this paper, 1 t of MFCF product was used as the functional unit to evaluate the environmental risk in the stages of transportation, production and field fertilization. The single factor sensitivity analysis was carried out to quantitatively analyze the effects of change of transportation distance and mechanical production efficiency on environmental impacts resulted from MFCF. The most prominent impact category in the life cycle of MFCF was non-renewable resource depletion; its environmental impact index was 1.84×10−2 and contribution rate was 39.74%. The second most prominent impact was terrestrial eutrophication; its environmental impact index was 1.43×10−2 and contribution rate was 30.75%. The non-renewable resource depletion and terrestrial eutrophication were mainly affected in production and field application stages. Improving coal-fired power generation efficiency, increasing MFCF production efficiency, exploring clean transportation and promoting balanced fertilization were effective ways to reduce the burden on the environment caused by MFCF. The present study can be considered as a useful methodological framework for a deeper understanding of key environmental impacts related to MFCF production. © 2017 Elsevier Ltd


Zhong L.,University of Science and Technology of China | Zhong L.,Key Laboratory of Land Consolidation and Rehabilitation | Wang J.,Key Laboratory of Land Consolidation and Rehabilitation
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2017

Land consolidation is a process of re-organization and re-optimization of land resource and its utilization. The change of land resource and its utilization has a profound influence on the circulation process of material flow and energy flow between habitat patches, thus changing the quality and distribution pattern of the regional habitat. Da'an City is located in the Songnen Plain, which is flat, and rich in cultivated land reserve resources and water resources, and is one of the most potential areas of agricultural development in China. This paper took the land consolidation major project area of Da'an City as an example, and analyzed the influence of land consolidation on habitat quality based on the model of InVEST (integrated valuation of ecosystem services and tradeoffs). The data used in the study was the 1:10000 land use map of the land consolidation project area in 2008, 2011 and 2014, which represented the time before, during and after the land consolidation. Based on the ArcGIS 10.0 software, the land use vector data were output as the raster data of 30 m × 30 m, which were used as the evaluation unit of the habitat quality of the project area. The results showed that: 1) Cultivated land, saline alkali land and grassland were the main land use types in the project area. After land consolidation, a large amount of saline alkali land was converted into arable land, and the proportion of arable land area in the total area of the project increased from 14.43% to 71.19%. The degree of landscape fragmentation was significantly decreased after land consolidation. 2) The overall habitat quality of Da'an land consolidation project area was poor. The area of which the habitat quality score was between 0 and 0.1 accounted for 54.62%-72.03% of the land consolidation project area. The main reason for this phenomenon was that for the land use types whose habitat quality was higher, such as woodland and grassland, their areas were small and the distributions were dispersed; the areas of cultivated land and saline alkali land were larger, but the habitat quality of the 2 kinds of land use types was lower. 3) Before land consolidation, the score of habitat quality was 0.194; the score of habitat quality was reduced to 0.189 during land consolidation, and was increased to 0.214 after land consolidation. Before, during and after the land consolidation, the habitat quality showed a trend of first decreasing and then increasing. Saline alkali land is one of the threat factors of habitat quality, and its area in the former project area was large, which has a negative impact on the quality of the whole project area. The disturbance of human during the land consolidation project has reduced the habitat quality of the project area. After land consolidation, the score of habitat quality was increased to 0.214. The main reason was that the land use pattern has been optimized owing to land consolidation. At the same time, a large increase in arable land has made the grain production capacity of the project area increase significantly. 4) Overall, the land consolidation project has improved the habitat quality of the project area, but the habitat quality score has experienced a process of first decrease and then increase. In the 3-4 years after land consolidation, the quality of the habitat was the lowest since land consolidation completed, and it was only 0.06 higher than that before land consolidation. And then the quality of the habitat began to improve gradually. After land consolidation, there would be a small amount of arable land changed to saline land again, so the habitat quality of the project area decreased. However, the maintenance work would improve these saline alkali land and change them to arable land, so the quality of the habitat would rise again. © 2017, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.


Li C.,China University of Geosciences | Wu K.,China University of Geosciences | Wu K.,Key Laboratory of Land Consolidation and Rehabilitation | Wu J.,China University of Geosciences
Environment, Development and Sustainability | Year: 2017

In recent years, Beijing, Tianjin and Hebei region has undergone a significant diversification in the respect of urban land use. Based on the quantity, degree and regional change of land use in Beijing, Tianjin and Hebei region during the past 14 years, this paper analyzed the driving forces of land use change from the perspective of socio-economic development. The result showed that from 2000 to 2013, land use change varies greatly: Cultivated land, grass land and unused land reduce greatly, while garden land, forest land, other agricultural land and construction land grow continuously. The differences of the annual rate of main land use types of the 13 cities in Beijing, Tianjin and Hebei region show that garden land and forest land increase, while other land use types decreased in Beijing; construction land grows, while other land use types reduce in the other 12 cities in the study area. During the study period, land use in Beijing, Tianjin and Hebei region is active; driving force of land use change, which mainly includes economy developing and urbanization factor, has increased over years. © 2017 Springer Science+Business Media Dordrecht


Wang J.,University of Science and Technology of China | Wang J.,Key Laboratory of Land Consolidation and Rehabilitation | Bai Z.,University of Science and Technology of China | Bai Z.,Key Laboratory of Land Consolidation and Rehabilitation | Yang P.,China Agricultural University
PLoS ONE | Year: 2013

The byproducts of flue gas desulfurization (BFGD) are a useful external source of Ca2+ for the reclamation of sodic soils because they are comparatively cheap, generally available and have high gypsum content. The ion solution composition of sodic soils also plays an important role in the reclamation process. The effect of BFGD on the soluble salts composition and chemical properties of sodic soils were studied in a soil column experiment. The experiment consisted of four treatments using two different sodic soils (sodic soil I and sodic soil II) and two BFGD rates. After the application of BFGD and leaching, the soil soluble salts were transformed from sodic salts containing Na2CO3 and NaHCO3 to neutral salts containing NaCl and Na2SO4. The sodium adsorption ratio (SAR), pH and electrical conductivity (EC) decreased at all soil depths, and more significantly in the top soil depth. At a depth of 0-40 cm in both sodic soil I and sodic soil II, the SAR, EC and pH were less than 13, 4 dS m-1 and 8.5, respectively. The changes in the chemical properties of the sodic soils reflected the changes in the ion composition of soluble salts. Leaching played a key role in the reclamation process and the reclamation effect was positively associated with the amount of leaching. The soil salts did not accumulate in the top soil layer, but there was a slight increase in the middle and bottom soil depths. The results demonstrate that the reclamation of sodic soils using BFGD is promising. © 2013 Wang et al.


Zhang L.,University of Science and Technology of China | Wang J.,University of Science and Technology of China | Wang J.,Key Laboratory of Land Consolidation and Rehabilitation | Bai Z.,University of Science and Technology of China | And 2 more authors.
Catena | Year: 2015

Vegetation reconstruction on opencast coal-mine dumps is an effective way to reduce runoff and soil erosion and is a key to restoring ecosystems in ecologically sensitive regions. To investigate the effects of vegetation on runoff and erosion, a field experiment involving eight erosion plots was conducted on a dump at the Antaibao opencast coal mine in, Shanxi Province. The plots were divided into two location groups, platforms and slopes. Each plot was planted with a typical vegetation pattern. The volumes of runoff and soil erosion during each rainfall event were recorded during the rainy season. The results showed that plots on the platforms experienced a larger volume of runoff than plots on the slopes, while the slope plots generated a larger value of soil erosion than the platform plots. Vegetation restoration has different impacts on runoff and soil erosion. A plot covered with 1-year-old Robinia pseudoacacia and Hippophae rhamnoides was most effective in terms of soil conservation; the plots covered with 5-year-old mixed legume plants and 5-year-old mixed grass-shrub-arbor forest were most effective overall in preventing both runoff and soil erosion. Over the long term, vegetation can increase soil organic matter, improve soil physical properties and soil anti-erodibility, and reduce runoff and erosion to a safe level. This study provides a theoretical basis and technical support for land reclamation and soil and water conservation in vulnerable ecological mining regions of a loess plateau. © 2015 Elsevier B.V.


Zhao Z.,University of Science and Technology of China | Zhao Z.,Key Laboratory of Land Consolidation and Rehabilitation | Xi M.,University of Science and Technology of China | Jiang G.,University of Science and Technology of China | And 4 more authors.
Journal of Hazardous Materials | Year: 2010

Heavy metals contamination of soil is a widespread global problem. Chelant assisted phytoextraction has been proposed to improve the efficiency of phytoextraction which involves three subsequent levels: transfer of metals from the bulk soil to the root surfaces, uptake into the roots and translocation to the shoots. However, most studies focused on the first level. A hydroponic experiment, which addresses the latter two levels, was conducted to study the effects of EDTA, EDDS and IDSA on the uptake and the distribution of Pb, Zn, Cu and Cd in the apoplast and the symplast of roots of maize (Zea mays, L.). The concentrations of the metals (with exception of Zn) in the shoots were increased significantly by addition of all the chelants. EDTA was most effective for Pb uptake and IDSA was interestingly most effective for Cd uptake. Pb in the roots with EDTA was mostly distributed in the apoplast, while Zn, especially with IDSA, was mostly located in the symplast. The results indicated that, the capacity of chelant to enhance the nonselective apoplastic transport of metal may be most important for chelant enhanced phytoextraction. © 2010 Elsevier B.V.


Wang J.,University of Science and Technology of China | Yang R.,Shihezi University | Bai Z.,Key Laboratory of Land Consolidation and Rehabilitation
Ecological Engineering | Year: 2015

Drastically disturbed minesoils can result in a significant loss of soil organic carbon (SOC) and total nitrogen (TN). To assess the effect of mining activities on minesoils and to track the changes in reclaimed soil quality, the variability of SOC and TN concentrations in the Shanxi Pingshuo Antaibao opencast coal-mine inner dump after dumping and before reclamation was analyzed using geostatistics, and a number of soil monitoring points were evaluated after land reclamation. Soil samples were collected from depths of 0-20cm, 20-40cm, 40-60cm and 60-80cm at 78 sampling sites in the study area over an area of 0.44km2. The coefficient of variation (CV) for TN was the least at <15% for depths of 0-40cm and 60-80cm. For TN at a depth of 40-60cm and the SOC at all depths, the CV was moderate at 15-35%. Interpolation using kriging displayed a high heterogeneity of TN and SOC, and the spatial structure of the original landform was partially or completely destroyed. Revegetation was an important measure for increasing the accretion of C and N compared to an unmined site. The kriging-interpolated maps were a very valuable tool in monitoring soil properties after land reclamation at the field scale, and RMSE can be used to determine the number of sampling point for soil properties. © 2015 Elsevier B.V.


Zhao Z.,University of Science and Technology of China | Zhao Z.,Lille University of Science and Technology | Shahrour I.,Lille University of Science and Technology | Bai Z.,University of Science and Technology of China | And 4 more authors.
European Journal of Soil Biology | Year: 2013

Soil development is the key process of mine spoil reclamation. To investigate the effects of different plant species and reclamation time on the soil development, 9 plots in the reclaimed spoils of Pingshuo opencast coal mine in Shanxi, China were established and the physical, chemical and microbiological properties of the soils were analyzed. The results showed that, soil bulk density and field capacity in plots with longer reclamation time were statistically different from plots with younger vegetation in both the 0-20 cm and 20-40 cm soil layers. Accordingly, values of organic matter and available nitrogen levels showed a significant increase in both 0-20 cm and 20-40 cm depth with reclamation time increasing and the top layer marked higher value except for some individual data. The organic matter in plot 8 in 0-20 cm depth with 13-year old vegetation reached 9.45 g kg-1, about 2.5-, 2.0- and 3.1-fold higher than the plots of 1-, 3- and 4-year old vegetation respectively. Total microbial amount showed a positive correlation with contents of organic matter which reached 1436.72 × 105 g-1 in plot 8 with 13-years old vegetation, about 11.3-fold greater than plot 1 of 1-yr old vegetation. Plots planted with sea buckthorn (Hippophae rhamnoides ssp. sinensis) singly or mixed with other species tend to develop better soil aggregation and microbiological properties than other plots, which may be due to its particular biological characteristics, developed root system and high growth rate in the first 4-6 year and 8-10 year, indicating that sea buckthorn may be a good species choice for activating soil development in the early stage of reclamation. © 2012.


Wang Y.Z.,University of Science and Technology of China | Zhao Z.Q.,University of Science and Technology of China | Zhao Z.Q.,Key Laboratory of Land Consolidation and Rehabilitation | Jiang G.Y.,University of Science and Technology of China
Applied Mechanics and Materials | Year: 2014

The effects of phosphates rock (PR) with different particle sizes {D97<4.26 (the diameters of 97% of the particles are less than 4.26 μm.), <36.83, <71.12 and <101.43 μm} and different concentration (2.5% and 5% content of try soil weight) on immobilizing heavy metal-contaminated soils by a perennial ryegrass greenhouse experiment are conducted. Results indicate that remediation effect of applying 5% content is more significant than 2.5%. Ryegrass biomass in shoots in the former applying content is much larger than the latter and for both roots and shoots, PR reduces the absorption and accumulation of Pb, Cu and Zn, but no significant influence on Cd. While adding the same amount of different sizes of PR doesn't show significant differences between these treatments. Pb content at 5% level of the finest size of PR is the minimum, decreased by 33% and 56% compared to the control in roots and shoots respectively, which was also suitable for Zn, decreased by 12.65% and 39.61% respectively. © (2014) Trans Tech Publications, Switzerland.


Wang J.,Key Laboratory of Land Consolidation and Rehabilitation | Dun Y.,University of Science and Technology of China | Guo Y.,Key Laboratory of Land Consolidation and Rehabilitation | Dou S.,Jilin Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

Songnen plain is the main grain strategy reserve area of China, and it is also one of the three largest soda saline-alkali soil regions in the world. Soil salinization severely restricts the sustainable development of agriculture and the improvement of people's living standards. The land consolidation major projects officially launched in the west of Jilin Province in 2007 provides an effective way for comprehensive controlling salinity land. In the process of land consolidation, one of the most important problems need to be addressed was how to combine land consolidation with soil improvement to realize the purpose of increasing cultivated land areas and improving salinity soil. In order to study the Western Songnen Plain land consolidation effect on improving salinity soil, this paper took the land consolidation project in Zhenlai county of Jilin Province as study area, selected the original cultivated land, saline-alkali land and newly-added cultivated land as plots, adopted the methods of classical statistical analysis and canonical correspondence analysis to comparative study the differences of soil physical and chemical properties and soil ionic composition of different plots. And then we put forward related suggestions for land consolidation and improving salinity soil. The results showed that, in 0-20 and >20-40 cm soil layer, soil electrical conductivity of newly-added cultivated land was significantly decreased by 44.9% and 37.0% than saline-alkali land (P<0.05), but significantly higher than original cultivated land by 35.7% and 58.6%. The total actions and total anions of newly-added cultivated land were significantly lower than saline-alkali land (P<0.05). The exchange sodium percentage of saline-alkali land was around 38% and pH value was close to 10.0, that was classified to severe salinity soil. While the newly-added cultivated land soil exchange sodium percentage was 18.0% and 21.6%, and soil pH value was less than 9.0, that was classified to moderate salinity soil and close to the original cultivated land. Newly-added cultivated soil organic matter was higher than saline-alkali land by 33.4% and 61.3% significantly (P<0.05), but it was significantly lower than original cultivated 21.5% in 0-20 cm soil layer. Newly-added cultivated soil cation exchange capacity was increased by 16.7% and 25.1% than saline-alkali land (P>0.05), and it's slightly higher than original cultivated land. Canonical correspondence analysis results showed that soil physical and chemical properties and ionic composition had significant correlation with plot type distribution. Plot type changed from saline-alkali land to newly-added cultivated land was the process of soil salinization indices decreasing and fertility indices rising in the level of soil physical and chemical properties, and also the process of bicarbonate ion, carbonate ion and sodium ion content reduction in the level of soil ionic composition. Overall, the land consolidation project in Western Songnen Plain could improve salinity soil effectively, but the soil quality of newly-added cultivated land is still lower than the original cultivated land. Therefore, we suggest to improve salinity soil better through improvement of irrigation and drainage system, reasonable land leveling measure and scientific farming.

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