Distribution characteristics of iron, carbon, nitrogen and phosphorus in the surface soils of different land use types near Xingkai Lake

2018 ◽  
Vol 19 (1) ◽  
pp. 275-285 ◽  
Author(s):  
Luying Wang ◽  
Xiaofei Yu ◽  
Zhenshan Xue ◽  
Lili Huo ◽  
Ming Jiang ◽  
...  
Keyword(s):  
Land Use ◽  
Distribution Characteristics ◽  
Nitrogen And Phosphorus ◽  
Surface Soils ◽  
Land Use Types

scholarly journals Distribution Characteristics and Pollution Assessment of Soil Heavy Metals under Different Land-Use Types in Xuzhou City, China

2019 ◽  
Vol 11 (7) ◽  
pp. 1832 ◽  
Author(s):  
Aman Fang ◽  
Jihong Dong ◽  
Yingli An
Keyword(s):  
Heavy Metals ◽  
Land Use ◽  
Organic Carbon ◽  
Mining Area ◽  
Distribution Characteristics ◽  
Grassland Soils ◽  
Risk Levels ◽  
Land Use Types ◽  
The Mean ◽  
Mean Concentration

Xuzhou, as a mining city in China, has been experiencing 130 years of coal mining and processing. To explore the spatial distribution characteristics and pollution status of soil heavy metals (Cr, Cd, As, Hg, Zn, and Pb) under different land-use types, a total of 2697 topsoil samples were collected in all of the areas (except for water) of Xuzhou in 2016. Overall, the mean concentrations of Cr (70.266 mg/kg), Cd (0.141 mg/kg), As (10.375 mg/kg), Hg (0.036 mg/kg), Zn (64.788 mg/kg), and Pb (24.84 mg/kg) in Xuzhou soils were lower than the environmental quality standard for soils (GB15618-1995). However, the mean concentrations of Cr, Hg, and Pb exceeded their corresponding background values, with the mean concentration of Hg being almost three times its background value. For different land-use types, the highest mean concentration of Cr was concentrated in grassland soils. The mean concentrations of Cd, As, Zn, and Pb in mining area soils were higher than those in the other soils. The mean concentration of Hg was the highest in the built-up area soils. Based on the potential ecological risk assessment, the forestland, garden land, grassland, and others were at low and moderate risk levels, the farmland and mining area were at low, moderate, and high risk levels, and the built-up area was at various risk levels in Xuzhou. There was a significant positive correlation between Cr, Pb, and Hg concentrations and the corresponding organic carbon contents in the farmland, built-up area, garden land, forestland, and other soils ( p < 0.01 ). A high degree of correlation was found between Cr and Hg concentrations, as well as organic carbon contents in grassland soils, with values of p < 0.05 and p < 0.01 , respectively. An obvious correlation could be seen between Hg concentrations and organic carbon contents in mining area soils ( p < 0.01 ).

scholarly journals Fluxes of Nitrogen, Phosphorus, and Dissolved Organic Carbon in the inflow of the Lehnmühle reservoir (Saxony) as compared to streams draining three main land-use types in the catchment

2012 ◽  
Vol 32 ◽  
pp. 1-7 ◽  
Author(s):  
R. Benning ◽  
K. Schua ◽  
K. Schwärzel ◽  
K. H. Feger
Keyword(s):  
Land Use ◽  
Assessment Tool ◽  
Nitrogen And Phosphorus ◽  
Land Use Types ◽  
Doc Concentration ◽  
Change Impact ◽  
Agricultural Areas ◽  
The Impact ◽  
Water Assessment ◽  
Nitrogen Phosphorus

Abstract. The aim of this study was to assess the impact of land-use on inputs of nitrogen, phosphorus, and DOC into the inflow of the Lehnmühle reservoir (drinking water supply). Land-use in the study area is dominated by forest, with smaller proportions of grassland and crops. Water quality was analyzed for the hydrological years 2010 and 2011 at the outlets of three small catchments with homogenous land-use (crops, grassland and forest) and at the outlet of the watershed. The highest nitrogen and phosphorus concentrations were observed in the streams draining the agricultural areas, and the lowest concentrations were found in the forest catchment. The DOC concentration was highest at the outlet of the watershed whereas the concentrations in the small homogeneous catchments were lower. The information collected about the land-use dependent matter exports in these study areas will be used for climate change impact modeling with the Soil and Water Assessment Tool.

scholarly journals Effects of Land Use Types on CH4 and CO2 Production Potentials in Subtropical Wetland Soils

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1856
Author(s):  
Jiaxing Xu ◽  
Derrick Y. F. Lai ◽  
Suvadip Neogi
Keyword(s):  
Land Use ◽  
Co2 Production ◽  
Wetland Soils ◽  
Production Potential ◽  
Surface Soils ◽  
Subtropical Wetland ◽  
Freshwater Pond ◽  
Land Use Types ◽  
Effects Of Land Use ◽  
Aerobic And Anaerobic

Changes in land use types can alter the soil and environmental characteristics of wetlands, which in turn influence the magnitude of greenhouse gas production by soil microbes. However, the effects of land use change on the production potential of methane (CH4) and carbon dioxide (CO2) in subtropical wetland soils and the underlying controls are still largely unknown. In this study, we examined the soil CH4 and CO2 production potentials under five different land use types (natural mangrove, Gei Wai water channel, Gei Wai forest, reedbed, and freshwater pond) and their relationships with soil physico-chemical properties in a subtropical wetland in Hong Kong using aerobic and anaerobic laboratory incubation experiments. Our results showed an overall decreasing trend of CH4 and CO2 production potentials down the soil profile at all sites, which could be attributed to a reduction in the concentrations of soil organic matter (SOM), total Kjeldahl nitrogen (TKN) and ammonium nitrogen (NH4+-N). Moreover, the soil CH4 and CO2 production potentials varied significantly in the surface soils among land use types, but were more similar across the sites in the deeper soils. The conversion of natural mangrove to other land use types significantly reduced both the aerobic and anaerobic CO2 production potentials in the top 10 cm soils, except for Gei Wai forest, which demonstrated significantly higher CO2 production rates (61.15–97.91 μg g−1 day−1). Meanwhile, the mean CH4 production potential in the surface soils of natural mangrove (0.05 μg g−1 d−1) was significantly lower than that in the Gei Wai forest and Gei Wai channel (0.26–0.27 μg g−1 day−1) but slightly higher than that in the freshwater pond and reedbed (0.00–0.02 μg g−1 day−1). The high soil CH4 and CO2 production potentials observed in the Gei Wai forest could be explained by the high soil concentrations of SOM, TKN and NH4+-N. On the other hand, the lower anaerobic CH4 and aerobic CO2 productions observed in the reedbed could be attributed to the lower concentrations of NH4+-N and available phosphorus. Our findings highlighted the significant impacts of land use types on the CH4 and CO2 production potentials of subtropical wetland soils, which had practical implications for wetland management for climate change mitigation.

Influence of Land Use Types on Levels and Compositions of PAEs in Soils from the Area around Hongze Lake

2012 ◽  
Vol 610-613 ◽  
pp. 2916-2924
Author(s):  
Jun Gao ◽  
Hai Feng Zhou
Keyword(s):  
Land Use ◽  
Surface Soil ◽  
Phthalate Esters ◽  
Contamination Level ◽  
Plastic Film ◽  
Surface Soils ◽  
Organic C ◽  
Hongze Lake ◽  
Land Use Types ◽  
Total Organic C

6 congeners of phthalate esters (PAEs) were analyzed in soils with various land use types from the area around Hongze Lake, the fourth largest freshwater lake in China. The total concentrations of 6 congeners (Σ6PAEs ) were 5.070-2.067, 0.723-2.050, 0.331-1.645, 0.002-0.173 mg kg-1 in surface soil from plastic film greenhouse (PG), conventional vegetable fields (CV), plastic film greenhouse-rice rotated fields (PR), and uncultured land (UL), respectively. DnBP and DEHP were dominant species in PAEs averagely accounted for 46.4% and 47.0% of the Σ6PAEs concentrations in all surface soils. And congener percent composition of PAEs in surface soils from uncultured land was considerably different from cultured soils. Vertical distribution of PAEs in soil profile was influenced by land use type, congener species, and the content of congener in surface soil, etc. However, the amounts of PAEs in surface soil accounted more than 58.5% of total amounts in soils. In addition, no significant relationship was observed between total organic C or pH and the concentrations of PAEs in surface soil. The contents of PAEs in soils from the area around Hongze Lake were related with land use types, especially with the use of plastic film. And the general contamination level in soil was comparable or lower than those present in other areas. According to our knowledge, this is the first study to examine the present status of PAEs in soils from the area around Hongze Lake

Land Use Influence on Carbon, Nitrogen, and Phosphorus in Size Fractions of Sandy Surface Soils

Soil Science ◽  
2013 ◽  
Vol 178 (12) ◽  
pp. 654-661 ◽  
Author(s):  
Christine M. Bliss ◽  
Nicholas B. Comerford ◽  
Donald A. Graetz ◽  
Sabine Grunwald ◽  
Aja M. Stoppe
Keyword(s):  
Land Use ◽  
Nitrogen And Phosphorus ◽  
Surface Soils ◽  
Size Fractions

scholarly journals Nitrogen and phosphorus budget of different land use types in hilly area of Lake Taihu upper- river basin

2012 ◽  
Vol 24 (6) ◽  
pp. 829-837 ◽  
Author(s):  
HAN Ying ◽  
◽  
LI Hengpeng ◽  
NIE Xiaofei ◽  
XU Xibao
Keyword(s):  
Land Use ◽  
River Basin ◽  
Lake Taihu ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Budget ◽  
Hilly Area ◽  
Land Use Types

scholarly journals Characteristics of Non-Point Source Pollution under Different Land Use Types

2020 ◽  
Vol 12 (5) ◽  
pp. 2012 ◽  
Author(s):  
Jun Yang ◽  
Jiping Liang ◽  
Gaihe Yang ◽  
Yongzhong Feng ◽  
Guangxin Ren ◽  
...  
Keyword(s):  
Land Use ◽  
Point Source ◽  
Rainfall Intensity ◽  
Phosphorus Content ◽  
Dry Season ◽  
Water Bodies ◽  
Point Source Pollution ◽  
Nitrogen And Phosphorus ◽  
Land Use Types ◽  
Non Point Source Pollution

Non-point source pollution (NPSP) is a major challenge for current global water resources. The output characteristics of pollutants under different land use types are very important for controlling NPSP. In this study, long-term positioning monitoring and an analysis of rainfall runoff from different land use types were used to evaluate a typical watershed in the water source area of the middle route of the South-to-North Water Diversion Project (MR-SNWDP). The results show significant differences in nitrogen and phosphorus content in the runoff water bodies of various land use types. The nitrogen and phosphorus content in the MR-SNWDP was directly related to rainfall intensity and the fertilization period in the runoff following fertilization of farmland and vegetable plots. This nitrogen and phosphorus content was also observed to be significantly higher in the fertilization period than in other periods. The loss of nitrogen and phosphorus in forestland was greatly affected by rainfall intensity. Nitrogen in runoff comes primarily from farmland and vegetable fields, where its main form is nitrate nitrogen (NN). Vegetable fields are the main source of phosphorus, where its primary form is soluble phosphate (PO43−-P). Nitrogen and phosphorus have a defined incubation period during the dry season. Farmland and vegetable fields receive less rainfall during the dry season and it is difficult to form effective runoff; this allows nitrogen and phosphorus deposition. The runoff formed by the first rainfall at the beginning of the flood season (April or May) will carry a large amount of nitrogen and phosphorus from the soil into water bodies. Therefore, it is crucial to pay careful attention to the season when attempting to control NPSP.

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