scholarly journals Remote Sensing Monitoring and Ecological Risk Assessment of Landscape Patterning in the Agro-Pastoral Ecotone of Northeast China

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Min Guo ◽  
Shijun Wang
Keyword(s):  
Remote Sensing ◽  
Risk Assessment ◽  
Land Use ◽  
Ecological Risk ◽  
Risk Index ◽  
Population Pressure ◽  
Survey Method ◽  
Practical Case ◽  
Ecological Risk Index ◽  
Ecosystem Risk

The agro-pastoral ecotone, an ecological transition zone connecting adjacent areas of agricultural planting area and grassland animal husbandry, has three features: a complex natural condition, relatively pronounced population pressure, and a fragile ecological environment. In this study, we conducted an ecosystem risk assessment in the western part of Jilin Province, China, based on multiscale and multitemporal remote sensing images and land-use data. Furthermore, we focused on land-use change from 1995 to 2015 by applying the dynamic change information survey method and carrying out a transfer track analysis. The results revealed three main findings. (1) The ecological risk index at the scale of 3 km × 3 km harbors significant spatial correlation. (2) The ecological risk index of unutilized land, forest land, and grassland is relatively high for each, and their anti-interference ability is weak, while the ecological risk index of construction land and water area is the lowest. (3) Human interference, e.g., construction activities and cultivated land occupation, is the leading factor driving the exacerbation of ecological risk and frequent land-use type conversions. At the study period’s end, a trend of slight contraction in the high-risk areas was found, indicating that land-use regulation and land protection policies have had significantly positive impact upon the lands’ ecological value. The overall study identified a reasonable research scale for eco-environmental risk assessment and discerned relationships between regional land-use changes through geospatial analysis. Moreover, our findings can help provide practical case study information applicable to similar regions with agro-pastoral ecotones.

scholarly journals INVESTIGATION AND ECOLOGICAL RISK ASSESSMENT OF Pb, As AND Hg IN SEDIMENT OF TAM GIANG-CAU HAI LAGOON, THUA THIEN HUE PROVINCE

2018 ◽  
Vol 56 (2C) ◽  
pp. 72-79
Author(s):  
Dang Van Hieu
Keyword(s):  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Toxic Elements ◽  
Risk Index ◽  
Sediment Quality ◽  
Technical Regulation ◽  
Ecological Risk Index ◽  
Ship Construction ◽  
Dry Seasons

Tam Giang - Cau Hai lagoon plays an important role in coastal ecosystems of Thua Thien Hue Province. The present study aims to determine three toxic elements (Pb, As, Hg) in the surface sediment and to assess the ecological risk of the selected metal in this area. Sediment samples and water quality were collected at 9 stations in rainy and dry seasons. Toxic metals were determined following the USEPA methods 3050A for measuring by atomic absorption spectrophotometer. Concentrations of Hg, Pb and As in the study area were in the range of 0-2.64 mg/kg, 4.83-22.13 mg/kg and 1.18-6.24 mg/kg, respectively. The results showed that concentration of Hg in sediment of most sampling sites were exceeded the National Technical Regulation on Sediment Quality (QCVN 43:2012/BTNMT), while Pb and As were below the regulated level. Ecological risk assessment presented that investigated metals posed medium to high risk to ecology. The estimated ecological risk index (ERI) ranged from 43.9 to 582.9 with the order of Hg>As>Pb. The highest ecological risk was found at the stations closed to the Thuan An inlet and ship construction area.

scholarly journals Ecological Risk Assessment, Interpolation, and Pollution Source Identification of Toxic Elements in Soils and Leaves of the Vineyard of Malayer County

2019 ◽  
Vol 6 (2) ◽  
pp. 83-91
Author(s):  
Mohamad Parsi Mehr ◽  
Samar Mortazavi
Keyword(s):  
Land Use ◽  
Spatial Distribution ◽  
Ecological Risk ◽  
Toxic Elements ◽  
Risk Index ◽  
Garden Soil ◽  
Pollution Level ◽  
Copper Contamination ◽  
Study Region ◽  
Ecological Risk Index

Grape is a strategic product in the county of Malayer. Despite the great importance and existence of polluted resources in the vicinity of vineyards in Malayer, there are few studies conducted in this regard. To evaluate the pollution level of toxic elements in these vineyards, 20 sampling stations were selected randomly and samples of garden soil and leaves of grapevine species were collected. After the acidic digestion of the samples, the concentrations of the heavy metals were measured using atomic absorption spectrometer. Then, the indices of contamination factor (Cf), geoaccumulation index (Igeo), biological accumulation coefficient (BAC), and ecological risk index (RI) were calculated. According to the results obtained for Igeo and Cf indices, the soil in the study region was moderately contaminated with copper. However, the ecological risk index and BAC of the studied region were low. To investigate the spatial distribution of copper in the studied region, the spatial distribution map was prepared. To locate the source of copper contamination and investigate the effect of various land uses on the amount of contamination, land use map (LUM) of vineyards was generated. To this end, images were downloaded from Landsat Satellite, and after the exertion of various corrections on the images based on the supervised classification method, the LUM with agricultural, residential, vineyard, brick furnace and pasture classes was prepared. The comparison of the LUM and the copper contamination map illustrated that the copper contamination was higher in the places with urban and adobe furnace land-use types.

A new comprehensive ecological risk index for risk assessment on Luanhe River, China

2017 ◽  
Vol 40 (5) ◽  
pp. 1965-1978 ◽  
Author(s):  
Kun Bao ◽  
Jing-ling Liu ◽  
Xiao-guang You ◽  
Xuan Shi ◽  
Bo Meng
Keyword(s):  
Risk Assessment ◽  
Ecological Risk ◽  
Risk Index ◽  
Ecological Risk Index

Pollution Characteristics and Ecological Risk Assessment of Hg and As in Sediments from WuHe Wetland

2014 ◽  
Vol 1051 ◽  
pp. 552-556
Author(s):  
Xiao Tian Ma ◽  
Ren Jun Liang ◽  
Ji Cai Qiu ◽  
Li Zhi Wang ◽  
Xiu Zhen Wang
Keyword(s):  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Risk Index ◽  
Pollution Index ◽  
Background Level ◽  
Potential Ecological Risk ◽  
Step Method ◽  
Ecological Risk Index ◽  
Potential Ecological Risk Index

This study used four acid digestion methods and the Tessier five-step method to analyze the content characteristics of the elements Hg and As in samples. Further measures included the enrichment factor, geoaccumulation index and potential ecological risk index, for a comprehensive ecological risk assessment of pollution by Hg and As. The average contents were 1.16 mg·kg-1 for Hg and 46.76 mg·kg-1 for As.The two class natural background level was compared to evaluate the cumulative pollution index: among all sampling points, the Hg Igeo mean was-0.55, indicating this element was non-polluting, and the As Igeo mean of 0.23 indicated pollution-free to light pollution. The overall potential ecological risk index (RI) had a mean of 64.93, which indicated slight potential ecological harm to the wetland system.

Method of Ecological Risk Assessment for Land Use Based on Remote Sensing Image

2021 ◽  
Vol 7 (6) ◽  
pp. 6228-6246
Author(s):  
Ling Chai
Keyword(s):  
Remote Sensing ◽  
Risk Assessment ◽  
Land Use ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Remote Sensing Image ◽  
Indicator System ◽  
Ecological Effects ◽  
Risk Indicator ◽  
The Impact

Ecological risk assessment for land use can provide the basis for scientific evaluation of the impact of current human activities on land and its ecological effects. For the issue on ecological risk of land use, the method of ecological risk assessment for land use based on remote sensing image is proposed. Using remote sensing image as the main data of land use change and ecological effects, the land use situation is classified by pre-processing and analysis of remote sensing image. Combined with the estimation of solar radiation, spatial interpolation of meteorological data, atmospheric correction and geometric fine correction operations, remote sensing data is processed to improve the classification accuracy of the target area. According to the remote sensing image of land use and the analysis results of the data, as well as the dynamic model and the comprehensive evaluation conceptual model for land use, the multi-indicator assessment framework of ecological risk for land use is designed and the risk indicator system is constructed. Furthermore, the ecological risk assessment for land use in the entire region and sub-regions is completed. The research results show that the proposed method can effectively realize the ecological risk assessment for land use in the study area, which has good robustness.

scholarly journals Effects of Urbanization Expansion on Landscape Pattern and Region Ecological Risk in Chinese Coastal City: A Case Study of Yantai City

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Di Zhou ◽  
Ping Shi ◽  
Xiaoqing Wu ◽  
Jinwei Ma ◽  
Junbao Yu
Keyword(s):  
Land Use ◽  
Ecological Risk ◽  
Landscape Pattern ◽  
Risk Index ◽  
Ecological Risk Index ◽  
Landscape Pattern Metrics ◽  
Pattern Metrics ◽  
Intensity Index ◽  
Yantai City ◽  
Landscape Ecological

Applied with remote sensing, GIS, and mathematical statistics, the spatial-temporal evolution characteristics of urbanization expansion of Yantai city from 1974 to 2009 was studied. Based on landscape pattern metrics and ecological risk index, the landscape ecological risk from the landscape pattern dynamics was evaluated. The results showed that the area of urban land increased by 189.77 km2with average expansion area of 5.42 km2 y−1from 1974 to 2009. The urbanization intensity index during 2004–2009 was 3.92 times of that during 1974–1990. The land use types of urban land and farmland changed greatly. The changes of landscape pattern metrics for land use patterns indicated that the intensity of human activities had strengthened gradually in study period. The landscape ecological risk pattern of Yantai city shaped half-round rings along the coastline. The ecological risk index decreased with increase of the distance to the coastline. The ratio of high ecological risk to subhigh ecological risk zones in 2009 was 2.23 times of that in 1990. The significant linear relationship of urbanization intensity index and regional ecological risk indicated that the anthropological economic activities were decisive factors for sustainable development of costal ecological environment.

scholarly journals Reforestation Impacted Soil Heavy Metal Fractionation and Related Risk Assessment in the Karst Area, Southwest China

Forests ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 891
Author(s):  
Qian Zhang ◽  
Guilin Han ◽  
Xingliang Xu
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Ecological Risk ◽  
Southwest China ◽  
Risk Index ◽  
Contamination Factor ◽  
Karst Area ◽  
Risk Assessment Code ◽  
Bcr Sequential Extraction ◽  
Soil Heavy Metals

Human agricultural activities have resulted in widespread land degradation and soil contamination in the karst areas. However, the effects of reforestation after agricultural abandonment on the mobility risks and contamination of heavy metals have been rarely reported. In the present study, six soil profiles were selected from cropland and abandoned cropland with reforestation in the Puding karst regions of Southwest China. The Community Bureau of Reference (BCR) sequential extraction method was used to evaluate the compositions of different chemical fractions of soil heavy metals, including Fe, Mn, Cr, Zn, Ni, and Cd. The total contents of Cr, Ni, Zn, Cd, and Mn in the croplands were significantly higher than those in the abandoned croplands. For all soils, Cr, Ni, Zn, and Fe were mainly concentrated in the residual fractions (>85%), whereas Mn and Cd were mostly observed in the non-residual fractions (>65%). The non-residual fractions of Cd, Cr, Ni, and Zn in the croplands were higher than those in the abandoned croplands. These results indicated that the content and mobility of soil heavy metals decreased after reforestation. The individual contamination factor (ICF) and risk assessment code (RAC) showed that Cd contributed to considerable contamination of karst soils. The global contamination factor (GCF) and potential ecological risk index (RI) suggested low contamination and ecological risk of the investigated heavy metals in the croplands, moreover they can be further reduced after reforestation.

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