Spatial distribution and main controlling factor of cadmium accumulation in agricultural soils in Guizhou, China

2021 ◽  
pp. 127308
Author(s):  
Yunxia Zhang ◽  
Yong Wu ◽  
Bo Song ◽  
Lang zhou ◽  
Fopeng Wang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Agricultural Soils ◽  
Cadmium Accumulation ◽  
Controlling Factor

Spatial content and variability of mercury in agricultural soils in the province of Valencia (Spain), with an emphasis on those dedicated to rice crop

2021 ◽  
Author(s):  
Rafael Boluda ◽  
Luis Roca Pérez ◽  
Joaquín Ramos Miras ◽  
José A. Rodríguez Martín ◽  
Jaume Bech Borras
Keyword(s):  
Spatial Distribution ◽  
Rice Straw ◽  
Agricultural Soils ◽  
Simple Random Sampling ◽  
Rice Paddy ◽  
Paddy Soils ◽  
Systematic Sampling ◽  
Rice Paddies ◽  
Natural Park ◽  
Rice Paddy Soils

<p>Mercury (Hg) is a metal potentially dangerous that can accumulate in soils, move to plants and cause significant ecotoxicological risks. The province of Valencia is the third in Spain and has a great agricultural, industrial and tourist vocation; it has an area of 10,763 km<sup>2</sup>, of which it devotes 272,978 ha to cultivation, most of which are irrigated soils. To the south of the city of Valencia, is the Albufera Natural Park (ZEPA area and Ramsar wetland) with 14,806 ha dedicated to rice cultivation. Pollution and burning of rice straw in rice paddies are serious problems. Therefore, the concentration of Hg in agricultural soils in the province of Valencia according to use, with an emphasis on rice paddy soils, and spatial distribution were determined; and the effects of rice straw burning on Hg accumulation on rice paddy soils was assessed. Systematic sampling was carried out throughout the agricultural area at an intensity of a grid of 8 x 8 km, in which samples composed of soil between 0 and 20 cm were collected in a total of 98 plots; and a simple random sampling in the case of rice paddies in 35 sites, distinguishing between plots where the incineration of rice straw was carried out and where it was not. The concentration of Hg was determined with a direct DMA-80 Milestone analyzer in the previously pulverized sample. The detection limit was 1.0 g kg<sup>-1</sup>, the recovery was 95.1% to 101.0% ± 4.0%. The analyses were performed in triplicate. A basic descriptive statistic (means, medians, deviations, and ANOVA) was performed. Samples were grouped according to land use. For geostatistic analysis and in order to obtain the map of the spatial distribution of the concentration of Hg in soils, the classical geostatistic technique was used by ordinary kriging. The concentration of Hg in the soils of the province of Valencia showed great variability. The soils of the rice paddies together with those dedicated to the cultivation of citrus and horticultural of the coastal plain, showed the highest levels of Hg, in contrast to the soils of the interior areas dedicated to dry crops (vineyards, olive, almond and fodder). Spatial analysis reflected a concentration gradient from west to east, suggesting that the Hg in the soils of the interior has a geochemical origin, while in the coast soils it is of anthropic origin. On the other hand, it was observed that the burning of rice straw increased the Hg concentration in rice paddy soils. This research is the first information on the distribution of Hg in the soils of the province of Valencia and a contribution that can help weigh the effects of open burning of rice straw on Valencian rice paddies.</p>

Spatial Distribution of Heavy Metals in Agricultural Soils of an Industry-Based Peri-Urban Area in Wuxi, China

Pedosphere ◽  
2007 ◽  
Vol 17 (1) ◽  
pp. 44-51 ◽  
Author(s):  
Yan-Feng ZHAO ◽  
Xue-Zheng SHI ◽  
Biao HUANG ◽  
Dong-Sheng YU ◽  
Hong-Jie WANG ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Spatial Distribution ◽  
Urban Area ◽  
Agricultural Soils

Spatial distribution and risk assessment of metals in agricultural soils

Geoderma ◽  
2016 ◽  
Vol 284 ◽  
pp. 113-121 ◽  
Author(s):  
Zdenka Bednářová ◽  
Jiří Kalina ◽  
Ondřej Hájek ◽  
Milan Sáňka ◽  
Klára Komprdová
Keyword(s):  
Risk Assessment ◽  
Spatial Distribution ◽  
Agricultural Soils

Study on Spatial Distribution of Soil Nutrients and Comprehensive Evaluation of Nutrients in Low Mountain-Hilly Region of Sichuan Province, China

2013 ◽  
Vol 295-298 ◽  
pp. 2544-2548
Author(s):  
Jiu Jin Xiao ◽  
Hong Xing Ma ◽  
Chuang Tai Lu
Keyword(s):  
Spatial Distribution ◽  
Agricultural Soils ◽  
Comprehensive Evaluation ◽  
Soil Nutrient ◽  
Sichuan Province ◽  
Available Phosphorus ◽  
Nutrient Distribution ◽  
Available Nitrogen ◽  
Total N ◽  
Hilly Region

It is generally accepted that to overuse fertilize can led to cause fertilize resource waste, increase agriculture production cost, reducing the quality of agricultural products, and cause agricultural non-point source pollution. Determining soil nutrient distribution is critical to identify sites which are at risk of N, P and K nutrition loading. In order to know the soil nutrition spatial distribution and to determine agricultural rational fertilization, a total of 98 soil samples from the plow layer (0-20 cm) were collected in low mountain-hilly region of Sichuan Province, China. Spatial variability and distribution of soil organic matter (SOM), total N (TN), available nitrogen (AN), available phosphorus (AP) and available potassium (AK) in agricultural soils were studied using geographic information system (GIS) software. And the analytical hierarchy process (AHP) was used to determine the weight of indexes by using quantitative analysis.

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