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Study on Pollutant Characteristic of Agricultural Non-point Source Pollution in Soil of Typical Area in Guizhou Province

Author: LinShaoXia
Tutor: LinChangHuï¼›HeTengBing
School: Guizhou University
Course: Environmental Science
Keywords: Agricultural non- point source pollution Soil pollution Nitrogen Phosphorus Heavy metal Regional characteristics
CLC: X53
Type: Master's thesis
Year: 2009
Downloads: 72
Quote: 0
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Improper administering of agricultural materials for the agricultural production process of Guizhou Province, the environment generated by a significant negative impact on the problem. Agricultural production representative area of ??Guizhou soil as a research subject, through general survey, the current research on agricultural non-point source pollution in Guizhou Province. At the same time take the typical regional distribution sampling method to detect the agricultural environment and forest land, dry land, paddy fields, vegetable plots several types of soil environmental quality and the characteristics of the comparative analysis of the accumulation of pollutants in agricultural soils. Occurrence Characteristics of agricultural production, environmental contaminants in the soil environment, as well as agricultural production, agricultural supplies unreasonable use of the soil environment harmful levels, summed up the research main conclusions are as follows: (1) agricultural non-point Guizhou source pollution, the survey found that: With the increasing development of the rural population, rural livestock farming, the amount of pollutants generated in rural areas is increasing year by year. On the other hand, while increasing agricultural materials, agricultural production and cultivated area has reduced year by year, gradually increasing the amount of pollutant load per unit area of ??arable land, the degree of contamination of agricultural land gradually. (2) Guizhou supplies of agricultural production inputs relative to the national average, smaller. However, the agricultural production environment in the special karst conditions, even small inputs of pollutants is also easy to agricultural soil environment hazards. (3) agricultural soils affected by long-term human impact of production activities, the basic nature of the soil changes, mainly as follows: lower soil pH, sand content increases from the water held on Fertilizer fine silt content decreased. The soil agricultural non-point source pollutants in the different regions of Guizhou exhibit different characteristics, mainly as follows: the southern and central regions of soil non-point source contaminants, low in the eastern and northern regions. (4) due to the different ways of agricultural land use, soil by exogenous inputs in the production of agricultural satisfied the amount and types of materials, the occurrence of contaminants in the soil types is mixed. The study showed that: in the same area, the total nitrogen content in cultivated soils of paddy fields gt; vegetable plot gt; arid; alkaline hydrolysis nitrogen vegetable plot gt; paddy fields gt; arid; the total phosphorus vegetable gt; dryland gt; paddy fields; available phosphorus vegetables to gt; dryland gt; paddy fields. The pollution mainly for heavy metals in soil pollution of Cd, Hg, Cd accumulated in the soil of the amount of paddy fields gt; vegetable plot gt; drylands; Pb accumulation in dryland gt; paddy fields gt; vegetable. (5) Due to the different cropping patterns of arable land, as well as the differences of different crop nutrient demand, but also there are differences between the different cropping patterns caused by soil non-point source pollutants. Mainly as follows: the high dryland soil nitrogen and phosphorus accumulation in rape / corn, vegetable / corn cropping patterns, followed by the single-season cropping patterns, heavy metals accumulated amount of high vegetable / corn, wheat / corn cropping patterns, paddy fields nitrogen and phosphorus in the soil accumulated higher than single cropping of rice planting two crops a year mode, heavy metal accumulation in the single cropping of rice planting higher modes soil. (6) soil by agricultural non-point source pollution from the relationship between the degree of the settlements performance: when the distance lt; 100m gt; 1000m when the extent of soil contamination is more serious; When the distance is 100m ~ 1000m between When the extent of soil contamination with increasing distance from the moderating trend. (7) the content of the regional soil agricultural non-point source pollutants and to the level of fertilizer nitrogen content increased with increasing the amount of nitrogen fertilizer, the phosphorus content in tandem with the amount of phosphorus fertilizer increase, and vice versa .

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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