Appraisal Of Geochemistry Of Land Quality Of Putting In Order Area Of Land Of Pengshan County

Land is the most basic resources for human survival, with the rapid growth of the world's population, can reduce the use of land resources and degradation, and the contradiction between supply and demand have become increasingly prominent, the quality of the land issue has become public by governments and the focus of attention . The quality of the land to a direct impact on agriculture, forestry, animal husbandry production efficiency and quality of life. Land quality assessment is a comprehensive measure of the level of land quality, land quality differences show an effective way to investigate the agricultural land resources, an important aspect of overall planning and land an important part of it is to carry out the evaluation of other land to work in national economic construction have great significance.The thesis relies on the agricultural geological survey project-the land consolidation zone in FengmingTown Pengxizhen Xiejiazhenof Pengshan County, used basic theory and method of agricultural geochemistry, environmental geochemistry , analysis by investigating the impact of land quality and constraints of the natural characteristics of , useful in the study area to identify toxic elements and spatial distribution of elements on the basis of the evaluation of the soil, water, crop status quo of environmental quality; and GIS technology in support of the useful elements of the basis of the land, the distribution of toxic elements soil environmental quality assessment, safety evaluation of combination of crops and water, the results of environmental assessment, land quality classification, gradation, through comparative study, the initial elements revealed in the soil, water and organisms in the migration, transformation, accumulation of laws and mechanism of recourse elements (indicators) causes abnormal and ecological effects.The research findings show:Heavy metals Elements Cd, Hg, As and Mn have different spatial distribution in surface soil, Its coefficient of variation were 0.294,0.264,0.204,0.304; A large number of nutrient elementsN,P,K and As,Cd,Cr,Hg,Mn have the tendency to collect in the soil of top layer richly, Its average content is greater than or equal to background value; The nutrient index is demonstrated in this district to the west in the east the form of the ladder is distributed from Xing Chong village - Lingjiao Village - Hongshi village,ZengPai village, Cu,Zn,Mo,Mn,N,P,K,Org Content in the soil increase progressively to in the east west, B content of reduced.In Vertical profile, A large number of nutrient elements N,P,K and useful trace elements and some heavy metal elements(Cd,Pb)Were higher than the surface show the characteristics of deep content, that indicate the content of the element is influenced by human activity, living beings and climate in the soil of top layer.It totally accords with the water standard requirement of field irrigation, suitable field irrigation to irrigate water quality; The content of heavy metal and space distribution characteristic reveal in nearly atmospheric dust of the earth's surface, two main traffic highway both sides nearly the earth's surface atmospheric dust serious metallic element it appears to be relatively high value district, the traffic has already exerted an influence on urban air quality, this should cause the attention.The soil environmental quality of top layer of studying area is better overall, Among them first class soil area is 31.48 hectares, accounts for 3.84% of the whole area, Second soil area is 575.38 hectares, accounts for 70.22% of the whole area, tertiary soil area is 204.47 hectares, accounts for 24.95% of the whole area.Based on production capacity of investigating area land crops, count the characteristic according to the regional element of space distribution of the crops output, have set up the hierarchical evaluation criterion of soil nutrient of this area. Soil nutrient comprehensive appraisal result showed that study district soil nutrient index content overall better, Among them the soil area of the abundant rank is 353.11 hectares, accounts for 43.11% of the whole area, Mainly distributed in the north of Hongshi villag, the west of ZengPai village,LingJiao village and XingChong village, The area of the general rank is 351.04 hectares, accounts for 42.85% of the whole area, Lacking the area only has 115.04 hectares, accounts for 14.04% of the whole area, mainly distributed on both sidesof ChengLe high speed.The quality evaluation of comprehensive land reveals, The land quality of studying area, is mainly by 212 and 312 , Accounts for 45.61% and 22.38% of the whole area separately, Soil fertility is abundant,Land quality is good overall。...