Study On Soil Quality Of Pollution-free Vegetable Bases In Harbin Suburb

Harbin city is countrywide key commodity grain base, agriculture to the richquality rice, soybean, corn and other known, access to pollution-free, green andorganic food cultivates an area to achieve1190000hectare. The urban area of4272square kilometers, total population9748400, among them urban population3989600.This work selects the Harbin suburb of two typical vegetable base for investigation,thorough investigation and study in the Songnen Plain of China Southern Region"special" products suitable growth environment and the quality of agriculturalproducts.This paper is on the multi-target geochemical survey data obtained on the basisof the evaluation, by use of surface and deep soil geochemical survey methodscombined, from element to element supergene geochemistry theory as a guide, to thesoil as the center, to elements in the air-water-soil-organisms circular migration asthe main line, on the basis of material in the ecological cycle rule, system acquisitionin surface soil samples, soil, irrigation water, vegetables and root soil samples, thesystem evaluates the vegetable base supergene environment, heavy metal elements asemphases, to establish the system of abnormal tracking, migration pathway research,ecological effect evaluation.Specific content includes:1, tracking of poisonous and harmful elements andbeneficial nutrition elements and the source of the chemical compounds, to focus onidentifying the local geological background and supergene geochemical effects induced by a wide range of strong, influence, abnormal abnormal element source;2,research of poisonous and harmful elements and beneficial nutrition elements andcompounds in soil, water and in biological systems, the migration pathways ofinfluence factors;3, elements and compounds appraisal of anomaly, anomalouselements and compounds distribution and the geochemical behavior of vegetablesafety effect.Technical route for:1, focus on the surface soil in the distribution of eachelement, determine the surface soil of each element in the region of anomalies of theupper limit, through the calculation of enrichment factor, draw all the elements in theworking zone of enrichment, enrichment coefficient greater than1are enriched, theconverse is not enrichment;2, in the longitudinal profile of0-200cm each20cm takesa soil sample, thus beneficial, harmful elements in the observation of soil layerdistribution;3, on the basis of Ministry of agriculture in2001awarded the nationalpollution-free vegetable production standards, work on soil fertility, soil and irrigationwater quality evaluation;4comprehensive study of vegetables and root and soil.The study showed two survey area irrigation water with pollution-free vegetableproduction safety standards, in the surface soil As, Pb, Cr, Zn, Ni elements belong to aclass of natural background value range, while the two survey of surface soil inrespectively3.1%and4.5%samples of Cd elements beyond pollution-free safetystandards. Vegetable samples in3.3%vegetables Cd content exceed the standard,2.1%vegetables F exceed the standard,0.8%vegetables Cr exceed the standard,0.4%vegetables Pb exceed the standard.