Study On Farmland Ecological Security Early-Warning

Currently our country main agricultural products have already changed from insufficient of quantity to less high quality,because of serious agriculture environmental pollution and food quality security problem.Advancing of people life and our country having added WTO,and then global economy integration step being accelerated,agricultural products with pollution free and nutrition and high quality is very important and have already become reflecting the important index that agricultural product marketplace competitiveness and intemational market admittance.Our country has attached much importance to agricultural product safety.Since 2001,Ministry of Agriculture has carried out the Action Plan of Pollution Free Food in the whole country.The country has promulgated agricultural products quality security standards in 2006.,and then carry out agricultural products producing area manages.Proceeding with place of production and marketplaces,carry out'from farmland to dining-table' complete process control of quality security of agriculture products.Cleansing the environment of producing area and keeping food quality safety from origin are one of measure to pushing forward and agricultural producing area safety monitors and assessing and developing trend annual reports are stipulated.To guarantee agricultural products safe,the producing area and farmland ecological security early-warning is especially necessary.Basing on appraising and forecasting,farmland ecological security early-warning can give an alarm of converse successin,degeneration and exasperate of farmland environment and ecosystem in time.That has the preceding function of foresee and wake the tend,direction speed and sequential of farmland.Study on farmland ecological security early-warning can offer science bases to the choices and manage of Organic Food,Green Food and Pollution-Free Agriculture Products producing area.Using for reference of theories and practices of early warning,eco-environment early warning and early-warning in other domains at home and abroad,combined farmland ecosystem process characteristic analysis,this paper discussed farmland ecological security early-warning theory and technology.The indexes,forecast models,discriminant mathematical expressions of farmland ecological security early-warning were studied,and the early-warning system based on advanced WebGIS was designed.Then farmland in He Fei Jiang Huai watershed area was taken as an example to demonstrate.This is a good explore farmland ecological security early-warning.(1)The process of farmland ecological security early-warning is definitude alert circses,search alert fountainheads,analyze alert,omens predict alarm degree and eliminate alert.The methods have black measure,yellow measure,red measure,green measure,and white measure.The early-warning styles have badness state early-warning,deteriorate tend early-warning,deteriorate speed early-warning, critical early-warning and catastrophe early-warning in connotation,or break out early-warning,short-term early-warning,medium and long-range warning in time scale,or national,area,province,county,small area early-warning in space scale,or genes,subsystems,large-scale system early-warning in hierarchical structure.(2)The issues farmland ecosystem faced with at present were analyzed,then the indexes system was established.The early-warning degrees of indexes were quantificationally divided basing on the correlative standards in environment and agriculture fields and so on.The forecast models about farmland were analyzed and compared,and compatible quantitative models were established basing on those. Basing on the ecological early warning existing researches,the mathematical expressions of badness state early-warning,deteriorate tend early-warning,deteriorate speed early-warning and critical early-warning were established.Different access authority users could browse and query early-warning information and operate the maps and so on.(3)The farmland ecological security early-warning system based on advanced WebGIS was designed and integrated using B/S structure.The security status, evolvement tend,deteriorate speed in certain space and time of the farmland fertility, acidigication,salification,water and soil loss,desertification,metal pollution, pesticide residue and the whole in kinds of circumstance and artificial action influence can be to visual and quantitative forecast and early warning.(4)The farmland in He Fei Jiang Huai watershed area was taken as an example to demonstrate.The security of farmland ecosystem in this area was general analyzed, the alert critics were definitude.Basing on the early-warning system,the farmland ecological security status,develop tend and speed were early warned and partition. And the suggestions of eliminating alarm were advised...