Ecological Geochemical Information Of Land And Nutrient Management Tuojiang Town, Neijiang City

Recently, the land quality, the agricultural ecological environment and theagricultural products’ security issue are all seen as significant problems. Thus, on theplatform of geographic information system, combined with the geochemical,agriculture, ecological science and other multidisciplinary research method arises at thehistoric moment. In2002, Sichuan Province has been carried out ecologicalgeochemical survey and evaluation in Chengdu Economic Zone. The" Golden LandProject" area of agricultural geological survey was carried out as the core of landconsolidation. After finding out the land consolidation of ecological geological andgeochemical environment as well as the land quality status, it is gradually formed therelatively perfect land quality geochemical evaluation theory system. All theinvestigate results mentioned above, provided the basic geological and geochemicaldata and the scientific basis for the land resources and science management,agricultural planting structure adjustment and governance as well as ecologicalenvironment.This paper take Tuojiang, the town of Neijiang city, for example, investigating thegeological environment, ecological environment and geochemical environment bycombining the geological and geochemical methods and using the "3S" technology.Furthermore, the paper try to get Tuojiang town’s regional ecological geochemicalinformation in different mediums (soil and biological, water, air, etc) as well as set upthe information system. Also, it selects typical major crops and inquiries their yield andfertilizer status information for analyzing the abundant present situation of soil nutrient.Moreover, the paper provides the basic data materials for planning fertilization regionsand agricultural planting structure adjustment and is helpful for green food andpollution-free agricultural product’s optimization. All of what mentioned above haveimportant meaning to improve the land utilization, output and ecological environment. The paper uses the constructed information system as the platform and selectstypical staple crops of corn and rice, and also inquiring their yield and fertilizer statisticstatus information. Also, it articulates all kinds of sampling points’ spatial attribute andthe analysis test results. Furthermore, it selects related standards and divides them intomacroelement, secondary element, trace element and organic on the soil fertility quality,conduct single index evaluation and fertility comprehensive evaluation from differentindex. According to the evaluation results, the paper uses application space analysismodule of MapGIS software to draw grading evaluation map and soil fertility qualitycomprehensive evaluation map in each index. To evaluate crop’s quality safety, andfurther analysis and discusses the relationship between soil fertility quality, crop qualityand crop fertilizing amount, which based on GIS that puts forward concrete suggestionsof soil nutrient management in the study area.Using the technology platform, we could easily achieve soil nutrients’ realisticsituation and fertilizer demand docking in study area, and also could accumulatehistorical data material, realize long-efficiency sustainable development andmanagement trace.