According to the cooperation agreement between the province and the Ministry, the work scope of the agricultural geological environment investigation project in Zhejiang Province involves three key agricultural economic zones in Zhejiang Province. Including: North Zhejiang Plain (including Hangjiahu Plain, Ningshao Plain and Changsi Plain), East Zhejiang Coastal Hilly Plain (including Huangwen Plain and Wen Rui Plain), Middle Zhejiang Hilly Basin (including Jinqu Basin, Lishui Basin and Xinchang Basin), coastal beaches (including Bates, Sanmen Bay, Taizhou Bay, Yueqing Bay and Wenzhou Bay) and coastal waters (including Wenzhou Bay). The land area is 37737km2, the coastal beach 1 028km2 and the inshore shallow sea is 4848km2 (plate I- 1).

According to the opinions of the joint meeting of the Zhejiang Provincial Government and the China Geological Survey of the Ministry of Land and Resources, on the basis of the overall design, combined with the overall goal of the project and the needs of economic and social development in Zhejiang Province, after repeated argumentation and analysis, the 16 work project was determined. Among them, there are 3 basic investigation projects, 6 special research projects and 7 demonstration projects (table 1-2).

1. Basic investigation project

(1) Multi-objective regional geochemical survey

It is a comprehensive survey with wide coverage, strong systematicness and many goals. The investigation media include surface soil, deep soil (soil-forming parent material), coastal beach sediments, nearshore shallow sea sediments (water depth less than 10m) and shallow groundwater. The analysis and test items include inorganic and organic parts.

Table 1-2 Structure Table of Agricultural Geological Environment Investigation Projects in Zhejiang Province

sequential

(2) Investigation of agricultural geological background

Carry out soil parent rock, soil geological survey, soil mineral analysis and element ecological effectiveness research, soil geochemical evolution research, etc. , the preparation of agricultural geological background map, to provide basic background information for the comprehensive study of agricultural geological environment.

(3) Remote sensing investigation of agricultural geological environment

Using the macro, dynamic, comprehensive, fast, multi-scale and multi-time technical advantages of remote sensing, we will carry out remote sensing investigation of soil and agricultural geomorphology types, remote sensing investigation of beach resources, and construction of remote sensing investigation database of agricultural geology in Zhejiang Province.

2. Special research projects

(1) Study on Agricultural Geological Environment and Agricultural Products Safety

According to the present situation of agricultural products production in Zhejiang Province, four categories of agricultural products, such as rice, tea, vegetables and fruits, were selected as the research objects, the safety status of agricultural products in main agricultural products producing areas was investigated, the influence of geological environment on agricultural products safety was studied, and the agricultural products safety consultation, evaluation and auxiliary decision-making system was established.

1) Grain and oil: Focus on rape and early rice in Jiaxing City of Hangjiahu Plain in northern Zhejiang and Jinhua City of Jinqu Basin.

2) Tea: Focus on different varieties of tea in Anji, Xinchang, Hua Kai, Taishun, Jiande, Lin 'an, Lanxi, Pujiang, Dongyang, Yiwu, Wuyi and Pan 'an.

3) Vegetables: focus on suburban vegetable areas, coastal beach vegetable producing areas and alpine vegetable production bases in Hangzhou, Ningbo and Jiaxing.

4) Fruits: The focus is on Huangyan and Linhai Citrus, Qujiang Ponkan, Changshan Huyou, Yuhuan Wendan, Cixi Yangmei and Pear, Xiuzhou Pear and Jin Dong Grape.

(2) Non-point source pollution assessment and control countermeasures of agricultural geological environment.

Taking northern Zhejiang plain, eastern Zhejiang coastal hilly plain and central Zhejiang hilly basin as the key research areas, this paper studies the generation of agricultural non-point source pollution and its influence on agricultural geological environment, studies the migration and enrichment law of chemical pollutants in different media environments, transformation conditions and their influence on soil structure and function, and establishes agricultural non-point source pollution prediction model and agricultural geological environment safety early warning system.

(3) Research on agricultural geological environment and agricultural development.

Based on the investigation of agricultural resources and environment, this paper studies the advantages, disadvantages and potential of agricultural resources distribution and agricultural natural conditions, studies the main obstacles affecting and restricting agricultural production, and puts forward suggestions on agricultural layout and measures for the development, utilization and protection of agricultural natural resources.

(4) Study on site geological background of characteristic agricultural products.

The site geological background of famous tea, bamboo shoots, huyou, Sijiyou, Wendan, Citrus, Torreya grandis and Ginkgo in Zhejiang Province was studied, and the suitability and restrictive conditions of famous and special agricultural products were studied. The suitable geological environment model of famous and special agricultural products was established, and suggestions on suitable zoning were put forward, which provided scientific basis for developing famous and special agricultural products according to local conditions.

(5) Research on methods and techniques of agricultural geological environment investigation and evaluation.

By summarizing and studying the main methods, means and technologies of agricultural geological environment investigation, the technical system of regional agricultural geological investigation methods is established, and the interdisciplinary comprehensive evaluation method system is studied to improve the evaluation level of agricultural geological environment and provide technical support for comprehensive research and evaluation of agricultural geological environment.

(6) Construction of agricultural geological environment information system

Use modern computer technology, 3S technology, network technology, multimedia technology, etc. Establish a sub-database of agricultural geological environment investigation; Based on the basic geographic database and agricultural geological environment database, a set of agricultural geological environment management information system suitable for the effective management of agricultural geological environment resources in Zhejiang Province is developed to realize the collection, storage, processing, use, dynamic update, statistical analysis and auxiliary decision-making of agricultural geological environment-related information.

3. Investigation project in demonstration area

Investigation of agricultural geological environment in demonstration area On the basis of regional geochemical investigation, some representative cities and counties are selected to further study the water, soil and biological environment closely related to agricultural production and evaluate the suitability of agricultural ecological environment and geological environment for local agricultural development. Suggestions are put forward for protecting local agricultural geological environment, adjusting agricultural structure and developing benefit agriculture, providing basis for government's scientific decision-making and quickly realizing the transformation of agricultural geological survey results. According to the present situation and representativeness of agricultural development in relevant counties and cities in Zhejiang Province, after research with relevant departments, seven counties (cities) including Xiaoshan District of Hangzhou, Changxing County of Huzhou City, pinghu city of Jiaxing City, Cixi City of Ningbo City, Ruian City of Wenzhou City, Longyou County of Quzhou City and Shangyu City of Shaoxing City were selected as agricultural geological environment investigation demonstration areas in the whole province.

(ii) Project implementation

Since the agricultural geological environment investigation project in Zhejiang Province was officially launched in March 2002, all the work involved in the project has been carried out in an all-round way according to the working ideas determined by the overall design, and the research work of each sub-project was initially completed in May 2005. The project work is roughly divided into the following stages.

1. Project demonstration and design preparation

The Zhejiang Provincial Department of Land and Resources and China Geological Survey jointly established the Feasibility Study Group of Agricultural Geological Environment Investigation in Zhejiang Province in February 20001+65438. The feasibility of the project was investigated in depth, and the opinions and suggestions of leaders and experts from relevant departments inside and outside the province were widely listened to. In February, 2002, the Feasibility Study Report of Agricultural Geological Environment Investigation in Zhejiang Province, organized by Zhejiang Joint Conference, passed the examination.

On March 4, 2002, the People's Government of Zhejiang Province and the Ministry of Land and Resources signed an agreement in Beijing to jointly carry out the agricultural geological environment investigation project, and determined the Zhejiang Geological Survey Institute as the project responsible unit to organize the project implementation.

In April, 2002, entrusted by the Ministry of Land and Resources and the People's Government of Zhejiang Province, China Geological Survey and Zhejiang Provincial Department of Land and Resources jointly organized relevant experts to review and pass the Overall Design of Agricultural Geological Environment Survey in Zhejiang Province and the Design of Multi-objective Regional Geochemical Survey submitted by Zhejiang Geological Survey Institute.

2. Field investigation work

Field investigation is the most important and basic work in agricultural geological environment investigation. The outstanding characteristics of field investigation are heavy physical workload and tight time. After the overall design of the project was completed, a field survey was conducted for each subproject.

1) From April 2002 to June 2003, the field sampling work of multi-objective geochemical survey in northern Zhejiang, eastern coastal Zhejiang and central Zhejiang was completed successively;

2) From June, 2003 to June, 2004, marine sediments were sampled in the coastal shallow sea area of eastern Zhejiang.

3) From August 2003 to August 2004, the field investigation, profile measurement and sample collection of agricultural geological background were completed;

4) In 2003 ~ 2004, the field investigation and sample collection of five major agricultural products producing areas in 24 counties (cities) in the province were completed, the agricultural and rural development status, agricultural industrial structure and layout survey of nearly 400 townships (towns) in 7 cities in the province were completed, and the field verification of some polluted areas and geochemical abnormal areas and the field investigation of geological background of main characteristic agricultural products sites were carried out;

5) In 2002-2004, the comprehensive field geological survey of agricultural geological environment was completed in seven demonstration areas, including Xiaoshan, Changxing, Pinghu, Cixi, Rui 'an, Shangyu and Longyou, covering an area of 8596km2.

3. Analysis and testing work

In July, 2002, the joint leading group of the project determined the analysis center of the Institute of Geophysical and Geochemical Exploration of Chinese Academy of Geological Sciences, the Anhui Institute of Geological Experiment and the Zhejiang Environmental Monitoring Center through national bidding, which respectively undertook the regional earth of soil total elements (53 items) and pH value, available and extractable contents of soil elements (65,438+03 items), and residual organochlorine pesticides and polychlorinated biphenyls (65,433 items and components).

Zhejiang Institute of Geology and Mineral Resources, Agricultural Products Monitoring Center of Zhejiang Academy of Agricultural Sciences, Isotope Laboratory of Hubei Yichang Institute of Geology and Mineral Resources, China Rice Research Institute and Peking University Geological Laboratory also undertook the analysis and testing of shallow groundwater, agricultural products, soil minerals and other samples. These high-quality massive data have long-term application value of multi-department, multi-discipline and multi-field.

4. Comprehensive research work

In April 2005, it was transferred to the stage of summary research and results compilation of the comprehensive results of the project. On the basis of systematically collecting the preliminary research results of agriculture, environmental protection, land resources and other departments in Zhejiang Province, and investigating the research status and progress of agricultural geology, non-point source pollution and agricultural environmental protection at home and abroad, comprehensive research work has been carried out in the fields of agricultural eco-geological mapping and soil geological classification, modeling of geological environment suitable for famous agricultural products, temporal and spatial evolution of soil elements, and evaluation of soil environmental quality. The safety status of agricultural products, the migration mechanism of heavy metals in soil-plant system, the geochemical map of plant elements, the application of isotope tracing technology of pollution elements, the evaluation method system of agricultural geological environment, the comprehensive agricultural zoning, the multi-parameter comprehensive geochemical mapping method, the spatial analysis technology of information system and the application of three-dimensional display technology have achieved different degrees of results.