Dissertation > Excellent graduate degree dissertation topics show

Monitoring and Loading Estimation on Non-point Sources Nitrogen Pollution of Crop Production

Author: HuZuo
Tutor: XiangBao
School: Chinese Academy of Environmental Science
Course: Environmental Science
Keywords: Crop Production Non-point Sotlrces Nitrogell Pollution Morlitoringtechnologies of Non-point sources pollution Isotope Tracing Loading Estimation
CLC: X592
Type: Master's thesis
Year: 2012
Downloads: 220
Quote: 0
Read: Download Dissertation

Abstract


Non-point source nitrogen pollution of crop production monitoring technology is an important way to estimate the total amount of non-point sources nitrogen pollution and research on the mechanism and characteristics of crop production pollution. This technology is not only built through research and analysis about the process of Non-point source nitrogen pollution of crop production, but also combined the classic field investigation. Focusing on that nitrogen retarded in crop production field and dissolved non-point source nitrogen pollution in water, pollution loading estimation method were proposed and applied to the Ashi River Basin.This thesis has achieved the following results:(1) Formation processes and pollution characteristics of non-point source nitrogen pollution were analyzed, through basic data collection, summary and research, monitoring method on non-point source pollution of crop production was established. It is mainly focusing on monitor index selection, analytical method, monitor point setting method and monitor frequency. Meanwhile, non-point source pollution isotope analytic detection technology is applied in order to achieve monitoring the system:non-point source pollution origin-migration and transformation-into water.(2) We monitored basin non-point source nitrogen pollution through Ashi River Basin. According to the investigation, measuring and the formation characteristics of river runoff, we investigated the characteristic and source of basin nitrogen pollution during normal water period, rich water period and low water period, respectively. The results show that the total nitrogen concentration is higher than ammonia-nitrogen concentration in Ashi River Basin. The ammonia-nitrogen concentration kept in III level in most area except the area that affected by agricultural and industrial production.The amount of sampling point for III level ammonia-nitrogen concentration raised by the water decreasing. We obtained that upstream of river possessed better water quality and worse in middle and down stream by analyzing the general index value from Ashi River Basin source to the downstream.(3)Combined with15N isotope tracer technique, we analyzed the origin of basin nitrogen pollution. Among them, the planting of non-point source nitrogen pollution as the main sources of pollution areas are mainly distributed in the middle and lower reaches, soil organic nitrogen pollution mainly caused by artificial fertilizers and farm recession, and high correlation with the land use types. In wet period, non-point source nitrogen pollution to planting the area of the main sources of pollution more, the upper reaches of artificial fertilizers as the main sources of pollution, mainly the middle and lower reaches of erosion by rain and irrigation planting area soil and the formation of soil organic nitrogen sources. There are some areas as artificial fertilizers as the major sources of nitrogen pollution in the dry season, mainly due to the rainy season, artificial fertilizers, nitrate infiltration into the ground, when the dry season, underground runoff rivers, nitrate retention in the river caused by pollution.(4) We obtained that the TN content of topsoil possessed the highest volume after crop harvest, the content of TN during growing period of plants had less and during thesowing time it drop button, this results were received by monitoring the nitrogen content in soil of12typical planting area in Ashi River Basin during sowing time, growing period and after crop harvest, which was1.36×106t,1.37×106t and1.59×106t. The conclusion proved that nitrogen content of topsoil in Ashi River Basin is closed related to fertilization for plants.(5)According to the monitor dissolved and adsorbed nitrogen content results of typical planting area of Ashi River Basin basin and experimental site rainfall, we calculated the export coefficient of non-point source nitrogen pollution of crop production is2.96t/km2-a, then the output load was achieved by using export coefficient method:4847.26t/a, amount into river was2210.52t/a, which account for54.01%to the whole non-point source nitrogen pollution in Ashi River Basin. The middle and lower reaches of Ashi River Basin possess higher output load.

Related Dissertations

  1. The Evaluation of the Crop Production Ecological Footprint and the Crop Consumption Ecological Footprint in Jiangsu Province,F123
  2. Using Geochemical Tracer Research the Source of Metal in Geogas,P632
  3. Study on the Technique to Increase WUE of Crop on Shoaly Land in Bashang Region og Hebei Province,S318
  4. Study on Isotopes and Organic Inclusions of Fluid Flowing during the Mesozoic Tectonic Movements in Dabashan Foreland Belt,P618.13
  5. The Effect of Climate Change on Main Crops Production During the Last30Years in Jianghuai Region,S162
  6. Canopy Eco-Physiological Properties and the Influence Factors in Irrigated Rice,S511
  7. Community Structure and Secondary Production of Benthic Macroinvertebrates in a Second Order River of Changjiang River Basin,Q958.8
  8. The Action Mechanism of Cytosinpeptidemycin on Tobacco Mosaic Virus,S432.41
  9. Comparative Advantage and Structure Adjustment in China’s Crop Production,F326.1
  10. Study on Evaluation of Eco-economic Suitability and Sustainable Development Strategy for Main Crop Production in Hunan Province,S181
  11. Study on the Development of Minor Grain Crop Industry,F326.11
  12. The Production Situation and Development Stratagem of Small Group Food and Bean in China,F326.11
  13. Estimation and Evaluation of Nutrient Flow in the Staple Grain Crop Production-Consumption System in China,F326.1
  14. Lead Isotope Tracing of Major Sources of Lead Pollution in the Atmosphere of Chengdu City,X51
  15. Optimize and Simulate the Planting Mode with Resource Utilized Efficient Based on DSSAT Model,S344
  16. Crop Production Control Information System Construction Based on WebGIS,S126
  17. Preclinical Pharmacokinetics of Polyethylene Glycolylated Recombinant Human Interleukin-6 (PEG-rhIL-6),R96
  18. Behavior of Ceria Nanoparticles in Aquatic Ecosystems & Inhalation Toxicity of Ceria and Ytterbia Nanoparticles to Icr Mice,TB383.1
  19. Optimal Models of Farmland Shelterbelts on Chongming Island, Shanghai,S727.24
  20. The Evaluation of Production Development External and Potential Advantage of the Main Crops in East China,F326.1
  21. Comparative Advantage Andstrucrure Adjustment in City Laizhou’s Crop Production,F326.1

CLC: > Environmental science, safety science > Environmental pollution and its prevention > Agricultural chemicals,toxic chemicals, pollution and its prevention
© 2012 www.DissertationTopic.Net  Mobile