Dissertation > Excellent graduate degree dissertation topics show

Sandy area along the Great Wall in Yulin sand-fixing forest structure and effectiveness studies

Author: GaoChengXiong
Tutor: ZhuShouJun
School: Northwest University of Science and Technology
Course: Utilization of Agricultural Resources
Keywords: Windbreak and sand fixation Structure Eco-efficiency Mu Us Sandland
CLC: S727.23
Type: Master's thesis
Year: 2008
Downloads: 100
Quote: 0
Read: Download Dissertation


Landscape ecology , systems engineering and sustainable development theory, through the investigation of regional standards combined with the location test , the individual technologies and comprehensive combination of technical measures , positioning comparative observational and experimental analysis of the combination , the application of mathematical analysis and computer technology , the system studied along the Great Wall in northern Shaanxi Yulin Desert sand-fixing structural configuration and its ecological benefits, proposed to adapt to different site types of shelterbelts and optimized allocation of reasonable structure type model for scientific guidance for anti-desertification projects smooth implementation provides a theoretical basis and technical support , the regional ecological environment has an important and realistic significance. Main conclusions are: ( 1 ) site conditions Yulin area can be divided into an area with three Category 5 16 kinds of types of site conditions , site conditions suitable for the growth of large-scale afforestation and can be planted bushes and grass plants are mainly camphor Son Song, co- Young , flower sticks , riding Lang, Amorpha , Caragana , Salix , sea buckthorn , Artemisia , adsurgens more than 10 species . ( 2 ) District Yulin sand-fixing forest planting density should be controlled at a reasonable 3000 ~ 3500 cluster / hm ~ 2 is appropriate, the forest cover was maintained at about 0.33 to 0.55 . Windbreak and sand fixation structure type shrubs and grasses mixed type should be used to build three-dimensional protective structure , you can get better protection benefits. ( 3 ) fixing forest shrubs Yulin area has a significant eco-efficiency can reduce wind speed and reduce the sediment load , increase soil organic matter, total nitrogen, available phosphorus and other nutrients, thus improving the local environment is important.

Related Dissertations

  1. Synthesis, Structure and Properties of PBO/SWNT Composite Fibres,TQ340.64
  2. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  3. Research on the Mainframe System of Powder Mixed EDM and the Craft Experiment,TG661
  4. Investigations of Structure and Glass Forming Abilty of Amorphous Alloys,TG139.8
  5. Technology of Filling Clearance and Optimizing the Bonds during Ultrasonic Brazing,TG454
  6. Research on the Structure and Characteristics of Permanent Magnetic Coupling,TH139
  7. Finite Element Analysis and Structure Optimal Design for Combined Seal at Normal Temperature and Low Temperature,TH136
  8. The Study on Structural Calculation and Analysis Method of Lattice-type Crane with Variable Cross-section Boom,TH21
  9. Based on Nonliner Finite Element Analysis of the Infilled Wall Frame Structure,TU323.5
  10. Influence of over Fired Air on Gas-Solid Flows in a W-Shaped Flame Boiler,TK229
  11. Simulation Research on Compound-Structure Permanent-Magnet Synchronous Machine System Used in Hybrid Electric Vehicles,TM341
  12. Research on an Axial/Radial-Axial Flux Compound-Structure Permanent-Magnet Synchronous Machine Used for Hybrid Electric Vehicle,TM341
  13. Hong'an dialect syntax research,H146
  14. Adjust the structure of higher education in Yunnan Strategy Study,G649.2
  15. Research on Stability of Hierarchical Sattellite Network,TN927.23
  16. Research on Autamatic Music Structrue Analysis,TN912.3
  17. Research and Design of High Layer Protocol in DMR Trunking System,TN929.52
  18. Research on Structure Transition Technology for SMT,TP391.2
  19. Research on Attitude Control Law of Endo-Atmospheric Missile,TJ765.23
  20. Study on Nonlinear Variable Structure Guidance Law,TJ765
  21. Sliding Mode Variable Tructure Control for Separating-Mirror System and Inhibit Chattering,TP273

CLC: > Agricultural Sciences > Forestry > Silviculture, tree breeding and afforestation techniques > Tree species, various types of special areas of afforestation > Shelterbelts > Sandbreak Forest
© 2012 www.DissertationTopic.Net  Mobile