Dissertation > Excellent graduate degree dissertation topics show

Studies on the Water Eco-physiology of the Main Aforestation Trees in Maowusu Sandland

Author: DingXiaoGang
Tutor: LiJiYue
School: Beijing Forestry University
Course: Forest cultivation
Keywords: Mu Us Sandland gas Climate factors Gas exchange Foliage water potential Soil moisture content
CLC: S718.4
Type: Master's thesis
Year: 2005
Downloads: 186
Quote: 4
Read: Download Dissertation

Abstract


Mu Us Sandland typical Saudi semi-arid regions in China, the region drought-resistant tree species selection and Silviculture Technique is an important research topic in the semi-arid areas of forestry development. This paper studies the Mu Us Sandland pine and Chinese pine plantation growth relations with Saudi climatic factors, and analysis of Pinus tabulaeformis and Pinus sylvestris Plantation moisture dynamics and gas exchange characteristics and Salix Salix Salix matsudana and sea buckthorn mixed forest moisture dynamics and gas exchange characteristics, aimed at China's arid and semi-arid areas of vegetation construction and rehabilitation of drought-resistant water-saving species selection, improve the survival rate of afforestation and woodland water balance based on the forest to create provide a theoretical basis. Mu Us Sandland affect the Pinus sylvestris high growth main climate factors: precipitation in the previous year, ≥ 10 ℃ accumulated temperature and annual evaporation; major climatic factors affecting the Pinus tabulaeformis high growth precipitation in the previous year and then rainfall . Moisture factor (such as rainfall) plays an important role in the growth of two species of trees. Growth performance under drought conditions still suffer drought stress resilience, Pinus sylvestris was stronger in P. tabulaeformis. Growing season of Pinus sylvestris net photosynthetic rate maximum and average values ??are greater than the Chinese pine, Pinus sylvestris water use efficiency is always higher than P. tabulaeformis, the growing season Pinus sylvestris and Pinus tabulaeformis the daily average of water use efficiency were 3.62umolCO 2 . mmol 1 H 2 O and 3.33umolCO 2 mmol 1 H 2 < / sub> O. Pinus sylvestris net photosynthetic rate by photosynthetically active radiation PAR, stomatal conductance (Gs) and intercellular CO 2 concentration Ci impact, the main factor is to limit the of P. tabulaeformis net photosynthetic rate of photosynthetically active radiation (PAR) and stomatal conductance Gs. From the entire growing season (4 months), Salix Salix Salix matsudana and sea buckthorn June, July and August, the maximum net photosynthetic rate and transpiration rate and the average should be higher than in May, four species in descending order of net photosynthetic rate the seabuckthorn gt; Salix gt; Salix gt; S. matsudana, its value were 30.3μmol.m -2 s -1 < / sup>, 29μmol.m -2 . s -1 , 26.8μmol.m -2 . s -1 , 20.19μmol.m -2 . s -1 . Growing season transpiration rate descending order the seabuckthorn gt; Salix gt; Salix gt; S. matsudana, its value 15.4mmol.m -2 . S - 1 , 12.9mmol.m -2 . s -1 , 11mmol.m -2 . s -1 , 9.96mmol.m -2 . s -1 . Four species growing season water use efficiency curve overall downward trend in water use efficiency in descending order Salix gt; Salix gt; seabuckthorn gt; S. matsudana, respectively 2.83μmolCO 2 . mmol -1 H 2 O, 2.79μmolCO 2 . mmol -1 H 2 O, 2.70μmolCO 2 . mmol -1 H 2 O, 2.67μmolCO 2 . mmol -1 H 2 O. The most important factor is the impact of four tree species photosynthesis photosynthetically active radiation (PAR) and stomatal conductance Gs.

Related Dissertations

  1. Effects of Climate Factors for Different Transplanting Dates on Quality and Ripe Tissue in Flue-cured Tobacco,S572
  2. Characteristics of Soil Respiration, Grain Yield and Water Use Efficiency in Crop Fields under Different Mulching Modes and Crop Conditions,S154
  3. A Method to Measure Soil Moisture Based on Terahertz Transmission TDS Spectrum,S152.7
  4. The Rapid Detection of Soil Moisture Based on Near-Infrared Spectroscopy and Machine Vision,S152.7
  5. Exogenous abscisic acid (ABA) on Na_2CO_3 of Cucumber Seedlings under physiological characteristics of,S642.2
  6. The Relationship between the Distribution of Endemic, Rare and Endangered Bird and Climatic Factors in China,Q958
  7. The Characteristic of Variation in Muscle Oxygenation in Intermittent Motion,R87
  8. Conditions of Soil Temperature and Soil Water under Different Snow Thickness and Effect on Herbage Growth in the Prairie of Eastern Inner Mongolia,S812.68
  9. Experimental Study on Pool Fire Environment in Ship Room with Ceiling Vent,U698.4
  10. Regulation of Exogenous Abscisic Acid to Photoinhibition in Maize Seedlings,S513
  11. Factors Affecting the Reproductive Success of the Crested Ibis Nipponia Nippon,Q958.1
  12. Effects of Exogenous Glutathione on Physiological and Biochemical Characteristics of Pepper Seedlings under Autotoxicity,S641.3
  13. Comparative Study of Rice Anatomical Structure and Leaves Gas Exchange Characteristics in Water Cultivation and in Dry Cultivation,S511
  14. Effects of Conservation Tillage on Saving Water and Increasing Yield in Sloping Land of Heilongjiang Western Sandy Area,S345
  15. Ecophysiology Compensatory Mechanisms of Caragana Korshinskii after Clipping,S793
  16. Research on High-Rise Buildings Layout Planning Strategies Based on Climatic Design in Harbin,TU119
  17. Effects of Light Intensity on Anthocyanins Contents and Photosynthetic Characteristics in Ocimum Basilicum L. Leaves,S636.9
  18. A Study on the Moisture Content Migration Model of Seasonal Frozen Soil,TU445
  19. Characteristics of the Gas Exchange and Growth of Tibetan Chicken Embryo Incubated at High Altitude,S831.1
  20. Oak forest succession Physiological Ecology,S718

CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Dendrology
© 2012 www.DissertationTopic.Net  Mobile