Draft Report on Review Biological Assessment of Freshwater Ecosystems in Viet Nam
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Viet Nam National Mekong Committee Environmental Program Draft report on Review Biological Assessment of Freshwater Ecosystems in Viet Nam Prepared for VNMC Pham Van Mien National Expert January 2002 1 Table of content CHAPTER 1 INTRODUCTION ............................................................................................... 3 CHAPTER 2. THE INLAND WATER BODIES OF THE MEKONG RIVER BASIN IN VIETNAM ......................................................................................................... 5 a. The Dien Bien waterbody................................................................................... 5 b. The West Thua Thien – Hue water bodies ......................................................... 5 c. The Tay Nguyen highland waterbodies............................................................. 5 d. The Mekong Delta in Vietnam ........................................................................... 5 CHAPTER 3. FINDINGS AND OBSERVATIONS OF FRESHWATER ECOSYSTEM OF THE MEKONG RIVER BASIN IN VIETNAM............................................... 7 a. General................................................................................................................ 7 b. The impact of socioeconomic activities on the ecosystem of water bodies in Mekong Delta of Vietnam. ................................................................................. 7 CHAPTER 4. INVENTORY OF THE PAPERS, REPORTS ON BIOLOGICAL MORNITORING AND RESEARCH OF FRESHWATER ECOSYSTEMS OF MEKONG RIVER BASIN IN VIETNAM................................................ 12 CHAPTER 5. LIST OF GOVERNMENTAL AGENCIES AND STAFF EXPERIENCING IN BIOLOGICAL MONITORING AND ASSESSMENT ............................. 16 CHAPTER 6 BASIC CHARACTERISTICS OF THE FRESHWATER ECOSYSTEM OF THE MEKONG RIVER BASIN IN VIETNAM............................................. 17 a. Ecosystem of inland water bodies in Mekong Delta of Vietnam. .................... 17 b. Migrated phenomenon of marine originated fauna into inland cover the whole canals and rivers in Mekong Delta of Vietnam. ............................................... 18 c. Topographic structure of Mekong Delta of Vietnam, there are large wetland areas of acid sulfate soil.................................................................................... 19 d. Ecosystem of Tay Nguyen Highland water bodies. ......................................... 20 e. Ecosystem of water bodies in the West Thua Thien – Hue region................... 22 g. Eecosystem of Dien Bien water bodies. ........................................................... 23 h. The zoogeography location of these water bodies of Mekong Delta in Vietnam. 24 CHAPTER 7. REVIEW AND ASSESSMENT OF THE MRB FRESHWATER ECOSYSTEMS IN VIETNAM ....................................................................... 25 CHAPTER 8. CONCLUSIONS AND RECOMMENDATIONS.......................................... 30 2 CHAPTER 1 INTRODUCTION 1.01 According to the Contract No. PPOQ-159 by the Mekong River Commission, dated November 23rd, 2001 as well as the request from Vietnam National Mekong Committee, dated on December 5th, 2001, this report prepared by a Local Freelance Expert who have been joint the research and monitoring activities on biology for 40 years. 1.02 The main objectives of the study are to: • Review past and present research and monitoring activities in biological assessment of freshwater ecosystem in Vietnam basing on the attention to the methods, activities, resources and skills. • List data, reports as well as local experts concerning the activities on monitoring and research of freshwater in Vietnam. • Find and observe during the reviews of the specific studies on the freshwater ecosystem. The main findings focused on the fields of: + Basic characteristics in every freshwater regions of the Mekong River Basin belonging the Vietnam areas + Relation between the freshwater ecosystems in Vietnam and the neighboring regions of the Mekong River Basin through define of zoogeographic locations of those regions. + Changes of inland freshwater ecosystems of Mekong Delta in Vietnam territory caused by the social- economic development activities. 1.03 The report has been prepared based on the following methodology and approach : • To collect and inventory the documents on the restricted distribution invertebrate of the landscapes and geographic regions such as Crustacea, Decapoda, Copepoda, Calanoida, Mollusca. In fact, it is the results based the taxonomy studies by the European Experts working in Vietnam. • To Analyze, review and evaluate as well as generate the results from the documents concerned that have been prepared by the Vietnamese Experts since 1960 up to now. • Consult and compute with the Experts from line-agencies as well as the individual Experts such as Prof. Dang Ngoc Thanh of the Hanoi University, the others Experts from Hue University and Cantho University and the Natural Science University working together at the research carried out in the North Vietnam, Thuathien – Hue, Tay Nguyen, Mekong Delta of Vietnam. 3 1.04. The study has been concentrated on the freshwater ecosystem in the Mekong River Basin belonging to the Vietnam areas only. 1.05 The structure of the report includes 8 chapter in which Chapter 2 devoted to inland water bodies in Vietnam. Chapter 3 mentioned about the findings and observations. Chapter 4 inventoried the papers, reports, studies concerning the research and monitoring activities of freshwater ecosystem in Vietnam. Chapter 5 listed the Government Agencies as well as the Staff who are experienced in doing monitoring and research in biology in Vietnam. Chapter 6 presented the characteristics of the freshwater ecosystem of the Mekong River Basin in Vietnam. Chapter 7 assessed and reviewed the freshwater ecosystem in Vietnam and Chapter 8 showed the conclusions and recommendations. Besides, the Annexes and Maps also enclosed the report. 4 CHAPTER 2. THE INLAND WATER BODIES OF THE MEKONG RIVER BASIN IN VIETNAM 2.01 The inland water bodies locate in Vietnam territory belonging to the Mekong River Basin include 4 regions: Dien Bien (Lai Chau Province), A Luoi (Thua Thien – Hue Province) – The Side of West Truong Son, Tay Nguyen Highland and the Mekong Delta of Vietnam. The Dien Bien waterbody 2.02 The water bodies of Dien Bien belong to the Mekong River Basin consist of Nam Rom River, tributaries, reservoirs, fish ponds and rice fields. In the history of Dien Bien formation, it have not yet appeared the water bodies of national lake form, but after 1960, reservoirs have constructed. 2.03 Geographic locations of the water bodies located in the West North regions and the North Central of Vietnam, which belong to the Northern climate region – The West North climate region with the specific characteristics of winter season character red by less cold and dried whole the season; summer season very hot and coming early; a little rain. In Dien Bien, the yearly average rainfall is around 1,567 mm. b. The West Thua Thien – Hue water bodies 2.04 The water bodies in the West Thua Thien – Hue region located in the watershed between the West Truong Son and the East Truong Son include rivers, streams flow Xe Bang Hien River, which discharges into the middle Mekong River in Lao. For that reason, the running water is the basic characteristic of water bodies in this area. In A Luoi (Thua Thien Hue), many aquaculture ponds have been dug by the local people. 2.05 Geographic location: These water bodies in the West North and the North Central of Vietnam, belong to the climate region of the East Truong Son – Binh Tri Thien with the basic characteristics are the strong weather varies with the cold and humid winter season; the summer is hot, dried and much rain. The rainy season begin and finish lately, the rainfall occurs the concentration in two months of October and November. c. The Tay Nguyen highland waterbodies 2.06 The Tay Nguyen plateau is mountain areas and plateaus in the West side of Truong Son range, it belongs to the geographic region of the South Central and the South of Vietnam. 2.07 The Tay Nguyen plateau belongs to the climate region of the South Vietnam – The Tay Nguyen climate region with the specific characteristics of temperature regime very temperate: the soft sunlight summer, the cold winter but not too cold as the mountain areas of the North Vietnam. The yearly average rainfall is so high from 1,852 to 2,447 mm. The dry season is blazing hot and length. 2.08 The water bodies in this region include rivers as Po Co, Sa Thay, Sre Pok, Ia Leo. Lakes are originated from volcano (Bien Ho – Pleiku), river (Lac lake – Dak Lak), and other reservoirs such as Dak Uy, Ialy have built in recently years,…. d. The Mekong Delta in Vietnam 2.09 The Mekong Delta of Vietnam includes two major branches that are the Mekong (Tien) and Bassac (Hau) of Mekong River, tributaries and the interacting canal network connecting with Vaico and Dong Nai river systems. In the formation history, according some 5 specialists said that, the Vaico River was a branch of Mekong River, but in the tectonics process, it was separated to the Mekong river system and joined with the Dong Nai river system. 2.10 No natural lakes and large reservoirs appeared in the Mekong Delta of Vietnam that the water bodies include such as ponds, rice fields, the shallow wet land areas with a lot of aquatic macrophyte. 2.11 Geographic features of the water bodies of Mekong Delta in Vietnam which belong to the climate region of the South Central and South of Vietnam