 |
 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Quantity and Distribution of Plant Nutrients on Eutrophication in Bang Pra Reservoir, Chonburi Province) ผู้เขียน: ดร.รัฐชา ชัยชนะ, รองศาสตราจารย์ ,  Chumlong Arunlertaree, Boonsong Srichareondham, ดร.ณรงค์ วีระไวทยะ, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe main objectives of this study were to study the quantity and variation of plant nutrients in water bodies supplied to Bang Pra reservoir including the characteristics of distribution and variation of plant nutrients and phytoplankton in Bang Pra reservoir. This study was conducted during March 2001 – February 2002. In the inflowing brooks, the quantity of nitrite and total ammonia were significantly different (p<0.01) both in each brook and in each month. It was demonstrated that the quantity of nitrate and orthophosphate were significantly different (p<0.01) in each month but not different in each brook (p>0.05). In Bang Pra reservoir, the quantity of nitrite in each water sample was different (p<0.05) and the quantity of total ammonia was significantly different (p<0.01). When considering both quantity of nitrite and total ammonia in each month, it was shown that they were significantly different (p<0.01). Statistical analysis indicated the significant difference of othophosphate quantity (p<0.01) in each month but not in each water sample station (p>0.05). Given these conditions, Bang Pra reservoir can be classified as a eutrophic lake. High quantity of plant nutrients in Bang Pra reservoir was mainly found at water sample stations of water receiving areas located at the mouth of brooks. The biological analysis revealed that phytoplankton, which was mostly found in Bang Pra reservoir was Aulacoseira, in Division Chromophyta. Moreover, in June, November 2001, and January 2002, Aulacoseira was found in such large quantity compared to other months that these periods could be regarded as periods of phytoplankton bloom. |
 ที่มา:KASETSART UNIVERSITY FISHERIES RESEARCH BULLETINหัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Ecosystems in Sirinthorn and Nam Ngum Reservoirs; A comparison) ผู้เขียน:ทวนทอง จุฑาเกตุ, Jacques Moreau, Boonsong Srichareondham, MalasriKumsri สื่อสิ่งพิมพ์:pdf AbstractTrophic models were constructed for Sirinthorn Reservoir (Thailand) and Nam Ngum Reservoir (Lao PDR), using ECOPATH software to understand their ecosystems. The models reveal that the trophic structure of the reservoirs is similar. Results show that the ecosystems in both lakes are sustained and considered as productive reservoirs. The transfer efficiency is between 10 and 15 % at all levels, indicating an intact food web. In both reservoirs, total fish productions can support fishing activities. There are also presented the (1) energy flow in each trophic level, (2) mixed trophic impact, in term of predator-prey relationship and fishery and (3) calculate the net biomass and production of the groups of organisms. The fishery operates at a trophic level around three, meaning that mainly zoophagous fishes are targeted. |
|