ผลกระทบของอุณหภูมิและแสงต่อการเจริญเติบโตและการสังเคราะห์ด้วยแสงของพืชน้ำในทะเลสาบสงขลา

Abstract

Currently theSongkhla Lake is that ecosystem changes as to changes in the environment. The climate change that may occur in the future that causes the water to have a higher temperature and the light in the water changes. The volume of light may be reduced as to the eutrophication and the increase in sediment. Which light and temperature was a significant factor in the growth and photosynthesis of macrophytes. If there is insufficient volume of light or excessive volume, the growth rate and photosynthesis of water plants will decrease. Causing macrophytesto change or disappear from now will result in the habitat of aquatic animals, source of oxygen in the lake less, the ecosystem in the Songkhla Lake has changed. In research studies 1) study the effect of high temperature and low light on growth and photosynthesis of Ceratophyllumdemersum and Elodea canadensis from Songkhla Lakein the aquarium in the laboratory for 60 days under the temperature of 30, 33 and 36 0C and the light intensity 180, 90 and 45 umol. C. demersum has photosynthesis, Organic matter, Organic carbon, chlorophyll a, chlorophyll b and chlorophyll a: b better than E. canadensis. Growth was found that C. demersum growth rate was lower than E. canadensis.2) study the effect of low light studies in Songkhla Lake By dividing the experiment into Control, 25% Shade, 50% Shade and 75% Shade. It is found that MOY and EQY are not different. The value is in the range of 0.7-0.8 but Saturating irradiance, alpha and rETRmax at 50% Shade has the lowest value in the growth rate of E. Canadensis in each experiment. Found that it can grow well at 50% Shade set, the amount of organic matter, Organic Carbon, Chlorophyll a, Chlorophyll b and Chlorophyll a: b. It was found that the light set decreased by 25% Shade. This study instruct that temperature and light an important role in photosynthesis and growth of C. demersum and E.canadensis if the high temperature and low light intensity will result in macrophytes that cannot tolerate high temperatures and the low light intensity has stress cannot synthesize light and grow affecting the fertility and distribution of this species in Songkhla Lake