Comparative Limnological Studies of Barali Lake Hurda and Anasagar Lake Ajmer with Reference to Planktonic Population Dynamics

摘要

Physico-chemical study are summarized. Air temperature varied between 28°C in winter to 35°C in summer 2015-16 and between 26°C in winter to 38°C in summer 2016-17. Water temperature was observed to be highest during summer 2016-17 (27° C) and lowest during winter 2015-16 (170Q;_The overall average value of air and water temperature was 36°C and 27.3 °C respectively. A good synchronization between temperature and dissolved oxygen was seen. Temperature showed a significant inverse relationshipwith dissolved oxygen. Such an inverse relationship has also been observed in monsoon 2015-16 and 2016-17; pH fluctuated between 6.9 to 8.5. The minimum pH was recorded in monsoon 2015-16 and 2016-17 which was mainly attributed to rain water after a longdry period and maximum pH was recorded during summer 2015-16 and 2016-17. According to the study, Anasagar Lake was characterized by low levels of dissolved oxygen with average value of 7.1 mg/1. The highest oxygen valuealso observed. Dissolved oxygen shows a significant negative relation with temperature, alkalinity, total hardness, electrical conductance, nitrate, phosphate, chloride, silicate and respiration. The observed high value of dissolved oxygen in winter dueto the high-solubility at low temperature and less degradation of organic matter. During the study, the highest value of total alkalinity was in summer 2015-16 and 2016-17 (590 mg/1) and lowest value was observed in winter 2005-06 (410 mg/1). Total alkalinity shows a positive relationship with temperature, pH, total hardness, TDS, conductivity, chloride and nitrate. The average value of total hardness during the study was lowest value of 315 mg/1 in 2015-16 and 2016-17 and highest value of 375 mg/1 in 2006-07.