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ESS Assess lab

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MODEL ASSESS LAB 3 Name - Siddhant Nahta Subject - ESS SL2 GR no. - 302 Date -11th October 2008 Environmental Conditions & Location Site: Kaneri Caves , Sanjay Gandhi National Park , Mumbai Time: 8.00 am to 1.00 pm Temperature: At Foothill: Soil temperature is 27.9�C. Air temperature is 31.4�C. Adjacent to the pond: Soil temperature is 27.8�C. (mid altitude) Air temperature is 33.5�C. 1) SOIL TEXTURE Aim : Physiochemical evaluation of soil at different altitudes of the Kaneri Caves at Sanjay Gandhi National Park , Borivali , Mumbai. Data Collection : The following are the details of the soil at a particular location subdivided into foothill and pond habitat. At Foothill: Initial Weight of Soil: 10g Dry Weight of Soil : 8.639g At habitat adjacent to the pond (mid altitude) : Initial Weight of Soil : 10g Dry Weight of Soil : 7.548g Data Processing : The data processing was successful with the help of a laboratory kit so as to find the nitrate and phosphate content in the soil. At Foothill : Moisture content = Initial wt. - Dry wt. = 10g - 8.639g = 1.361g of moisture/10g of soil Nitrate Content = 15 ppm ?? ...read more.


25 x ( 125 - 2) (125) = 4.552 mgO2/ltr Conclusion : After going through data collection and processing I have come to this conclusion that the measure of dissolved oxygen in the 3 water samples are in this pattern. D.O in Source 3 > D.O in Source 2 > D.O in Source 1 There is peculiar observation that has made me conclude that (in this case) , as there is an increase in the height of altitude , the level of dissolved oxygen has decreased . Evaluation : It was mandatory for me to keep some measures in mind before performing the experiment as there are certain errors that can cause a hindrance in the functioning as well as in the readings during the experiment � The water in the B.O.D bottle may not reach up to the brim of the bottle because of which there would be an introduction of an air bubble into the bottle and would give the wrong readings. To get rid of such an error , I poured the water slowly and steadily from the sides of the bottle so as to stop the entrance of the air buuble. ...read more.


Evaluation : While forming this experiment there could have been certain errors which could have hampered the flow of the experiment or would have affected the readings or the species count in the quadrat. �The roots of the plant species may be fixed in 1 quadrat and its shoots or off-shoots would appear in another quadrat. Anyone could get deceived by this , I was really attentive while performing this experiment. It is necessary to count the plant species according the position of their root in the quadrat and should not be included in the quadrat in which it's shoot appears. �Some of the plant species are in their early growing stages hence they would be covered by the plant species that have already matured and grown. So it is mandatory to look in between the plant species to search for the young plant species. �Few of the plant species , like the dead leaves or the dead flowers on the ground or on the plants which may not be alive should not be included while counting those particular plant species. � Accidentally stamping the plants within the quadrat, or sometimes when it's shoots are jutting out of the quadrat can alter the count of the plant species ,so it is necessary to be careful while performing such a delicate experiment. ...read more.

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