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How light intensity affects biodiversity

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How Light Intensity Affects Biodiversity Introduction : I chose to do a study into how light intensity affects biodiversity because I thought it would be an interesting and unusual topic to investigate. Also, one of the themes we do is on organisms and the environment, and part of that topic is water and light are important to living organisms. I carried out my investigation at the top of the slope at the side of the sports hall, and I took all of my results at the same level. The source of shade was two trees near the top of the slope. I am going to test the hypothesis that the higher the light intensity, the more species there will be. I believe this because plants need light to grow, so I would think that where it is lighter, more plants would be vying for it. I will be measuring the amount of species and the percentage of ground they cover, (and how much ground is bear,) ...read more.


I got around this difficulty by trying to only count where the roots of the plants were as ground covered by the plants. Another complication was that under the trees, the light kept on changing as the trees swayed in the wind, so I had to use the intensity it stayed at for longest. Results : Light Intensity (LUX) Plant Species Percentage Covered Number of Plant Species 704 Clover Grass Ragwort Bare 6 87 1 6 3 598 Grass Bare 88 12 1 053 Clover Grass Bare 7 79 14 2 022 Daisy Ragwort Dandelion Plantain Grass Bare 1 5 2 2 68 22 5 034 Plantain Ragwort Grass 12 1 87 3 065 Clover Self heal Grass 2 2 96 3 014 Self heal Clover Ragwort Grass Bare 5 3 8 79 5 4 014 Dandelion Self heal Ragwort Grass Bare 5 1 9 49 36 4 013 Dandelion Ragwort Moss Grass Bare 3 5 4 80 8 4 014 Red deadnettle Grass Bare 8 90 2 2 331 Grass Bare 99 1 1 283 Plantain Ragwort Grass Bare 5 ...read more.


54 7 14 25 3 128 Moss Grass Red deadnettle Miscelaneous Bare 17 34 13 31 5 4 157 Nettle Moss 80 20 2 Conclusion : My results show that there is no real difference in the different amount of species in low light intensity compared to the number in high light intensity, I noticed, when collecting my data, that the plants in the sun were larger and healthier looking. My results are not reliable because I used a tree to provide the shade, and that could have affected the species growing underneath it. Also, after the 21st result, the sports halls shadow affected the results. I think I did collect a wide enough range of data to show a very general view of what the real picture is. I don't think my method was particularly accurate, but it was accurate enough for the purposes of my investigation. I would have preferred to have done another reading to make sure my results were accurate, but that wouldn't have been practical for me as my experiment takes a long time to do. ...read more.

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Here's what a teacher thought of this essay

3 star(s)

There has clearly been effort that has gone into collecting the results; however there are issues with this report:
1. There are lots of subheadings missing.
2. The report does not contain any researched information on the effects of light of the growth of plants.
3. The report is missing several sections including an evaluation.

Marked by teacher Luke Smithen 23/07/2013

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