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• Level: GCSE
• Subject: Maths
• Word count: 1056

# Woodlands: Random Quadrat Sampling Technique.

Extracts from this document...

Introduction

#### WOODLANDS: RANDOM QUADRAT SAMPLING TECHNIQUE

##### INTRODUCTION

Dog’s mercury is one of the first plants to break through the dark earth in damp and woodland areas. It turns its still pale green stems towards the light. Both environmental and genetic factors influence dog’s mercury during this period of growth, therefore variable factors such as light, temperature, water and nutrient availability affect it growth.

This study will attempt to investigate random sampling at a number of sites and taking measurements of light intensity with a light meter. Graphs should then be plotted of light intensity against number of shoots per 0.5m2 and against shoot height.

##### METHOD
• Two sites are chosen at random, one north facing the other south facing. A group was assigned to each site.
• A light intensity reading was taken in an open area and was accounted for as 100% light intensity.
• Starting at a site in a clearing providing a sunny open position, random sampling using 50cm2 quadrats took place.
• The number of shoots of dog’s mercury within it where recorded and the mean shoot height of five shoots. Light intensity and % canopy cover was also recorded.
• Nine further random quadrats were taken, as the group moved further into the dense shaded area of the woodland.
• Results were then compared to the other site.

Middle

 QUADRAT NUMBER NUMBER OF PLANTS MEAN HEIGHT OF PLANTS (cm) % CANOPY COVER %LIGHT INTENSITY 1 54 22 2 80 2 38 21 30 81 3 18 11 70 78 4 14 7 50 77 5 48 12 50 78 6 8 11 70 76 7 64 23 45 78 8 17 18 40 77 9 22 15 15 78 10 30 25 30 79

Graph Showing The Effect Of Light Intensity (North Facing) On Number Of Dog’s Mercury Shoots.

Graph Showing The Effect Of Light Intensity (North Facing) On Shoot Height Of Dog’s Mercury

Graph Showing The Effect Of Light Intensity On The Number Of Dog’s Mercury.

Conclusion

##### EVALUATION

From the results obtained it can be said that on the north-facing site there is an inverse relationship between light intensity and the height, and number, of Dog’s mercury shoots. This is as expected as Dog’s mercury tends to grow in woodland area and as the light intensity decreases it grows towards the sun, and further apart from other plants, to maximise absorption of light.

However, on the south side the results are not as expected. As light intensity increases so does the number of plants. The canopy cover may be a reason for this, because the site chosen, although being in the south, had a lot of canopy cover from surrounding areas, which blocked the light. The north-facing site was in an opening and on a hill, therefore got more light.

The t-test suggests that there is no relationship between the two sites therefore it is dismissible.

This investigation could be improved by having repeated quadrats samples in relatively the same area, or by having samples at certain intervals.

An extension of this investigation could involve taking into account the area of the leaf.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations section.

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