One person fills the infiltration tube to a standardised level e. The distance and angle can then be recorded. Microclimate data including soil temperature, humidity and light levels can be used to support investigations into how vegetation changes across a dune system. Humus content Soil humus content is measured by weighing a dry soil sample, burning the humus in the soil, then weighing the soil left. Percentage cover is faster but is more subjective. Suggested using line transects, belt transects, quadrats and point quadrats HSW3 ;. Recording vegetation data a Species lists The simplest data that you can collect is a species list.
Person 2 should make a note of when this is done, so that it can be taken it into account when they are calculating their infiltration rate. Or you can choose to place stations at specific points of interest along the transect line. For a comparison of ground vegetation in two areas, construct a random sampling strategy. Mar 10, Throwing a quadrat does not allow Mp3 to be given for a process to give. Use ranging poles and a clinometer to collect slope profile data.
The difference between the two figures is the soil moisture content. Doing a brilliant A2 Biology Coursework in Ecology. This allows you to calculate the percentage frequency of each species for the whole sample area.
The most effective way to dry the soil sample is to use an oven a microwave oven will dobut if this is not available then you could leave the soil sample to dry overnight.
Bang the infiltration tube into the ground until it forms a seal using the wood and mallet to bang it in evenly and avoid affecting the results by stamping on the area of land being tested. A species list provides no information about how abundant each species is. Soil water content is measured by weighing the fresh soil sample, drying the sample, then weighing the dry soil. One quadrat per station is not enough. Now record the weight of the crucible and dry soil.
You will only begin to burn off the quadrafs in the soil and won’t then be able to find out either the weight or humus content accurately. The distance and angle can then be recorded.
Only remove a small amount from each place – not a trowel-load. It would be impossible to count all the plants in a habitat, so a sample is taken.
Use a random number table or random number generator on a calculator to select numbers from Ideally, the site will display all the seral stages of sand dune succession within a relatively small area. Each pair of random numbers can be used as x and y co-ordinates, using the metre interval markings oneach tape measure.
It turns its still pale green stems towards Unit 6: The effects of biotic and. In each habitat you are investigating, mark out a 10m x 10m square on the ground by laying one tape measure 10m lengthways and a second tape measure 10m at right angles to the first. For a shorter distance, such as an investigation into how vegetation changes across a single dune slack, a continuous transect could be useful. There are many possible questions that could be investigated in this way.
Discussion of niche and competition to the environment 2. Systematic sampling Systematic sampling is used where the study area includes an environmental gradient.
Microclimate data including soil temperature, humidity and light levels can be used to support investigations into how vegetation changes across a dune system. Temperature Wind speed Humidity Light intensity. An anemometer will measure wind speed directly. Practical Skills in Biology 2. To maintain water pressure, person 1 should top up the infiltration tube if their water level falls below a certain point e.
Many investigators over-estimate conspicuous plants especially those in flower and under-estimate inconspicuous plants. You will collect data across a broader belt of the dunes; a technique known as an interrupted belt transect. If two areas being compared readings must be taken simultaneously.
Person A sights the clinometer at the top of the ranging pole held by 8 and reads off the slope angle.
The difference between the two figures is the humus content, which can be expressed as a percentage of the mass of fresh soil sample.
This method is more time consuming than estimating percentage cover, but the results should be more accurate, as there is less risk of over-estimating some plants and under-estimating others.
Percentage frequency is the probability that a species will be found within a single quadrat. The bulb surrounded by a wet quacrats sleeve usually shows a lower temperature than the other because of the cooling effect of evaporation.