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Trees


You would need to know about each of the habitats; what trees species are usually found there and why and why are these species found here. You would have to be familiar with most of the trees found and definitely know how to key out an unknown tree. Once you get into a specific microhabitat you would lay out your transect string by tying one end to a tree by the trail and walking into the forest lay it out all of the way and tie it to another tree. You would then key out every tree that is within arms length away from the string and at least 10DBH. DBH is diameter breast height and our measure was our hands making a circle. Once we came back with all of our data, which was the trees listed and their circumference next to it we could start working on our data. We first needed to calculate our basal area of every single tree. To do this you take the circumference squared and divide it by 12.57. After this we then found the frequency of the trees by taking the totals number of transects containing the tree in a particular microhabitat and multiplied it by 100 and divided by the total number of transects which was six in our case. Next, you would find the density, which is the total number of tree species and divide it by the total number of transects. After this you would find the cover in adding up the basal area of the all of trees of the same species and divide it by the total number of transects. After you find all of these you must then find the relative frequency, density, and cover. To do this you would take the frequency, density, or cover of a species and multiply it by 100 and then divide it by the sum of the frequency, density, or cover of all of the species. Once you have done this you can find the importance value of a species by adding up its relative frequency plus the relative density plus the relative cover. That is the final step you would need to make.


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