Need help summing and merging tables based on shared column

Hey all,

I have two datasets; one comprised of data gathered at a point and another comprised of stem densities taken at 4 quadrants around each survey points. I need to add the sum of the stem densities at each survey point and merge them into one table based on the column named "Survey ID". I'm new to Excel and haven't figured out how to do this. I've attached a sample of the dataset to this forum post, thanks for any help!