I have a dataset (vector layer) with 150 focal points, each of them retaining an observation of several ecological variables (attributes). I want to extract data (sum and average of several variables) from increasing multi-concentric rings around each focal points (same radii for all points). For example, I want to start with radius=1 Km around all the points and get a table showing new values calculated over the buffer coverage. Then, I want to increase the radius to 5 Km, 10 Km, 50 Km, 100 Km, to get the relevant datasets. (Eventually, I will have to perform more complex, separate statistical analyses from these tables). Would it be possible by using QGIS? I am new of GIS softwares and I have no idea how to handle this.