By Bill Kleiman
Arc GIS Field Maps, known previously as Collector, is a powerful phone app. The app is free, but you do need a GIS online program to run it, which typically means you need your employer to support you. On this image you see random round dots of a few colors, each color represents a different invasive weed. There are green diamond shapes which are native plant occurrences, which represent cool plants we want to remember to come back to, perhaps to pick seed. This morning, I noted starry campion for seed picking later.
These dots/waypoints/geo-referenced points….whatever you call them….are really handy. For instance, they help us see the pattern of infestation of weeds where sometimes a strategy can come to mind. Over time we hopefully have fewer weed dots.
Now differently, note the east west line of red dots. Each dot represents at least one birdsfoot trefoil, BFT, Lotus corniculatus. I started on the east end of this field and used my phone compass to aim west and found a district tree to aim for. I took a step, looked down for BFT. If there was a plant, flowering or not, big or small, I dotted it. There was a plant sometime every step, sometime every two steps, but rarely could I go more than 5 steps without a plant within three feet of my boots. This transect took about 45 easy minutes. I tore the plants out that I found as I did not want to carry a sprayer.
Why walk a line instead of recording all occurrences in this field? I don’t have time to record every BFT in this field. That would take a week. The point of monitoring with quadrats, whether on a transect or randomly placed, is to help us understand a field by sampling a small part of it.
I know this field rather well. In the 1980s the farmer planted birdsfoot trefoil in this pasture. The soil became full of BFT seed. Three decades ago I started to boom spray the former pasture. After this decade of boom spraying we erred in deciding to plant prairie in this field. Then we had about two decades of hard labor of back pack spraying BFT, but you can see the BFT is still there. I did this monitoring transect after we had been through the field for eight hours with seven people with packs. So these are the plants we missed. Sigh.
Lesson learned: Do not plant prairie into ground that has invasive weeds.
This method of monitoring with Field Maps is intuitive, visual, easy to understand, and stored automatically with your other data. I don’t need to write a report about these weeds. You can see the pattern as well as I can.
Here I zoom out for a more complete sense of our preserve and its weed occurrences. We spend a lot of time on these spots. How can we get to treating the weeds faster and with less time, but without doing more harm than good? No easy answers, as you know.