Below, we answer some frequently-asked questions about tree monitoring. Relevant sub-protocols from the Monitoring Framework, and a step by step guide to tree monitoring, are attached.
Why do we use square monitoring plots for the 30m x 30m (large) plots?
There are advantages to both circular and square monitoring plots. The shape of the plots was debated, and we chose to go with square plots to allow us to align with remote sensing analyses that use pixels.
Why do we use square plots for the 3m x 3m subplots?
The shape of the subplots should match the shape of the large plots to avoid confusion. See answer above about shape of large plots.
Why do we take Y2.5 measurements?
Even though we assume that management activities take place between planting and Y2.5 for implementers to know how their trees are performing, the Y2.5 vegetation monitoring is the official record for project performance prior to the end of the project. If we did not take the Y2.5 measurement, we would have no indication of performance until the end of the project when it’s too late to adaptively manage.
Why do we take GPS points of all four corners of the large plots and the subplot centroid?
GPS accuracy is low in some situations, so having multiple points increases the likelihood of being able to find plots again, and gives us confidence in the location of the plots.
How do we randomly generate the location of the subplot?
Stand at a plot corner and use a random number generator twice (for distance along plot boundary and distance into the plot) to determine where to put plots.
What is the conversion between diameter and circumference?
Diameter = circumference/3.14, so a tree with a 31.4 cm circumference at breast height has a DBH of ~10cm
For large homogenous sites, can I do fewer tree monitoring plots?
A power analysis can be used to determine the appropriate number of sites. This analysis must be reviewed and approved by the CI global monitoring team to be accepted
Can I change the dimensions of my plots?
No, unless you meet one of the exceptions specified in the framework
How can I access the survey for the tree monitoring data collection?
The survey can be accessed using the app KoboCollect or directly clicking in the link: Tree monitoring survey
What is KoboCollect and how it is used for tree monitoring data collection?
KoboCollect is an android-based application used to collect data in the field. The survey available in the IMP is used for tree monitoring data collection.
What additional reporting/monitoring can I add to my PPC project?
There are several optional monitoring components that can be added to a PPC project if there are resources available and you have the interest to do so. These include establishing landscape level control sites (plot level controls are a required minimum, sub-protocol 2), reporting on trees grown in nurseries (sub-protocol 5), conducting household surveys (sub-protocol 10), freshwater monitoring (sub-protocol 13), and faunal biodiversity monitoring (sub-protocol 15).
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