Be specific in what you want on field data enquiry. Broad and vague questions will discourage experts in silviculture from answering your questions. For example, how do I measure the seedling growth rate and the survival rate of species A on B and C fields? I hope this helps.
The type of field data collected will depend on the purpose of the study. Screening studies are typically designed to test the effects of a treatment(s) on crop survival and growth or control of a competitor species. Operational comparison studies may include crop, vegetation, soils, carbon and other environmental variables. Operational monitoring studies involve monitoring forest operations. A research could monitor a large number of variables, but politics, money and time normally constrain the study. Thus, we'll need more information about not only the forest types being studied, but also the purpose of the field studies.