I am drafting an article. I have a statement that I was hoping to get some suggestions on appropriate citations. Evapotranspiration rate is dependent on tree species as well as the rate of transfer of the water generated during the process. Thanks
Schume, H., Hager, H., & Jost, G. (2003). Soil water dynamics and evapotranspiration in a spruce monoculture and a mixed broadleaf-conifer stand. Ekologia(Bratislava)/Ecology(Bratislava), 22, 86-101.
The Journal of Environmental Quality had a special section on urban forest ecosystem services. A few of the papers touch upon this issue. The special section introduction can be found at:
From the posts above, you now have some appropriate sources to cite. What I will add is that some statements fall into the category of "common knowledge" or "common sense" and thus don't need a citation. One example of a "common knowledge" statement that doesn't need a citation is "the sun rises in the east." One could certainly come up with a citation, but it would be superfluous. My two-cents worth is that a statement about transpiration being dependent on tree species falls into that category. What doesn't seem to have been addressed yet is the second part of your statement "as well as the rate of transfer of the water generated during the process." By this do you mean the rate at which the water vapor that has left the tree through transpiration is carried away from the vicinity of the tree (at a variety of scales)? If so, I think that is also included in the "common knowledge" category. Regardless of species, windy conditions will increase evapotranspiration over completely still conditions by keeping the relative humidity lower by carrying away the water vapor generated by evapotranspiration. Perhaps you are interested in the relative effects of a given wind velocity on the evapotranspiration of different species? If so, then I think that would merit a citation.
Alternatively, you might be referring to the evaporation part of evapotranspiration that includes the loss of soil moisture directly to the air. Since different tree species are going to promote different soil surface conditions beneath and around them, then the evaporation part of the equation is likely also influenced by the tree species. Some tree species, like Juniper, actively suppress undergrowth while others do not seem to. If you want to separate the evaporation part of the evapotranspiration from the transpiration part, and work with the species dependency of those two separate pieces, then I think you do need a citation. One which I am unhelpfully not able to provide. Typically, people are concerned with the combined effect and that is the reason we have the term evapotranspiration to begin with. Yet I can imagine reasons that you might be concerned with separating the two phenomena and dealing with them independently.