The phrase "at the leaf level" is correct and usable in written English.
It can be used in contexts related to hierarchical structures, such as data trees, organizational charts, or biological classifications, where "leaf level" refers to the most basic or terminal nodes.
Example: "The analysis was conducted at the leaf level to ensure that all individual data points were considered."
Alternatives: "at the most basic level" or "at the terminal level".
At the leaf level, NIR reflectance decreased in productive sites where %N increased, and δ13C decreased, through the season.
When inspecting detail at the leaf level, the structure near the root is difficult to understand because of the major differences in scale.
A good agreement was found between gas exchange and variable chlorophyll fluorescence at the canopy level and variable fluorescence at the leaf level.
Transpiration efficiency of triticale was also higher at the crop level, in spite of similar transpiration efficiency at the leaf level.
Our recent work (Ainsworth et al., 2014; Serbin et al., 2012) showed that reflectance spectroscopy could be used to estimate Vcmax at the leaf level.
While the amount of each plant material varied significantly along the land-cover gradient, foliar optical properties remained relatively stable, supporting the hypothesis that resource variation (e.g., water and nutrients) is more strongly resolved at the scale of whole plant canopies (e.g., via allocation and production) than at the leaf level.
The GOGAT activity increased during Fe deficiency both at the root and at the leaf levels in all the assayed days and reaching its maximum (+90%) at 7 d.
The process of forwarding a location update or a location query can be imagined as traversing a path in the complete binary tree beginning at the root and moving toward the leaf level.
Gornish (2014) conducted an exploratory analysis to assess the effects of elevated temperature and nitrogen deposition at different levels of spatial organization at the leaf level, the plant level and the community level, in the presence and absence of experimental invasion in an old-field plant community in northern Florida.
ΔF/F′m was useful in detecting stress-induced changes in the photosystem before any visible signs of damage were evident at the leaf-level.
In the successive weeks, ρw image intensity decreased at the whole leaf level and in the different leaf tissues (parenchyma and main leaf vein) and leaf areas.
