@article {JRN54518,
	title = {The Natural Resources Conservation Service land resource hierarchy and ecological sites},
	year = {2016},
	abstract = {Resource areas of the NRCS have long been important to soil geography. At both regional and landscape scales, resource areas are used to stratify programs and practices based on geographical areas where resource concerns, problems, or treatment needs are similar. However, the inability to quantifiably delineate and classify resource area boundaries hinders communication across the NRCS and federal agencies. Without strong standards delineating geography and concepts, resource areas become less scientifically defensible and inconsistent in addressing similar resource management issues. Furthermore, with continued development of Ecological Site concepts, there is a renewed interest in understanding the relationships between resource areas and Ecological Sites. In this paper we: (i) review the concepts and history of landscape classifications leading to the predominant regional classification systems used by federal agencies in the United States, (ii) propose strengthening the NRCS{\textquoteright}s Land Resource Hierarchy by building resource area concepts on nesting principles of subdivision instead of aggregation, and (iii) place ecological site concepts as a nested resource area within the Land Resource Hierarchy.},
	doi = {10.2136/sssaj2015.05.0305},
	url = {/files/bibliography/16-005.pdf},
	author = {S. W. Salley and Curtis Talbot and Joel R. Brown}
}
