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- All Subjects: Sustainability
Description
Irrigation agriculture has been heralded as the solution to feeding the world's growing population. To this end, irrigation agriculture is both extensifying and intensifying in arid regions across the world in an effort to create highly productive agricultural systems. Over one third of modern irrigated fields, however, show signs of serious soil degradation, including salinization and waterlogging, which threaten the productivity of these fields and the world's food supply. Surprisingly, little ecological data on agricultural soils have been collected to understand and address these problems. How, then, can expanding and intensifying modern irrigation systems remain agriculturally productive for the long-term? Archaeological case studies can provide critical insight into how irrigated agricultural systems may be sustainable for hundreds, if not thousands, of years. Irrigation systems in Mesopotamia, for example, have been cited consistently as a cautionary tale of the relationship between mismanaged irrigation systems and the collapse of civilizations, but little data expressly link how and why irrigation failed in the past. This dissertation presents much needed ecological data from two different regions of the world - the Phoenix Basin in southern Arizona and the Pampa de Chaparrí on the north coast of Peru - to explore how agricultural soils were affected by long-term irrigation in a variety of social and economic contexts, including the longevity and intensification of irrigation agriculture. Data from soils in prehispanic and historic agricultural fields indicate that despite long-lived and intensive irrigation farming, farmers in both regions created strategies to sustain large populations with irrigation agriculture for hundreds of years. In the Phoenix Basin, Hohokam and O'odham farmers relied on sedimentation from irrigation water to add necessary fine sediments and nutrients to otherwise poor desert soils. Similarly, on the Pampa, farmers relied on sedimentation in localized contexts, but also constructed fields with ridges and furrows to draw detrimental salts away from planting surfaces in the furrows on onto the ridges. These case studies are then compared to failing modern and ancient irrigated systems across the world to understand how the centralization of management may affect the long-term sustainability of irrigation agriculture.
ContributorsStrawhacker, Colleen (Author) / Spielmann, Katherine A. (Thesis advisor) / Hall, Sharon J (Committee member) / Nelson, Margaret C. (Committee member) / Sandor, Jonathan A (Committee member) / Arizona State University (Publisher)
Created2013
Description
This dissertation develops a multidimensional approach to examine the ways in which people in small-scale societies create, perpetuate, justify, and overcome social inequality. Inequality can exist within a number of independent domains, some of which are likely to be subtle and dissimilar from those familiar to Western society. The advantages and disadvantages of inequality can shift between various groups and across social scales. Recent ethnographic work suggest that the most common domain of inequality in small-scale societies may involve status accrued to founding lineages. This hypothesis is examined in relation to four additional domains, each inspired by ethnographic data from indigenous groups of the U.S. Southwest: differential access to productive resources, ritual knowledge and practice, nonlocal objects and styles, and material wealth. Analyses are carried out with data from seven archaeological sites in the Mimbres region of southwestern New Mexico, spanning a period from approximately 250 to 1130 C.E. Results show that inequality was present throughout the Mimbres archaeological sequence but that it shifted over time, across space and social scales, and varied in magnitude in non-directional ways. Results also identify persistent factionalism wherein groups vied for moral authority based on differences in residential antecedence and justified via religious differences. Insight from this research benefits the social sciences by developing a number of methodological approaches, particularly to the archaeological study of primacy and antecedence, by demonstrating the necessity of a nuanced, multi-faceted approach to inequality, and by revealing the complex and plastic nature of inequality.
ContributorsRussell, Will G. (Author) / Nelson, Margaret C. (Thesis advisor) / Hegmon, Michelle (Thesis advisor) / Nelson, Ben (Committee member) / Arizona State University (Publisher)
Created2016