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Soil Ecosystem Services at Statewide and Catchment Scales: A Climate Change Perspective
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Soil Ecosystem Services at Statewide and Catchment Scales: A Climate Change Perspective. |
| 개인저자 | Devine, Scott. |
| 단체저자명 | University of California, Davis. Soils and Biogeochemistry (formerly Soil Science). |
| 발행사항 | [S.l.]: University of California, Davis., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 158 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-03B. Dissertation Abstract International |
| ISBN | 9781085795012 |
| 학위논문주기 | Thesis (Ph.D.)--University of California, Davis, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
Advisor: O'Geen, Anthony T. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | Ecosystem services are the mostly unpaid and often unrecognized work natural systems do to support and enrich human life. The objective of this dissertation was to improve understanding of and highlight several ecosystem services provided by California soils, water, and agroecosystems. The studies were undertaken at two scales (statewide and catchment) in both cultivated (perennial crops) and relatively unmanaged (rangeland) landscapes. Results are discussed from a climate change perspective.In the first chapter, green water (soil stored rainfall) was quantified at statewide scale for five irrigated perennial crops (alfalfa, almonds, grapes, pistachios, and walnuts) that cover 1.46 million hectares, approximately 50% of California's irrigated landscape and representing a multi-billion dollar industry. The study objective was to evaluate green water use in irrigated agriculture as a possible opportunity to enhance water security for farmers while providing several wider environmental benefits (e.g., more water for fish, less energy needed to pump water, and fewer nitrates leached to groundwater). Using the FAO-56 dual crop coefficient model, open-source software, and integration of several statewide public datasets, I tested different rooting depths and irrigation management thresholds (allowable depletion) to determine how size of the soil water reservoir affects green water utilization and, consequently, blue water demand (irrigation). The 13-year cumulative green water utilization ranged from 17-36 million km3 out of a 57 km3 rainfall input and 162-263 km3 cumulative blue water demand. Deeper rooting or greater allowable depletion reduced blue water demand more than the increase in green water utilization, due to less frequent irrigations, which reduced soil evaporative loss. Compared to a "business-as-usual" shallow irrigation management scenario (0.5 m rooting |
| 일반주제명 | Soil sciences. Climate change. Agriculture. |
| 언어 | 영어 |
| 바로가기 | 
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