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Accueil du site → Doctorat → États-Unis → 2017 → Plant and Soil Recovery Along Transmission Power Line Corridors in the Colorado Desert of Southern California

University of California, Los Angeles (2017)

Plant and Soil Recovery Along Transmission Power Line Corridors in the Colorado Desert of Southern California

Prabhu, Setal Sridhar

Titre : Plant and Soil Recovery Along Transmission Power Line Corridors in the Colorado Desert of Southern California

Auteur : Prabhu, Setal Sridhar

Université de soutenance : University of California, Los Angeles

Grade : Doctor in Environmental Science and Engineering 2017

Résumé partiel
The desert habitats of southern California have been subject to numerous anthropogenic disturbances. Recovery of the disturbed habitat can occur naturally or through human intervention (active restoration). Increasing energy demand and a push towards renewable sources like solar thermal and wind, often located in desert regions, will continue to impact the deserts of southern California. Electricity generated at the source (e.g. solar plant) is transported over long distances to the customer using transmission power lines which also traverse the desert habitat. This dissertation focuses on the natural recovery of vegetation and soil following impacts from transmission power line construction. The main objectives of this dissertation are to : 1. Evaluate vegetation recovery in sites impacted by transmission line construction using Landsat imagery and normalized difference vegetation index (NDVI) ; 2. Evaluate vegetation recovery about thirty years after construction using field survey data ; and 3. Evaluate natural soil recovery in sites impacted by transmission line construction. The study area, dominated by creosote bush (Larrea tridentata) and white bursage (Ambrosia dumosa), is in the lower Colorado Desert in southern California. Data are collected in areas impacted during transmission power line construction and in areas undisturbed during construction. I assess vegetation recovery in the field by measuring species richness, plant density, and percent cover. Soil recovery is assessed by comparing soil characteristics such as infiltration rate, texture, bulk density, soil compaction, salinity, pH, soil organic matter, carbon stocks, and soil moisture content between impact and control sites. The dissertation is subdivided into the following five chapters : an introduction (chapter 1), three chapters of original research addressing the main objectives listed above (chapters 2–4), and a conclusion of the work (chapter 5).

Mots Clés : Ecology ; Environmental science ; Colorado Desert ; Disturbance ; Larrea tridentata ; NDVI ; Recovery ; Soil

Présentation et version intégrale

Page publiée le 5 octobre 2017