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Ecology & Evolutionary Biology Graduate Theses & Dissertations

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Biochar As A Soil Amendment For Willow And Cottonwood Plantings In A Riparian Restoration, Brian Clyde Sechler Jan 2018

Biochar As A Soil Amendment For Willow And Cottonwood Plantings In A Riparian Restoration, Brian Clyde Sechler

Ecology & Evolutionary Biology Graduate Theses & Dissertations

Riparian areas provide some of the most valuable ecosystem services of any habitat type, both for native flora and wildlife, as well as human society. The global degradation of these critical systems makes their restoration imperative for the preservation of overall ecological integrity since depleted riparian corridors will have cascading effects that pervade upland and downstream regions alike. In western river systems there are two key limiting factors that can lead to failures during re-vegetation efforts along riparian stream banks: one is a lack of available soil nutrients, and the other is a lack of soil moisture. Biochar has been ...


Biogeochemical Couplings Among Earth’S Ecosystems: A Focus On Old-Growth Tropical Rainforest, Philip Graham Taylor Jan 2012

Biogeochemical Couplings Among Earth’S Ecosystems: A Focus On Old-Growth Tropical Rainforest, Philip Graham Taylor

Ecology & Evolutionary Biology Graduate Theses & Dissertations

This dissertation explores how physical and biological processes organize the interaction of carbon and nutrient cycles, which underpin life on Earth. In Chapter 2, I establish that ecosystem nitrate accrual exhibits consistent and negative nonlinear correlations with organic carbon availability along a hydrologic continuum from soils, through fresh- water systems and coastal margins, to the open ocean. Across this diversity of environments, we find evidence that resource stoichiometry strongly influences nitrate accumulation by regulating a suite of microbial processes that couple dissolved organic carbon and nitrate cycling.

In Chapter 3, I address the climate sensitivity of carbon cycling in old-growth ...