Biogeochemistry an analysis of global change 3rd editionBiogeochemistry —winner of a Textbook Excellence Award Texty from the Text and Academic Authors Association—considers how the basic chemical conditions of the Earth, from atmosphere to soil to seawater, have been and are being affected by the existence of life. Human activities in particular, from the rapid consumption of resources to the destruction of the rainforests and the expansion of smog-covered cities, are leading to rapid changes in the basic chemistry of the Earth. This expansive text pulls together the numerous fields of study encompassed by biogeochemistry to analyze the increasing demands of the growing human population on limited resources and the resulting changes in the planet's chemical makeup. The book helps students extrapolate small-scale examples to the global level, and also discusses the instrumentation being used by NASA and its role in studies of global change. With extensive cross-referencing of chapters, figures and tables, and an interdisciplinary coverage of the topic at hand, this updated edition provides an excellent framework for courses examining global change and environmental chemistry, and is also a useful self-study guide. Upper-division undergraduate and graduate students in geochemistry, ecology, earth, and soil sciences, especially those with interest in global change or environmental chemistry.
ISBN 13: 9780123858740
Climate change models predict more frequent and severe droughts in the humid tropics. How drought will impact tropical forest carbon and greenhouse gas dynamics is poorly understood. Here we report the effects of the severe Caribbean drought on soil moisture, oxygen, phosphorus P , and greenhouse gas emissions in a humid tropical forest in Puerto Rico. Drought significantly decreases inorganic P concentrations, an element commonly limiting to net primary productivity in tropical forests, and significantly increases organic P. High-frequency greenhouse gas measurements show varied impacts across topography. The rapid response and slow recovery to drought suggest tropical forest biogeochemistry is more sensitive to climate change than previously believed, with potentially large direct and indirect consequences for regional and global carbon cycles. The near-constant warm temperatures and moist soils typical of humid tropical forests support high rates of carbon C cycling, and globally significant exchanges of C with the atmosphere 1 , 2.
Human activities in particular, from the rapid consumption of resources to the destruction of the rainforests and the expansion of smog-covered cities, are leading to rapid changes in the basic chemistry of the Earth. This expansive text pulls together the numerous fields of study encompassed by biogeochemistry to analyze the increasing demands of the growing human population on limited resources and the resulting changes in the planet's chemical makeup.
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The pioneering watershed-ecosystem studies initiated at the Hubbard Brook Experimental Forest in underpin this thoroughly updated and in-depth analysis of the biogeochemistry of a forested ecosystem in the White Mountains of New Hampshire. In a novel synthesis of almost 50 years, this third Edition summarizes and interprets these unique data on precipitation and streamwater chemistry, hydrology, and weathering and also considers the role of atmospheric gases and particles as they flow into and out of the ecosystem. Long-term, complete annual budgets are presented for many critical elements in the ecosystem, providing for the first time a comparative view of biogeochemical dynamics in the Hubbard Brook watershed-ecosystems. These results show how an ecosystem is connected to global biogeochemical cycles by its inputs and outputs of water and nutrients. Gene E.