Author: Hans Jenny Publisher: Springer Science & Business Media ISBN: 1461261120 Category : Technology & Engineering Languages : en Pages : 392
Book Description
change is simply described by the rate of income and rate of loss. Our home's energy budget, our firm's inventory, our nation's debt, and humanity's numbers all have accounts that change at rates that are equal to the inputs minus the outputs. Jenny's "system view" of the soil was carried into the fertile fields of Midwestern American prairies from the laboratories of Switzerland in the late 1920s. Jenny's rate equations provided the other paradigm or world view that, I recall, brought us to the threshold of systems ecology as it later evolved in the second half of the twentieth century. As if world renown in the specialties of pedology and soil chemistry were not enough for one lifetime, excerpts below remind us that Hans Jenny has also been a perceptive outdoor field ecologist since his early Alpine expeditions with Braun Blanquet in the mid 1920s. Jenny's ecosystem studies in the pygmy forest, a further classic example of a soil-plant system "run down" over hundreds of thousands of years since its origin, continue to occupy some of the vigorous retirement time near his farm in Mendocino County. But each specific, quantitative case study, and each research area conserved (with additional hard work) for further study by future generations, fits into Jenny's coherent world view. It is that view, and its legacies of discovery and of tangible landscape preserves, which we are privileged to share with their originator in this volume.
Author: Frederick Orpen Bower Publisher: CUP Archive ISBN: Category : Science Languages : en Pages : 382
Book Description
Excerpt from The Ferns (Filicales) Treated Comparatively With a View to Their Natural Classification, Vol. 1: Analytical Examination of the Criteria of Comparison Little do ye know your own blessedness; for to travel hopefully is a better thing than to arrive, and the true success is to labour. R. L. Stevenson, Essay on El Dorado. IN this passage Stevenson enunciates a truth that applies with singular force to those who enter on morphological enquiry. To travel hopefully is the chosen pursuit of all who study large groups of organisms with a view to reducing them to order, so as to throw light on their origin and evolution. In such quests no one need expect under present conditions to arrive at the final destination of complete and assured knowledge. If any one should indulge this hope his disappointment is certain. Even if he did so arrive, and found himself able fully to demonstrate the whole truth, how greatly would the quest lose in its interest. It is in the pursuit of his El Dorado of evolutionary history, not in the arrival there, that the true blessedness of the morphologist lies. It behoves then those who travel on this journey not to hurry unduly, but to consider with critical care the manner of their journeying, rather than to seek short cuts to an elusive goal. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Julian Evans Publisher: John Wiley & Sons ISBN: 0470756829 Category : Technology & Engineering Languages : en Pages : 416
Book Description
The future of the world's forests is at the forefront of environmental debate. Rising concerns over the effects of deforestation and climate change are highlighting the need both to conserve and manage existing forests and woodland through sustainable forestry practices. The Forests Handbook, written by an international team of both scientists and practitioners, presents an integrated approach to forests and forestry, applying our present understanding of forest science to management practices, as a basis for achieving sustainability. Volume One presents an overview of the world's forests; their locations and what they are like, the science of how they operate as complex ecosystems and how they interact with their environment. Volume Two applies this science to reality; it focuses on forestry interventions and their impact, the principles governing how to protect forests and on how we can better harness the enormous benefits forests offer. Case studies are drawn from several different countries and are used to illustrate the key points. Development specialists, forest managers and those involved with land and land-use will find this handbook a valuable and comprehensive overview of forest science and forestry practice. Researchers and students of forestry, biology, ecology and geography will find it equally accessible and useful.
Author: John Jeavons Publisher: Ten Speed Press ISBN: 0307790495 Category : Gardening Languages : en Pages : 130
Book Description
From the author of our best-selling and widely beloved HOW TO GROW MORE VEGETABLES comes this "quick and dirty" introduction to biointensive gardening that shows it is not only possible but easy to grow astonishing crops of healthful organic vegetables and fruits, while conserving resources and actually helping the soil. A revolutionary approach to feeding ourselves and nurturing the land, this book includes: - Step-by-step illustrations and instructions that make these techniques simple for even the novice gardener. - Everything you need to know about planning crops, composting, harvesting, and more. - Complete resources for seeds, tools, and other garden supplies.Feed a family of four on the bounty of your backyard, or just get more out of your garden with less effort with this wonderful resource.
Author: Hans Jenny
Author: Frederick Orpen Bower
Author: 
Author: 
Author: 
Author: 
Author: Julian Evans
Author: 
Author: John Jeavons
Author: