Over the last decade a new perspective on how forest ecosystems operate has emerged. Ecosystems appear much more flexible than we once thought. Even the most persistent is still evolving in composition. Yet for all their diversity, very similar processes are seen as operating in all forests, providing a point for comparative studies. A more balanced time perspective brings a greater appreciation of the infrequent but dominating events that shape the course of ecosystem development. Through joint studies of forests and streams we see new roles for living and dead components of both ecosystems.
For the 40th annual Biology Colloquim held April 27-28 1979 at Oregon State University, a select group of scientists was invited to share this new perspective on forest ecosystems with a wider audience. The colloquium papers are grouped into three sections within this volume. The first section (chapters 1-3) revises classical theories on community structure, succession, and ecosystems. The second section (chapters 4-8) examines in detail how forest canopies, soil microbes, and root systems operate as almost independent subsystems. The final section (chapters 9-12) focuses on the impact of the different materials-logs and leaves, soil and sediments, water and minerals--that move through forests and into stream ecosystems. Although each section is distinct in scope, they share a common link of matter and energy flow.
For permitting us the opportunity to share these ideas, we are indebted to the late Ralph Shay, who originally suggested the topic and helped arrange the colloquim. To him we dedicate this volume
