DOCSLIB.ORG

Modeling Hydrochemical and Vegetation Responses of High-Elevation Forested Watersheds to Future Climate and Atmospheric Deposition

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Modeling Hydrochemical and Vegetation Responses of High-Elevation Forested Watersheds to Future Climate and Atmospheric Deposition The University of Southern Mississippi The Aquila Digital Community Dissertations Spring 5-1-2021 Modeling Hydrochemical and Vegetation Responses of High- elevation Forested Watersheds to Future Climate and Atmospheric Deposition Changes in the Southeastern U.S. Hailong Huang Follow this and additional works at: https://aquila.usm.edu/dissertations Part of the Forest Management Commons, Other Ecology and Evolutionary Biology Commons, and the Other Forestry and Forest Sciences Commons Recommended Citation Huang, Hailong, "Modeling Hydrochemical and Vegetation Responses of High-elevation Forested Watersheds to Future Climate and Atmospheric Deposition Changes in the Southeastern U.S." (2021). Dissertations. 1890. https://aquila.usm.edu/dissertations/1890 This Dissertation is brought to you for free and open access by The Aquila Digital Community. It has been accepted for inclusion in Dissertations by an authorized administrator of The Aquila Digital Community. For more information, please contact [email protected]. MODELING HYDROCHEMICAL AND VEGETATION RESPONSES OF HIGH- ELEVATION FORESTED WATERSHEDS TO FUTURE CLIMATE AND ATMOSPHERIC DEPOSITION CHANGES IN THE SOUTHEASTERN U.S. by Hailong Huang A Dissertation Submitted to the Graduate School, the College of Arts and Sciences and the School of Ocean Science and Engineering at The University of Southern Mississippi in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Approved by: Dr. Wei Wu, Committee Chair Dr. Patrick Biber Dr. Kevin Dillon Dr. Robert Leaf May 2021 COPYRIGHT BY Hailong Huang 2021 Published by the Graduate School ABSTRACT Changes in climate and atmospheric acidic deposition alter biogeochemical cycles in forested ecosystems. I investigated the responses of vegetation, soil, and hydro-related processes to changes in climate and acidic deposition at five high-elevation forests in the southeastern U.S. using a biogeochemical model - PnET-BGC model. I focused on change-points and thresholds concepts that were less studied in forest ecosystems as well as seasonal variability of responses and extreme events. I applied principal component analysis (PCA) to reduce the dimensionality of data. I developed a Bayesian multi-level model to derive key biogeochemical variables response to temperature and precipitation (local) and latitude and elevation (regional) with uncertainty accounted for. The first principal components (PC1s) explain 50-60% and 40-50% of the variance in the 17 main biogeochemical variables simulated from the model at the Coweeta Basin (CWT) and Shenandoah National Park (SNP) respectively. PC1s at CWT are highly correlated to transpiration, gross and net primary production (GPP and NPP), soil base saturation, soil Al:Ca ratio, and stream chemistry (Ca2+ and K+), while PC1s at SNP are highly correlated to NPP, transpiration, and stream base cations. The key biogeochemical processes show strong seasonality in their response to future climate change. Higher latitudinal sites have earlier but fewer change-points than lower latitudes from 1931 to 2100. Vegetation at higher-elevation forests appears more sensitive to climate change, while soil and streams are more sensitive at the lower-elevation forests. Flooding and drought will become more frequent, and soil and stream will become more acidic under climate change. Regional analysis demonstrates that temperature tends to drive key biogeochemical variables more significantly than precipitation. Winter shows the least sensitivity to climate change in ii NPP, transpiration, and acid neutralization capacity 3 (ANC) at all five sites. In addition, latitude and elevation influence the sensitivity of these biogeochemical variables to temperature and precipitation at some degree. Change in acidic deposition will likely shift the biogeochemical processes response to climate change differently, depending on biogeochemical processes, season, and the direction and magnitude of change in acidic deposition. The effect is minimal for NPP, and summer and winter will have the largest shifts. iii ACKNOWLEDGMENTS I would like to express my sincere gratitude to my advisor, Dr. Wei Wu, who has given me the opportunity to pursue my Ph.D. under her guidance. Without her great patience and encouragement, I am not sure I could finish my study here through these years. Her insightful questions, challenging comments, and feedback always pointed me to the right direction especially toward the end of my study here. With her diligence and professionalism, she is not only my advisor but also my role model both in life and work. I could never ask for a better advisor to pursue my Ph.D. and I will be indebted to her for the rest of my life. My profound gratitude also goes to my other committee members: Dr. Patrick Biber, Dr. Kevin Dillon, and Dr. Robert Leaf, as well as my previous committee member Dr. Katherine Elliott from the USDA Forest Service at the Southern Station at Coweeta, NC. With their extremely generous support, guidance, encouragement, and professionalism, I have eventually completed my dissertation project successfully. I would also like to thank the Environmental Protection Agency through the STAR program for providing the funding for this research. I want to say thanks to the following professors and their labs: Dr. Katherine Hayhoe and Anne Stoner, for providing the downscaled climate data; Dr. Charles Driscoll and Dr. Afshin Pourmokhtarian, for helping with the PnET-BGC model, data, and manuscripts; Dr. Chelcy Miniat and Dr. Jennifer Knoepp, for sharing data, papers, and insights on Coweeta Basin; Dr. Deepak Mishra, for financially supporting me for one year through one NASA proect; Dr. Tina Masterson and the Department of Chemistry of the University of Southern Mississippi, for supporting me through many years of studying here. 5 I would like to give thanks to my department and school, as well as my current and past lab members and friends who iv have impacted my life deeply: Dr. Shuo Shen, Jason Tilley, Tyler Hardy, Yimu Yang, Evan Grimes, Devin Jen, Kodi Feldpausch, Dr. David Cotton, and many others. Finally, I would like to say thanks to my family and especially to my mom. I feel sorry for keeping her waiting for so long. v DEDICATION To my beloved parents, for their endless love, support, and encouragement. vi TABLE OF CONTENTS ABSTRACT ........................................................................................................................ ii ACKNOWLEDGMENTS ................................................................................................. iv DEDICATION ................................................................................................................... vi LIST OF TABLES ............................................................................................................. xi LIST OF ILLUSTRATIONS ........................................................................................... xiii LIST OF ABBREVIATIONS ........................................................................................ xviii CHAPTER I – INTRODUCTION ...................................................................................... 1 1.1 Climate impacts to forested watershed ..................................................................... 2 1.1.1 Impacts to forest ................................................................................................. 2 1.1.2 Impacts to hydrology ......................................................................................... 3 1.1.3 Impacts to soil .................................................................................................... 4 1.2 Atmospheric deposition impacts to forested watershed ............................................ 5 1.3 PnET-BGC model and modeling approach .............................................................. 6 1.4 Study sites ............................................................................................................... 10 1.5 Overall objective and general hypotheses............................................................... 11 CHAPTER II IMPACT OF CLIMATE CHANGE ON HYDROCHEMICAL PROCESSES AT TWO HIGH-ELEVATION FORESTED WATERSHEDS IN THE SOUTHERN APPALACHIANS, U.S. ............................................................................. 15 Abstract ............................................................................................................................. 15 vii 2.1 Introduction ............................................................................................................. 17 2.2 Methods................................................................................................................... 20 2.2.1 Study area......................................................................................................... 21 2.2.2 Model description, inputs and calibration ........................................................ 22 2.2.3 Principal component analysis (PCA) ............................................................... 29 2.2.4 Seasonal analysis ............................................................................................. 29 2.2.5 Change-points detection and large climate variability..................................... 30 2.2.6 Threshold analysis ........................................................................................... 31 2.2.7 Hydrological extremes and acidification status ............................................... 31 2.3 Results
Load more

Recommended publications
  • Individual and Organizational Donors
    INDIVIDUAL AND ORGANIZATIONAL Mr. Saumya Nandi and Ms. Martha Delgado Edward & Rose Donnell Foundation Dr. Tim D. Noel and Mrs. Joni L. Noel Mr. and Mrs. John A. Edwardson DONORS Orange Crush, LLC Ms. Amberlynne Farashahi Park Avenue Financial Group Trust Mr. and Mrs. Blair Farwell $100,000 and above Mr. and Mrs. Mark J. Parrell The Field Foundation of Illinois Anonymous (4) The Pritzker Pucker Family Foundation Fortune Brands, Inc. Bank of America Mr. Richard Proulx Franklin Philanthropic Foundation BlackEdge Capital Bruce and Diana Rauner Mr. Philip M. Friedmann The Chicago Community Trust The Regenstein Foundation Futures Industry Association Feeding America Mr. and Mrs. Bradley S. Reid Garvey's Office Products Ms. Susan E. Grabin The Rhoades Foundation GCA Services Group, Inc. Hardison Family Foundation Mr. and Mrs. James H. Roth General Iron Industries Charitable Foundation Mr. and Mrs. Raymond L. Harriman Roundy's Foundation Dr. Glenn S. Gerber and Ms. Linda S. Schurman Hillshire Brands Foundation The Satter Family Foundation Gethsemane United Church of Christ Daniel Haerther Living Trust Mr. and Mrs. Travis Schuler Mr. and Mrs. Brent Gledhill Mr. Albert F. Hofeld Mrs. Rose L. Shure Goldberg Kohn, Ltd. Mr. Michael L. Keiser and Mrs. Rosalind Keiser Julie and Brian Simmons Foundation Golub & Company Kraft Foods Group Foundation SmithBucklin Corporation Google, Inc. Ann Lurie Revocable Trust The Smogolski Family 2008 Mr. and Mrs. Andrew M. Gore Polk Bros. Foundation Charitable Lead Trust W.W. Grainger, Inc. Share Our Strength The Telos Group LLC Grand Kids Foundation Mr. William R. Shepard Stanley and Lucy Lopata Charitable Foundation Ms.
    [Show full text]
  • Honoring the Innovative Spirit
    1 Honoring the Innovative Spirit “American Airmen characteristically view our nation’s security challenges differently—globally and without boundaries. Our successes are based on Airmen adapting, innovating, and pioneering new solutions to intractable problems. The Doolittle Raiders are the epitome of this innovative spirit of airmanship. We owe these 80 men, as well as their Army and Navy teammates, a debt of gratitude. Thank you for inspiring all of us, every day since then.” Acting Secretary of the Air Force Eric Fanning, speaking at the Doolittle Tokyo Raiders’ Final Celebration and Toast at the National Museum of the United States Air Force®, November 9, 2013 We dedicate our 2013 Annual Report to the Doolittle Tokyo Raiders of 1942 and their innovative spirit. Our Mission he Air Force Museum Foundation, Inc was chartered in 1960 as a 501(c)(3) nonprofit organization with the purpose of assisting the TUnited States Air Force Museum (now the National Museum of the United States Air Force or NMUSAF) in its efforts to engage and educate the public on the important role of the USAF in our nation's defense. We serve as a philanthropic corporation that supports the development and expansion of the facilities of the National Museum of the U.S. Air Force. In addition, the Foundation provides limited funds each year to the Museum for special projects and underwrites several programs involving a wide range of activities geared toward education, volunteer support, special events, and promotional efforts. The National Museum of the United States Air Force is a USAF facility that is funded by the Air Force for normal operations and maintenance costs.
    [Show full text]
  • Report Idea 1
    annual report 2005 Innovation and the Integrity of Science The American Association for the Advancement of Science (AAAS) is the world’s largest general scientific society, and publisher of the journal, Science (www.sciencemag.org). AAAS was founded in 1848, and serves 262 affiliated societies and academies of science, reaching 10 million individuals. Science has the largest paid circulation of any peer-reviewed general science journal in the world, with an estimated total readership of 1 million. The non-profit AAAS (www.aaas.org) is open to all and fulfills its mission to “advance science and serve society” through initiatives in science policy; international programs; science education; and more. For the latest research news, log onto EurekAlert!, www.eurekalert.org, the premier science-news Web site, a service of AAAS. Table of Contents 2 Welcome Letter 4 Evolution — 2005 Chronology 6 Science Policy and Security 8 International Impacts 10 Science Education and Careers 12 Science Breakthroughs 14 Engaging the Public 16 AAAS Awards 20 Golden Fund Update 22 AAAS Fellows 26 Acknowledgement of Contributors 32 Financial Summary for 2005 33 AAAS Board of Directors, Officers and Information 1 Year in Review: 2005 WELCOME FROM THE CHAIR, SHIRLEY ANN JACKSON, AND THE CEO, ALAN I. LESHNER In a global economy, our prosperity, safety, and overall well-being depend more than ever upon our capacity for innovation. Geopolitical tensions, exacerbated by an uncertain energy future, underscore the need to step up the pace of fundamental scientific discovery. In the United States, unfortunately, a quiet crisis confronts us as scientists and engineers are retiring in record numbers and too few students enter the pipeline.
    [Show full text]
  • Fall 2005 4.5 MB
    The Journal o f Pacific Union College Fall 2005 Remembering the Early Decades From horse and buggy to Model T Ford editorial viewpoint viewpoint STAFF THROUGH THE YEARS by Thea Hanson Executive Editor Michelle Konn Rai, ’97 | [email protected] Editor Thea Hanson, ’74 | [email protected] For years I watched Lois walk by my house early in the morning Editorial Assistant Lainey S. Cronk, ’04 | [email protected] Alumni Editor Herb Ford, ’54 | [email protected] and again in the evening, doing the rounds with her little grey dog, Layout and Design Heidi Bristol Lukowicz, ’99 | [email protected] Art Director Cliff Rusch, ’80 | [email protected] Fifi. When I first moved into Lois’ neighborhood, Lois was 83 years Photo Editor Heidi Bristol Lukowicz, ’99 | [email protected] Contributing Photographers Thea Hanson, ’74; Judy Park ’03; old and walking nearly two miles every day. Even at 102 years, she Bob Wilson, att. ’77-’78 Contributing Writers Richard Utt, ’45 still walks around the neighborhood today, but she adds, “Instead of Copy Editor Thelma Winter taking 12 minutes, it now takes me 40 minutes.” PUC ADMINISTRATION President Richard Osborn Thea Hanson with Lois (Wheeler) Berry, att. ’22-’23, is my heroine— former Healdsburg dormitory and turned it into a Vice President for Academic Administration Ileana Douglas Charles & Miriam Lois Berry at Lois’ my mentor. Whenever I feel like complaining, I think hospital and the living quarters where Lois grew up. Vice President for Financial Administration John Collins, ’70 4 Student pioneers acquire education home in Angwin. of Lois. I can still picture her across the road from When I showed her the Class of ’23 photo, Lois Vice President for Advancement Pam Sadler and find love at PUC my house, at 100 years of age swinging that pick ax immediately started naming her classmates and Vice President for Student Services Lisa Bissell Paulson and doing battle against the star thistles in her yard.
    [Show full text]
  • THE BORDER and ITS BODIES AMERIND STUDIES in ANTHROPOLOGY Series Editor, Christine R
    THE BORDER AND ITS BODIES AMERIND STUDIES IN ANTHROPOLOGY Series Editor, Christine R. Szuter with special assistance from Joe Wilder and the Southwest Center of the University of Arizona AMERIND STUDIES IN ANTHROPOLOGY THE BORDER AND ITS BODIES THE EMBODIMENT OF RISK ALONG THE U.S.- MÉXICO LINE EDITED BY Thomas E. Sheridan and Randall H. McGuire e University of Arizona Press www .uapress .arizona .edu © by e Arizona Board of Regents All rights reserved. Published ISBN- : - - - - (cloth) Cover design by Leigh McDonald Publication of this book is made possible in part by the proceeds from a permanent endowment created with the assistance of a Challenge Grant from the National Endowment for the Humanities, a federal agency. Library of Congress Cataloging- in- Publication Data Names: Sheridan, omas E., editor. | McGuire, Randall H., editor. Title: e border and its bodies : the embodiment of risk along the U.S.- México line / edited by omas E. Sheridan and Randall H. McGuire. Other titles: Amerind studies in anthropology. Description: Tucson : e University of Arizona Press, . | Series: Amerind studies in anthropology | Includes bibliographical references and index. | Sum- mary: “is volume oers a critical investigation of the risk and the physical toll of migration along the U.S. southern border”— Provided by publisher. Identi£ers: LCCN | ISBN (cloth) Subjects: LCSH: Immigrants—Mexican- American Border Region—Social conditions. | Border crossing—Mexican- American Border Region. | Mexican- American Border Region—Emigration and immigration—Social aspects. Classi£cation: LCC JV .B | DDC ./—dc LC record available at https://lccn.loc.gov/ Printed in the United States of America ♾ is paper meets the requirements of ANSI/NISO Z .
    [Show full text]
  • Walters Guilty As Charged, Dunbar Went to Hub and Was So Action on the Apolication for the Given by Dr
    AN EXPRESSION OF IPPRECIATION! For your past trade and hopes of meriting your continued patronage, we will give -way, absolutely FREE, on Saturday, June 6th, A Twenty-Dollar SOLID BRASS BED, Satin Finish! Without one penny of expense to you. ONLY HOLD THE LUCKY TICKET. We are now enjoying the best and most satisfactory trade we've had since our establishment. Customers, faithful and loyal, who have tried us through thick and thin, and still stick. New customers added daily, who learn through others of the true courtesy and fair dealing accorded them at our store. We make it our business to study the needs of our trade and suit all alike in so far as we are able. If you are an old customer, keep coming, and buy more and more, as every coupon you have increases your chance of securing this Beautiful Bed. If you have never bought anything of us, come and give us a trial now and we'll be glad to serve you and make a lasting friend of you, showing you how to get the best goods on the market and at the same time secure a Beautiful Solid Brass Bed Free without one cent extra expended. Special Noticel DRY GOODS GROCERIES All paying weekly accounts Crepes, China Silks, Messolines, Taffetas, Tango Silks, Flowered Silk Don't forget our general and promptly and those with monthly Crepe-the latest thing in fine Dress Goods-Corded Crepe, Laces, matched in complete line of Groceries. Every- accounts settling up by the 7th, sets-Ready-made Balkans, Shirt Waists, Middies, and in fact everything thing you want to eat and at the will be entitled to coupons.
    [Show full text]
  • National Science Foundation, Washington, DC Directorate
    DOCUMENT RESUME ED 282 723 SE 048 146 TITLE Directory of Awards. FY 1986. INSTITUTION National Science Foundation, Washington, D.C. Directorate for Science and Engineering Education. PUB DATE Apr 87 NOTE 326p. PUB TYPE Reference Materials Directories/Catalogs (132) EDRS PRICE MF01/PC14 Plus Postage. DESCRIPTORS *Awards; *College Science; *Demonstration Programz; Elementary School Science; Elementary Secondary Education; Fellowships; Graduate Study; *Grants; Higher Education; *Science Curriculum; Science Education; *Science Programs; Secondary School Science; Teacher Education IDENTIFIERS *National Science Foundation ABSTRACT The National Science Foundation (NSF) provides awards for education and research in the sciences, mathematics, and engineering. This publication contains information on fiscalyear 1986 awards. An introductory section reviews the goals of NSF's education program and the long-range goals of the Directorate for Science and Engineering Education. Data on fiscal appropriationsare provided and the directorate staff and advisory committeeare identified. An index lists the awards alphabetically by state and specifies the institution, project director, and discipline addressed. Information on each award includes: (1) project director's name; (2) institution;(3) award number; (4) award amount; (5) time duration; (6) discipline area; and (7) project title and abstract. Appendices contain lists of graduate fellowship awards, minority graduate fellowship awards and NATO postdoctoral fellowship awards. (ML) ***********************************************************************
    [Show full text]
  • 1949-1950 Obituary Record of Graduates of Yale University
    BULLETIN OF YALE UNIVERSITY OBITUARY RECORD OF GRADUATES OF THE UNDERGRADUATE SCHOOLS DECEASED DURING THE YEAR I949-I95O SERIES 47 I JANUARY I951 NUMBER I BULLETIN OF YALE UNIVERSITY Entered as second-class matter, August 30, 1906, at the post office at New Haven, Conn., under the Act of Congress of July 16,1894. Acceptance for mailing at the special rate of postage pro- vided for in Section 1103, Act of October 3,1917, authorized August 12,1918. The BULLETIN, which is issued semimonthly, includes: 1. The University Catalogue Number. 2. The Report of the Treasurer Number. 3. The Catalogue Numbers of the several Schools. 4. The Alumni Directory Number. 5. The Obituary Record Number. BULLETIN OF YALE UNIVERSITY OBITUARY RECORD OF GRADUATES OF THE UNDERGRADUATE SCHOOLS DECEASED DURING THE YEAR ENDING JULY i, 1950 INCLUDING THE RECORD OF A FEW WHO DIED PREVIOUSLY, HITHERTO UNREPORTED NUMBER 109 NEW HAVEN 1951 YALE UNIVERSITY OBITUARY RECORD* YALE COLLEGE HENRY MALTZBERGER, B A 1879 Born October 10, 1858, Reading, Pa , died November 21, 1949, Reading, Pa Father, Charles Coleman Maltzberger, a merchant in Reading, son of John Maltzberger Mother, Margaret Catherine (Haas) Maltzberger, daughter of Charles F Haas Hopkins Grammar School Oration appointment Junior and Senior years, Delta Kappa, Delta Kappa Epsilon, and Lmonia Studied law in Reading 1879-81 and lawyer there 1881-1949, U S Commissioner Eastern District of Pennsylvania 1905-29, member Berks County Bar Association and First Reformed Church, Reading Married February 20, 1917, Reading,
    [Show full text]
  • The Recovery and Repatriation of US Missing in Action from the Vietnam
    Comparative Studies in Society and History 2015;57(1):161–190. 0010-4175/14 # Society for the Comparative Study of Society and History 2014 doi:10.1017/S0010417514000632 A Curious Trade: The Recovery and Repatriation of U.S. Missing In Action from the Vietnam War SARAH E. WAGNER Anthropology, George Washington University I was the custodian of this arm…. When I amputated his arm, our medics took [it], took the flesh off it, put it back together perfectly with wires, and then gave it to me. When I left the country six months later, I didn’t want to throw it away. I put it in my trunk and brought it home, and all these years it has been in my house. ———Sam Axelrod, U.S. Army doctor, upon traveling to Vietnam in July 2012 to return the arm bones of a former Vietnamese prisoner patient My arm bone is evidence of my contribution to the war. I will keep it in my house … in the glass display cabinet…. I can’t believe that an American doctor took my infected arm, got rid of the flesh, dried it, took it home and kept it for more than 40 years. ———Nguyen Quang Hung, former Viet Cong soldier upon receiving his arm bones1 Human bones are ambiguous objects, rife with possibilities of care and control, of worship and study, of curation, extraction, and exchange. This article addresses an example of the final phenomenon: the circulation and exchange of a particular type of human remains—namely, those of U.S. service members Missing In Action (MIA) and presumed dead from the Vietnam War.
    [Show full text]
  • March 4, 2021 Mr. Richard Mustico Division of Environmental Remediation New York State Department of Environmental Conservation
    March 4, 2021 Mr. Richard Mustico Division of Environmental Remediation New York State Department of Environmental Conservation 625 Broadway Albany, New York 12233 Re: Revised Geothermal Heat Pump Pilot Study Work Plan 1 Java Street (aka 127-141 West Street and 14-28 India Street), Brooklyn, New York (Tax Block 2538, Tax Lot 1) Dear Mr. Mustico: Roux Environmental Engineering and Geology, D.P.C. (Roux), on behalf of 1 Java Owner LLC (Java LLC), has prepared this Revised Geothermal Heat Pump (GHP) Pilot Study Work Plan (Work Plan) for the property located at 1 Java Street (aka 127-141 West Street and 14-28 India Street) in Greenpoint, Brooklyn, New York (Site). The Site is enrolled in the New York State Department of Environmental Conservation (NYSDEC) Brownfield Cleanup Program (BCP) and is also known as the Greenpoint Ferry Site (BCP Site No. 224272). GHPs are used as an alternative way to reduce energy consumption associated with heating and cooling a building. Java LLC is proposing to complete the GHP Pilot Study discussed herein to evaluate the feasibility of installing a full-scale vertical closed-loop GHP system at the Site during Site redevelopment activities. If this pilot study is effective, a vertical closed-loop GHP field (i.e., geothermal well network) may be installed beneath the Site that would be composed of pipes that run vertically in the ground throughout portions of the Site. A circulating heat-carrying fluid would then be circulated in the closed- loop system piping to absorb or discharge heat from or to the ground depending on the season.
    [Show full text]
  • JOURNAL of the AMERICAN COLLEGE of DENTISTS Vol
    JOURNAL OF THE AMERICAN COLLEGE OF DENTISTS Vol. 9 . DECEMBER, 1942 . No. 4 Contents A Standard Procedure for Determining Abrasion by Dentifrices. Maurice L. Minter, M.D., and Sidney Epstein, D.D.S 353 Concerning the Character of the Age Changes in Enamel and Dentin and Their Relation to the Vital Dental Pulp. Charles F. Bodecker, D.D.S 380 Critical Analysis of Dr. Bodecker's Paper. Wm. J. Gies, Ph.D 390 Dentistry Takes the Initiative. Albert L. Midgley, D.M.D., Sc.D 400 Won't You Walk a Little Faster? Willard C. Fleming, D.D.S 404 American College of Dentists: Proceedings of St. Louis Meeting: Board of Regents and Committee Chairmen, Aug. 27-28, 1942: Reports of Committees: Education. Willard C. Fleming, D.D.S., Chairman 409 Necrology. John V. Conzett, D.D.S., Chairman 412 Preventive Service. L. A. Cadarette, D.D.S., Chairman 416 Report of the Board of Regents. (Including report on Sectional Meetings.) Otto W. Brandhorst, D.D.S., Secretary 418 Meeting of New York and New Jersey Sections: Action Relative to the Journal of Dental Research. Lowrie J. Porter, D.D.S., Secretary, New York Section 433 Journal of Dental Research: William J. Gies Endowment Fund, Report of the Treasurer. Leuman M. Waugh, D.D.S., Treasurer 436 Editorials: Dental Literature, 447; Indium in Dentistry, 448; War, Accidents and the Future, 450; Work But Not for Pay, 452; Foes Within and Foes Without, 453; Journal of Dental Research: William J. Gies Endowment Fund, 453. Erratum 454 Correspondence and Comment: Additional Opinions on the Recent Commercial Exploitation of the Journal of Dental Research 455 Further Comment on "Admiralcy in the Navy Dental Corps" 461 Notes: Dental Research and Commercial Entanglements, 464; Personalities at Dental Meet- ings, 466; Does Yes Mean No?, 467; New Information About the "Harvard Plan", 468; Attendance at U.
    [Show full text]