Soil organic carbon in managed pastures of the southeastern United States of America

نویسنده

  • Alan J. Franzluebbers
چکیده

Grazing lands in the southeastern United States of America are managed primarily for introduced plant species that have high forage production potential or that fit in a niche within a farming system. Forages are typically managed with fertilization and grazing pressure on a seasonal basis, depending upon growth habit. Nitrogen (N) application is one of the key determinants of pasture productivity, although its effect on soil carbon (C) sequestration may be minimal, especially considering the associated carbon dioxide (CO2) equivalence costs of fertilization. Fertilization with animal manures is effective and may provide additional soil C storage potential, although C may simply be transferred from one ecosystem to another. Moderate grazing of pastures may be the most effective strategy at storing soil organic carbon (SOC) in pastures. Return of dung to the soil surface has positive effects on soil surface properties, including soil microbial biomass and mineralizable C and N. Grazing land managed with a moderate grazing pressure, i.e. utilizing forage to an optimum level without compromising regrowth potential, can provide economic opportunities with low risk for landowners, improve degraded land by building soil fertility, improve water utilization and quality within the landscape, and help mitigate the greenhouse effect by storing C in soil as organic matter. GRAZING LANDS IN THE UNITED STATES OF AMERICA Grazing lands are extensively distributed throughout the United States (Follett, Kimble and Lal, 2001). The United States Department of Agriculture (USDA) Census of Agriculture for 2007 (http://www.agcensus.usda.gov/) Alan J. Franzluebbers

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Achieving Soil Organic Carbon Sequestration with Conservation Agricultural Systems in the Southeastern United States

347 Soil Sci. Soc. Am. J. 74:347–357 Published online 8 Jan. 2010 doi:10.2136/sssaj2009.0079 Received 26 Feb. 2009. *Corresponding author (alan.franzluebbers@ars.usda.gov). © Soil Science Society of America, 677 S. Segoe Rd., Madison WI 53711 USA All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including phot...

متن کامل

Highly productive sown biodiverse pastures with low invasion risk.

Driscoll et al. (1) have recently drawn attention to the risk of new pasture plants becoming invasive, because the same biological traits that promote pasture productivity may also facilitate the invasion of natural areas. The authors indicate some aspects that could mitigate the risk of invasion: namely, the use of native species to develop new pasture plants, the avoidance of new characterist...

متن کامل

Investigating the correlation between vegetation cover, soil elements and plant and soil organic carbon storage in mountain pastures under flooding and grazing (case study: Asadabad Pass, Hamadan)

The extent of rangeland is one of the most important characteristics of organic carbon uptake and storage in soil and plants. The present study investigates the indices of plant diversity and organic carbon storage in mountain pastures under grazing and 10-year enclosure in Asadabad. The rangeland is approximately 100 hectares and its rangelands are in good condition and are in the 2S class in ...

متن کامل

توسعه یک مدل مفهومی بارش- رواناب به منظور شبیه‌سازی رواناب سریع و آهسته (مطالعه موردی: حوضه ناورود)

اگرچه مدل­های متعددی برای بارش-رواناب توسط هیدرولوژیست­ها توسعه داده شده­اند، با این وجود روش­های هیدروگراف واحد در بسیاری از حوضه­ها که در آنجا داده­های هیدرولوژیکی ثبت شده کافی جهت استفاده مدل­های توزیعی بارش-رواناب وجود ندارد هنوز یک ابزار مفید برای تخمین سیلاب می­باشد. هدف از مقاله حاضر استخراج توابع پاسخ پالس واحد رواناب سریع و آهسته جریان آبراهه­ای به روش تحلیلی با استفاده از یک مدل مفهوم...

متن کامل

Comparative life cycle environmental impacts of three beef production strategies in the Upper Midwestern United States

We used ISO-compliant life cycle assessment (LCA) to compare the cumulative energy use, ecological footprint, greenhouse gas emissions and eutrophying emissions associated with models of three beef production strategies as currently practiced in the Upper Midwestern United States. Specifically we examined systems where calves were either: weaned directly to feedlots; weaned to out-of-state whea...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2011