کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11024793 | 1701069 | 2019 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Changes in soil carbon stocks after land-use change from native vegetation to pastures in the Atlantic forest region of Brazil
ترجمه فارسی عنوان
تغییرات در ذخایر کربن خاک پس از تغییر کاربری زمین از گیاه بومی به مراتع در منطقه جنگل اقیانوس اطلس برزیل
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
Millions of hectares (ha) of the Atlantic forest of Brazil have been deforested and replaced by pastures, quite a large proportion of this in the last 60â¯years. There have been few studies on the impact of this land-use change on stocks of soil organic matter (SOM) only one study reported the state of vigour of the pastures. The aim of this study was to estimate the overall change in SOM stocks 16â¯years after the removal of forest vegetation in this biome in southern Bahia and the installation of pastures of Brachiaria brizantha fertilized with N and maintained under controlled grazing. Soil samples were taken for evaluation of density and texture and for analyses of C and N total and 13C abundance to a depth of 100â¯cm at 100â¯m intervals along four transects of 400â¯m from the pastures into the forest. Grazing was found not to have any significant effect on soil density (compaction). The live weight gain of the Nellore cattle on both cultivars of B. brizantha, fertilized with 120â¯kgâ¯Nâ¯haâ1â¯yrâ1 as urea during 12â¯years, was close to 500â¯kgâ¯haâ1â¯yrâ1. The gain in soil C was similar under the two grass cultivars, being approximately 15â¯Mgâ¯Câ¯haâ1 to a depth of 30â¯cm and 20â¯Mgâ¯Câ¯haâ1 to 100â¯cm. The 13C abundance data showed that the large gain in soil C was due to the slow decomposition of the forest-derived C (total loss 12.6â¯Mgâ¯Câ¯haâ1 over 16â¯years) and the large accumulation of C derived from the Brachiaria (total gain 43.2â¯Mgâ¯Câ¯haâ1). These results confirm the potential of productive Brachiaria pastures to accumulate soil C in a tropical climate with year-round rainfall.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 337, 1 March 2019, Pages 394-401
Journal: Geoderma - Volume 337, 1 March 2019, Pages 394-401
نویسندگان
Camila A. dos Santos, Claudia de P. Rezende, Ãrika F. Machado Pinheiro, José M. Pereira, Bruno J.R. Alves, Segundo Urquiaga, Robert M. Boddey,