کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8962300 | 1646556 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High carbon storage in a previously degraded subtropical soil under no-tillage with legume cover crops
ترجمه فارسی عنوان
ذخیره سازی کربن بالا در یک خاک زیر زمین گرمسیری که قبلا تخریب شده بود تحت هیچ خاک ورزی با محصولات با پوشش گیاه حبوبات
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کلمات کلیدی
تداخل کربن، عمق خاک، حفاظت کشاورزی، سیستم برداشت، کاهش تغییرات اقلیمی،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
چکیده انگلیسی
The effect of no-tillage (NT) on soil organic carbon (SOC) storage may help Brazil meet its 37% greenhouse gas emissions reduction target by 2025. When combined with legume cover crops, NT could result in even greater SOC storage than NT alone. The objective of this study was to evaluate the SOC storage potential of NT and the contribution of legume cover crops and nitrogen (N) fertilization to this potential in both the surface and subsurface soil layers of a previously degraded subtropical Acrisol of Southern Brazil. Using a split-plot design, the long-term field experiment compared the effect of NT and conventional tillage (CT), with or without legume cover crops, and with or without mineral N fertilization. Thirty years of contrasting management systems resulted in large differences (up to 35âMgâhaâ1) in SOC stocks in the whole soil profile (0-100âcm). The combination that provided the greatest increase in SOC was NT combined with two legume cover crops and N fertilization (1.15âMgâhaâ1âyearâ1 compared to CT, with no N fertilization or legume cover crop). Legume cover crops were twice as efficient in storing SOC as N fertilization, with 1âkg of residue input being converted to 0.15âkg of SOC. Overall, the variation in SOC stocks was explained largely by plant carbon input (R2â=â80%) which varied with N fertilization and cropping system. About half of the SOC storage that occurred in this 30-year-old NT system was attributable to the increase in SOC stocks in the subsurface layer (30-100âcm), which was confirmed by the contribution of C3 cover crop residues using carbon isotope signature (from 14.8 to â¼17.5â° in the 75-100âcm layer). Thus, the legume cover crop made a strong contribution to the potential of SOC storage in NT, and high rates of C storage occurred over a longer period in subsurface soil layers than previously believed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agriculture, Ecosystems & Environment - Volume 268, 1 December 2018, Pages 15-23
Journal: Agriculture, Ecosystems & Environment - Volume 268, 1 December 2018, Pages 15-23
نویسندگان
Murilo G. Veloso, Denis A. Angers, Tales Tiecher, Sandro Giacomini, Jeferson Dieckow, Cimélio Bayer,