کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6772964 | 1431821 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Aggregate-associated N and global warming potential of conservation agriculture-based cropping of maize-wheat system in the north-western Indo-Gangetic Plains
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کلمات کلیدی
PNBFDAGWPIGPGHGTSNMBCSOM - WHOMicrobial biomass C - بیوماس میکروبی CIndo-Gangetic plains - دشتهای هند گنگیکDHA - دوکوساهگزائنوئیک اسیدPBB - سازمان ملل متحدSOC - سیستم روی یک تراشهConventional tillage - شخم زدن معمولیGreenhouse gas intensity - شدت گازهای گلخانه ایZero tillage - صفر خاک ورزیDehydrogenase activity - فعالیت دهیدروژنازorganic matter - ماده آلیSoil organic matter - ماده آلی خاکglobal warming potential - پتانسیل گرمایش جهانیSoil organic carbon - کربن آلاینده خاکconservation agriculture - کشاورزی حفاظتیGreenhouse gas - گاز گلخانه ایPlant available nitrogen - گیاه نیتروژن موجود است
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
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چکیده انگلیسی
Despite conservation agriculture (CA) is being promoted as a climate resilient technology, limited information is available on its impacts on N storage within soil aggregates vis a vis global warming potential (GWP) under tropical agro-ecosystems. Hence, this study assessed the effects of a medium-term (5-years) CA on total soil N (TSN) changes in bulk soils and aggregates, N2O and CO2emission, GWP and total C fixed in soils under maize (Zea mays L.)- wheat (Triticum aestivum L.) system on the Indo-Gangetic Plains (IGP). The treatments were: conventional tillage (CT), zero tillage (ZT) with planting on permanent narrow beds (PNB), PNB with residue (PNBâ¯+â¯R), ZT with planting on permanent broad beds (PBB), PBB with residue (PBBâ¯+â¯R), ZT on flat land/plains without crop residue (ZT) and with crop residue retention (ZRâ¯+â¯R). Soil samples were collected after five years of a maize-wheat system and TSN in bulk soils and their aggregates of the 0-5 and 5-15â¯cm soil layers were measured along with N2O and CO2 emissions during the fifth year (2014-15).The soils under PBBâ¯+â¯Rhad 37 and 9% more macro-aggregate-and micro-aggregate-associated N concentrations in topsoil (0-5â¯cm layer) than CT (248 and 299â¯kg N haâ1). However, topsoil soil aggregation and aggregate-associated N contents of PNBâ¯+â¯R and ZTâ¯+â¯R were similar to CT plots. The dehydrogenase and fluorescein diacetate activities and TSN, microbial biomass N, NO3-N and NH4-N concentrations were also highest in PBBâ¯+â¯R plots in topsoil. The topsoil dehydrogenase activity was significantly correlated (râ¯=â¯0.426, nâ¯=â¯21, pâ¯<â¯0.05) with CO2emission and with N2O emission (râ¯=â¯0.770, nâ¯=â¯21, Pâ¯<â¯0.01) during wheat (2014-15). However, topsoil FDA activities and MBN concentrations were only significantly correlated with N2O emission in wheat. In the maize-wheat system, highest N2O emission was observed in PNBâ¯+â¯R plots and least in CT plots. But, PBBâ¯+â¯R and PNBâ¯+â¯R plots had similar CO2 emissions to CT plots in both crops. Despite GWP of ZTâ¯+â¯R and PBBâ¯+â¯R plots in the maize-wheat system were â¼5% higher than CT, greenhouse gas (GHG) intensities in the CT, PBBâ¯+â¯R and ZTâ¯+â¯R plots were similar. Thus, PBBâ¯+â¯R practice is a better management alternative for soil N improvement (and a reduced fertilizer N dose could be adopted in future) than CT since this practice also had 36% and 8.2% higher biomass productivities of maize and wheat, respectively in the maize-wheat cropping system and similar GHG intensity to CT plots.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil and Tillage Research - Volume 182, October 2018, Pages 66-77
Journal: Soil and Tillage Research - Volume 182, October 2018, Pages 66-77
نویسندگان
Ranjan Bhattacharyya, Arti Bhatia, T.K. Das, Sneh Lata, A. Kumar, Ritu Tomer, G. Singh, S. Kumar, A.K. Biswas,