کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4379649 1617661 2016 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High quality residues from cover crops favor changes in microbial community and enhance C and N sequestration
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
High quality residues from cover crops favor changes in microbial community and enhance C and N sequestration
چکیده انگلیسی


• Vetch cover crop led to more Gram + bacteria.
• Vetch–sorghum rotation had the highest Shannon–Weaver diversity index.
• Vetch–sorghum had highest microbial biomass and N mineralization.
• Vetch–sorghum sequestered more C and N in stable SOM fractions.

The objective of the study was to evaluate the effect of a change in management on the soil microbial community and C sequestration. We conducted a 3-year field study in La Pampa (Argentina) with rotation of sorghum (Sorghum bicolor) in zero tillage alternating with rye (Secale cereale) and vetch (Vicia villosa ssp. dasycarpa). Soil was sampled once a year at two depths. Soil organic matter fractions, dissolved organic matter, microbial biomass (MBC) and community composition (DNA extraction, qPCR, and phospholipid FAME profiles) were determined. Litter, aerial- and root biomass were collected and all material was analyzed for C and N. Results showed a rapid response of microbial biomass to a bacterial dominance independent of residue quality. Vetch had the highest diversity index, while the fertilized treatment had the lowest one. Vetch–sorghum rotation with high N mineralization rates and diverse microbial community sequestered more C and N in stable soil organic matter fractions than no-till sorghum alone or with rye, which had lower N turnover rates. These results reaffirm the importance of enhanced soil biodiversity for maintaining soil ecosystem functioning and services. The supply of high amounts of N-rich residues as provided by grass–legume cover crops could fulfill this objective.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Global Ecology and Conservation - Volume 6, April 2016, Pages 242–256
نویسندگان
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