Improving, Restoring, and Conserving Soil Organic Matter in Grasslands

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Grassland and Pasture Science".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 4764

Special Issue Editor


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Guest Editor
School of Applied Sciences and Technology, Prudence College Dublin GSustain and University College Dublin, Belfield, Dublin 4, Ireland
Interests: soil biogeochemistry; carbon sequestration; nutrient management; greenhouse gases; modelling; carbon footprint; environmental sustainability; climate change
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Special Issue Information

The Paris Agreement prioritizes climate policy and research agendas to keep the temperature increase to well below 2°C. Compared to the atmosphere, soils as a storehouse of 2–3 times more organic carbon, which is the measurable constituent of soil organic matter (SOM), could play a pivotal role. Various biotic and abiotic factors, including organic materials as inputs and plant–soil feedbacks, are the major drivers of SOM build-up that maintains soil quality, productivity, and environmental resilience. Grasslands (e.g., pasture, silage, hay, integrated/mixed farming, and pastoralism) dominate major agricultural areas, contributing >30% to the soil organic carbon (SOC) pools to become a natural climate solution. Diverse agro-climatic regions with low-input pastoral to highly intensive production systems in optimizing management practices for carbon sequestration remain a big challenge. The impact of grassland type, biodiversity, erosion/degradation, and land use change on SOC pools is enormous, showing either sink or source, and may deteriorate further under climate change. This Special Issue seeks high-quality articles (original, review, case study, methodology, and modelling) to improve knowledge-base, identify research gaps, and understand region/biome-specific management practices/technologies to increase, restore, and conserve SOM/SOC in grassland systems while achieving productivity, socio-economic benefits, and environmental sustainability, and offsetting/trading-off greenhouse gases.

Dr. Mohammad Ibrahim Khalil
Guest Editor

Manuscript Submission Information

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Keywords

  • carbon sequestration
  • degradation
  • recovery
  • conservation
  • management practices
  • climate change
  • trade-off/offset
  • grassland systems

Published Papers (1 paper)

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Review

15 pages, 2855 KiB  
Review
Delineate Soil Characteristics and Carbon Pools in Grassland Compared to Native Forestland of India: A Meta-Analysis
by Rajeev Padbhushan, Sheetal Sharma, D. S. Rana, Upendra Kumar, Anshuman Kohli and Rajkishore Kumar
Agronomy 2020, 10(12), 1969; https://doi.org/10.3390/agronomy10121969 - 15 Dec 2020
Cited by 7 | Viewed by 2421
Abstract
Grassland is a highly dynamic land use system and it provides vital ecosystem services, mainly consisting of carbon storage in the tropics and subtropics. The objective of this study was to delineate grassland in India according to soil characteristics and carbon pools in [...] Read more.
Grassland is a highly dynamic land use system and it provides vital ecosystem services, mainly consisting of carbon storage in the tropics and subtropics. The objective of this study was to delineate grassland in India according to soil characteristics and carbon pools in comparison to native forestland, and to discuss management strategies for improving soil carbon (SC) storage in grassland. A total of 675 paired datasets from studies on grassland and forestland in India generated during the period of 1990–2019 were used for meta-analysis study. The analysis shows that soil pH and bulk density (BD) in grasslands were greater by 1.1% and 1.0% compared to forestlands while soil organic carbon (SOC) declined by 36.3% (p < 0.05). Among carbon pools, labile carbon (LC), non-labile carbon (NLC), and microbial biomass carbon (MBC) were 35.5%, 35.3% and 29.5% lower, respectively, in the grassland compared to the forestland. Total carbon (TC) was 35.0% lower in the grassland than the forestland (p < 0.05). Soil carbon stocks (SCS) were 32.8% lower in the grassland compared to the forestland. In the grassland, MBC/SOC (%) from the surface layer and subsurface layer were lower by 2.4% and 8.5%, respectively compared to forestland. The percentage effect size was found to have decreased from surface soil to subsurface soil. Relative SCS loss and carbon dioxide equivalent emission from the grassland compared to forestland were 15.2% and 33.3 Mg ha−1, respectively (p < 0.05). Proper management strategies like agroforestry, legume introduction, silvipastoral system, fertilization, irrigation, and quality grass species could improve SC storage and reduce SCS loss in grassland. Overall, this study gives an idea that conversion of native forestland into grassland in India has declined the SC content and hence it is necessary to adapt proper strategies to manage the soil-atmosphere carbon balance. Full article
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