Are greenhouse gas fluxes lower from ley or perennial fallow than from arable organic soils? A systematic review protocol

Table 2 Bibliographic databases that will be used in the literature searches

Database	Search fields	Publisher and URL
Scopus	title, abstract and keywords	Elsevier, https://www.scopus.com/
Web of Science Core Collection¹	topic	Clarivate Analytics, https://clarivate.com/products/web-of-science/
CAB Abstracts	topic	Clarivate Analytics, https://clarivate.com/products/web-of-science/
ProQuest Natural Science Collection²	Abstract and summary text	Proquest, https://www.proquest.com/
Directory of Open Access Journals (DOAJ)	all fields	https://doaj.org/

¹Including Science Citation Index Expanded™, Social Sciences Citation Index®, Arts & Humanities Citation Index®, Emerging Sources Citation Index, Conference Proceedings Citation Index – Science, Conference Proceedings Citation Index—Social Sciences & Humanities
²Including AGRICOLA, Agricultural Science database, Environmental Science database, Environmental Science index, Biological Science database, Biological Science index, Earth, atmosphere & Aquatic Science database

ISSN: 2047-2382