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CO 2 emission from mineral soils following land‐cover change in Brazil
Author(s) -
Bernoux Martial,
Da ConceiçÃo Maria,
Carvalho Santana,
Volkoff Boris,
Cerri Carlos Clemente
Publication year - 2001
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1046/j.1354-1013.2001.00446.x
Subject(s) - environmental science , greenhouse gas , soil water , vegetation (pathology) , land use , land use, land use change and forestry , forestry , land cover , agriculture , hydrology (agriculture) , physical geography , geography , atmospheric sciences , environmental protection , soil science , ecology , geology , medicine , geotechnical engineering , archaeology , pathology , biology
This paper presents a first approximation of net CO 2 fluxes from mineral soil due to land use, land‐use changes and forestry (LULUCF) activities in Brazil for the periods 1970–90 and 1975–95. The methodology employed is an adaptation of the approach proposed by the IPCC in ‘Revised 1996 guidelines for national greenhouse gas inventories’, which is based on the variations in soil C stocks as a function of changes in land‐use activities. The calculation was done separately for each Brazilian state and subsequently summarized for all of Brazil. The annual fluxes for Brazil indicate a net emission of CO 2 to the atmosphere, which decreased from 93.3 Tg CO 2 for the period 1970–90 to 46.4 Tg CO 2 for the period 1975–95. This corresponded to yearly net emission rates of 11.0 g CO 2 m −2 year −1 for the 1970–90 period and 5.5 g CO 2 m −2 year −1 for the 1975–95 period. Within each administrative region, considerable differences in the yearly emission rates between the states could be observed. Several sources of uncertainties could be identified. The most important uncertainties were linked to the impact factor values, which represent changes in native C stock associated with conversion of the native vegetation to agricultural use.