Black Carbon in Soils: Relevance, Analysis, Distribution

摘要

Black carbon (BC). a graphrtic. particulate form of carbon that results from the incomplete cfflnbustion of otgmpnaisnai, to a significant part ot.the scnI organiccarbpn (SOC) insoil worldwide. "This article gives an overview on the sources and thebehavior of soil BC, discusses the different-anytical approaehde for. and reviews iiterature on tts distnbution in soils. Black carbon is released by biomass and fossil fuel burning in the form of soot and char and charcoal. It is ulsiquttotis in the atmosphere and m soils, in soils. BC is more persistent and less reactive than other SOC constituents. It has turnover penods ranging from some decades to some thousands of years. statilty. together with chemical and phical features such as high surface area and porosity, has important implications for nutnent storage, contaminant adsorpitlon. and bulk SOC Stability, as well as for global chemicalate ehane mrtigatidn Biochar BC production and storage in soils are discussed as very promising carbon sequestration strategies. Because BC includes a continuum of materials, a wide array of analytical sipproaches has been developed for its investigation, including optical, chemical, and thermal methods. This makes it difficult to cortipare" different studies and to draw a big picture of BC distribution. Black carbori assessment iq soil survey would be valuable from a use and management perspective, might help identify the factors and processes affecting BC in soils, and possibly pitovide an important clue m understanding the global carbon cycle.