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Chemical and Biological Technologies in Agriculture
Fig. 3 | Chemical and Biological Technologies in Agriculture

Fig. 3

From: Deriving the Shannon Index from the soil molecular Humeome serves as a descriptor of soil organic matter stability under different cropping systems

Fig. 3

Shannon Index (SH) derived from nine molecular classes identified by soil humeomic fractionation applied to soils of the 20 years long-term experiment: uncropped (CONTROL), under continuous Maize cultivation (MAIZE), and under Maize–Broad bean rotation (MIX). AA = amino acids; AM = amines; IM = imines; AD = amides; BA = benzoic acids; BE = benzoic esters; HO = heterocyclic oxygen compounds; PAH = polycyclic aromatic hydrocarbons; PA = phenolic acids; PE = phenolic esters; PH = phenols; FA = fatty acids; DA = dicarboxylic acids; HA = hydroxy acids; ES = aliphatic esters; ET = ethers; KE = ketones; AC = alcohols; AH = aldehydes; AL = alkanes/alkenes/alkynes; RA = resin acids; SE = steroids; ST = sterols; SA = sugar acids; SET = sugar esters; SU = sugars; HN = heterocyclic nitrogen compounds

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