[Agren & Andersson 2012] Accumulation of litter and particular decomposed plant parts on top of the mineral soil. Often sub-divided into litter (S, L and F) and humus (H) horizons. This horizon consists mostly of organic matter. In forest soils, this horizon is often called forest floor

Terphenyls with a structure containing the 1,2-diphenylbenzene skeleton.

Glucuronides in which the aglycone is linked to the carbohydrate unit through an O-glycosidic bond.

Aromatic compounds containing a toluene, which carries a carboxamide group a the 2-position.

Phenols that are substituted with an amine group at the 2-position of the benzene ring.

Iodophenols carrying a iodine at the C2 position of the benzene ring.

Organic compounds containing an acetamide group conjugated to a phenyl group, which is in turn ortho-substituted with a halogen atom.

Organic compounds containing a benzene ring conjugated to a methylidene group and a ketone at carbon atoms 1 and 2, respectively.

O-quinones that carry an imine group.

Bromophenols carrying a iodine at the C2 position of the benzene ring.

Quinonimines in which the imine groups are in a ortho-relationship.

Hydroxylamines that are O-substituted with a phenyl group.

Organic compounds containing a glycerone that carries an acyl substituent at the 1-position or the 2-position.

Aromatic compounds that contain a o-xylenol moiety, which is a monocyclic benzene carrying exactly two methyl groups at the 1- and 2-positions, and at least one hydroxyl group.

Quinones where the two C=O groups are attached at the 1- and 2-positions, respectively.

Chlorophenols carrying a iodine at the C2 position of the benzene ring.

Benzoquinones where the two C=O groups are attached at the 1- and 2-positions, respectively.

Fluorophenols carrying a iodine at the C2 position of the benzene ring.

Compounds containing a pyrimidine , which is O-alkylated at one or more ring positions.

Aromatic compound containing a benzene ring which carries 2 amino groups, at the 1- and 2-positions.

Aromatic compounds that contain a o-xylene moiety, which is a monocyclic benzene carrying exactly two methyl groups at the 1- and 2-positions.

Compounds containing a benzene ring conjugated to two methylidene groups at carbon atoms 1 and 2, respectively.

O-ester derivatives of thiocarbamic acid, with the general formula ROC(=S)NR2.

Glycosides of o-coumaric acids. O-coumaric acids are aromatic compounds containing a cinnamic acid moiety hydroxylated at the C2 carbon atom of the benzene ring.

Iridoid monoterpenes containing a glycosyl (usually a pyranosyl) moiety linked to the iridoid skeleton.

Organic acids with the general formula RCO-SH (R=H, organic group).

O-ester derivatives of dithiophosphates, with the general structure RSP(O)(O)=S (R = organyl group).

Flavones with methoxy groups attached to the C2' atom of the isoflavone backbone.

Aurone flavonoids containing a carbohydrate moiety O-glycosidically bound to the aurone skeleton.

Organic acids with the general formula RS(=S)(=S)OH.

Phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to glucuronic acid.

Compounds containing a carbohydrate moiety which is O-glycosidically linked to the 2-phenylchromen-4-one flavonoid backbone.

Flavonoids with methoxy groups conjugated to the flavonoid backbone.

Isoflavonoids with methoxy groups conjugated to the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

O-glycoside derivatives of cinnamic acid. Cinnamic acid is an aromatic compound containing a benzene and a carboxylic acid group forming 3-phenylprop-2-enoic acid.

Cyclic organosulfur compounds with the general structure RC(=S)OR', R-R' = organyl group, where the central atom is part of the ring.

Ester derivatives of o-phthalic acids, which are based on a benzene 1,2-dicarboxylic acid skeleton.

Isoflavones with methoxy groups attached to the C4' atom of the isoflavone backbone.

Glycerolipids containing a glycerol moiety that carries an alkyl group at the 1-position.

Ester derivatives of carbothioic O-acids, with the general structure ROC(=S)R' where R = organyl group and R' = H or organyl group.

Organic compounds containing a benzene ring fused to a 1,2-dioxin ring.

Benzoic acids which bear a sulfanyl group (R-SH) attached to the benzene ring at positions 1 and 2, respectively.

O-glycosylated derivatives of isoflavonoids, which are natural products derived from 3-phenylchromen-4-one.

Glycoside in which a sugar group is bonded through one carbon to another group via a O-glycosidic bond.

Compounds containing a carbohydrate moiety glycosidically linked to the rotenoid backbone at the C8-position.

Glycerone-3-phosphates carrying an alkyl substituent at the 1-position.

Isoflavones with methoxy groups attached to the C7 atom of the isoflavone backbone.

Organic acids with the general formula RS(S)(=NH2)-OH (R=H, organic group).

Organic compounds with the general formula HOS(R)(=N)(=S) (R = alkyl, aryl).

Organosulfur compounds with the general formula RS(O)(S)-OH.

Glycerone-3-phosphates carrying an acyl substituent at the 1-position.

Isoflavonoids with methoxy groups attached to the C4' atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Flavonoids with methoxy groups attached to the C3' atom of the flavonoid backbone.

Isoflavonoids with methoxy groups attached to the C6 atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Flavonoids with methoxy groups attached to the C5 atom of the flavonoid backbone.

Organooxygen compounds containing a O-ester derivative of phosphoroamidothioic acid. They have the general structure ROP(=O)(S)(NH2), where R is an organyl group.

5-O-glycosylated neoflavonoids. Neoflavonoids are compounds with a structure based on the 4-phenylchromene backbone.

Phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to glucuronic acid at the C8-position.

Flavonoids with methoxy groups attached to the C4' atom of the flavonoid backbone.

Phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to carbohydrate moiety at the C3-position.

Benzofurans that a O-glycosylated at the 2-position. Benzofurans are organic compounds containing a benzene ring fused to a furan.

Sulfonic acids with the general formula R-N-OS(O)(=O)=O. They can be synthesized through reaction of hydroxylamine and chlorosulfonic acids.

Phenolic compounds containing one anthocyanidin moiety which is O-glycosidically linked to a carbohydrate moiety at the C5-position.

Phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to glucuronic acid at the C3-position.

Phenolic compounds containing one anthocyanidin moiety which is O-glycosidically linked to a carbohydrate moiety at the C4'-position.

Flavonoids with methoxy groups attached to the C2 atom of the flavonoid backbone.

Isoflavonoids with methoxy groups attached to the C7 atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Flavonoids with methoxy groups attached to the C6 atom of the flavonoid backbone.

Isoflavonoids with methoxy groups attached to the C8 atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Flavonoids with methoxy groups attached to the C7 atom of the flavonoid backbone.

Phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to carbohydrate moiety at the C7-position.

Isoflavonoids with methoxy groups attached to the C3 atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Flavonoids with methoxy groups attached to the C8 atom of the flavonoid backbone.

Isoflavonoids with methoxy groups attached to the C4 atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Isoflavonoids with methoxy groups attached to the C3' atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Flavonoids with methoxy groups attached to the C2' atom of the flavonoid backbone.

Organic compounds containing a n-nitroso group -ON=O.

Phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to carbohydrate moiety at the C8-position.

Phenolic compounds containing one anthocyanidin moiety which is O-glycosidically linked to a carbohydrate moiety at the C3-position.

Phenolic compounds containing one anthocyanidin moiety which is O-glycosidically linked to a carbohydrate moiety at the C3'-position.

7-O-glycosylated neoflavonoids. Neoflavonoids are compounds with a structure based on the 4-phenylchromene backbone.

Isoflavonoids with methoxy groups attached to the C2' atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Organooxygen compounds that contain a phosphorodithioic acid, which is O-monosubstituted by an organyl group.

Isoflavonoids with methoxy groups attached to the C2 atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Phenolic compounds containing one anthocyanidin moiety which is O-glycosidically linked to a carbohydrate moiety at the C7-position.

Benzofurans that a O-glycosylated at the 2-position. Benzofurans are organic compounds containing a benzene ring fused to a furan.

Hydroxylamines that are O-substituted with a phenyl group, and N-substituted by an alkyl group.

Flavonoids with methoxy groups attached to the C3 atom of the flavonoid backbone.

Flavonoids with methoxy groups attached to the C4 atom of the flavonoid backbone.

Phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to glucuronic acid at the C7-position.

Isoflavonoids with methoxy groups attached to the C5 atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Benzoic acid esters where the benzene ring is ortho-substituted with a hydroxy group.

Compounds containing a benzene ring bearing a carboxylic acid group at ring carbon atoms 1 and 3.

Organooxygen compounds containing a O,S-diester derivative of phosphoroamidothioic acid. They have the general structure RSP(=O)(OR')(NH2), where R,R' are organyl groups.

Benzoic acids in which the hydrogen atom at position 2 of the benzene ring is replaced by a methoxy group.

Glycerolipids containing a chiral glycerol moiety that carries an alkyl group at the 1-position.

Compounds containing a galloic acid moiety, linked to one hydroxyl group of a quinic acid moiety.

Compounds containing a O-glycosylated chalcone or dihydrochalcone moiety.

Benzoic acids (or derivatives) which bear a sulfanyl group (R-SH) attached to the benzene ring at positions 1 and 2, respectively.

Flavonoid 3p-O-glycosides where the carbohydrate moiety is esterified with a p-coumaric acid. P-coumaric acid is an organic derivative of cinnamic acid, that carries a hydroxyl group at the 4-position of the benzene ring.

Anthocyanidin 3-O-glycosides where the carbohydrate moiety is esterified with a p-coumaric acid. P-coumaric acid is an organic derivative of cinnamic acid, that carries a hydroxyl group at the 4-position of the benzene ring.

Anthocyanidin 3p-O-glycosides where the carbohydrate moiety is esterified with a p-coumaric acid. P-coumaric acid is an organic derivative of cinnamic acid, that carries a hydroxyl group at the 4-position of the benzene ring.

Number concentration means number of molecule per unit volume, and is used in the construction molecular_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical formula for o-tolualdehyde is C8H8O. O-tolualdehyde is a member of the group of aldehydes. The IUPAC name for o-tolualdehyde is 2-methylbenzaldehyde.

Mass concentration means mass per unit volume and is used in the construction mass_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical formula for o-cresol is C7H8O. O-cresol is a member of the group of alcohols. The IUPAC name for o-cresol is 2-methylphenol.

Mass concentration means mass per unit volume and is used in the construction mass_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chmical formula for o-cresol is C7H8O. It belongs to the group of aromatics. The IUPAC name is 2-methylphenol

Number concentration means number of molecule per unit volume, and is used in the construction molecular_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chmical formula for o-cresol is C7H8O. It belongs to the group of aromatics. The IUPAC name is 2-methylphenol

Number concentration means number of molecule per unit volume, and is used in the construction molecular_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical formula for o-cresol is C7H8O. O-cresol is a member of the group of alcohols. The IUPAC name for o-cresol is 2-methylphenol.

Mass concentration means mass per unit volume and is used in the construction mass_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical formula for o-xylene is C8H10. O-xylene is a member of the group of hydrocarbons known as aromatics. The IUPAC name for o-xylene is 1,2-xylene.

Number concentration means number of molecule per unit volume, and is used in the construction molecular_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical formula for o-xylene is C8H10. O-xylene is a member of the group of hydrocarbons known as aromatics. The IUPAC name for o-xylene is 1,2-xylene.

Mass concentration means mass per unit volume and is used in the construction mass_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical formula for o-tolualdehyde is C8H8O. O-tolualdehyde is a member of the group of aldehydes. The IUPAC name for o-tolualdehyde is 2-methylbenzaldehyde.

Amount fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. The chemical formula for o-cresol is C7H8O. O-cresol is a member of the group of alcohols. The IUPAC name for o-cresol is 2-methylphenol.

Amount fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. The chmical formula for o-cresol is C7H8O. It belongs to the group of aromatics. The IUPAC name is 2-methylphenol

Amount fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. The chemical formula for o-tolualdehyde is C8H8O. O-tolualdehyde is a member of the group of aldehydes. The IUPAC name for o-tolualdehyde is 2-methylbenzaldehyde.

Amount fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. The chemical formula for o-xylene is C8H10. O-xylene is a member of the group of hydrocarbons known as aromatics. The IUPAC name for 1,2-xylene.