BIOL462 Lecture Notes - Lecture 9: Bulk Density, Herbaceous Plant, Manganese
6 Jan 2018
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Document Summary
Part 3 wetland and soils, peat and peatland development. 3- field indicator of hydric soils: surface 40cm is saturated for 30 days/yr interact w/ h2o cycle. Surface 40 cm is saturated for at least 30 days/year. Iron and manganese oxide concretion: black or brown. State of decomposition : von post h, color squeeze. Organic matter: 45%-50% is carbon, burn to get inorganic. Bulk density= mass/vol inverse to pore dense: pore v/ vol. 88-97% water, 10% dry matter & 1-7% gas. H1= good /clear/sponge squeeze, no shape ,living , undecomposed. H10= no free water, samples escape hand, completely amorphous *no shape or form( , completely decomposed. * harder to identify living layers at is reaches to 10 (amorphous) 18- paludification : plants more produced than decomposed peat builds up = peat accumulation peatland dev. 19: paludification: peatland formation on less wet mineral lands. Pedogenic processes: decrease in soil permeability (bc more organic material on top and inbetween it)
