Biology 2483A Lecture Notes - Lecture 21: Decomposer, Chlorophyll, Nitrogenase
30 Jan 2018
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Unit 6: ecosystems lesson 21: nutrient supply and cycling (nov. 23rd 2017) Beginning of chloroplasts, changed the atmosphere, added oxygen. Freeze thaw and drying rewetting cycles break rocks into smaller pieces: rocks break down into big boulders gravel sand silt clay. Vernal pools hold water due to having a clay base holding onto water particles. Water drains through sand and silt easily. For a river, detrital sources from the edges of the river give energy: plant roots and gravity, chemical weathering chemical reactions release soluble forms of the mineral elements, soil properties influence nutrient availability. Soils with a high proportion of sand have large spaces between the particles and do not hold water well. Texture influences soil water holding capacity: parent material rock or mineral material that was broken down by weathering to form a soil. Lower ph reduces availability of n and p to plants. Low ph lower diversity in animals and plants in that area.
