Biology 2483A Chapter 22: Nutrient Supply and Cycling
15 Dec 2017
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(cid:120) biogeochemistry is the study of the physical, chemical, and biological factors that influencing the movement and. All organisms have similar nutrient requirements but amounts and specific nutrients vary. Plants = lower nitrogen requirement relative to. Over time (cid:198) well-developed/organic soil, nutrients and clay particles leech down via water. } organic matter (biological) accumulates in top soil horizons mostly dead plants. } mineral nutrients (acids) leached from top soil horizon accumulate in next soil horizon. } clays leach and accumulate in deeper soil horizons. } physical weathering breaks bedrock into ever smaller particles. -- down far enough = parent material. (cid:120) soil properties influence plants availability of nutrients: soil texture determined by particle size. The coarsest particles are sand. (cid:131) make difference in drainage and nutrient holding capacity: clays are the smallest particles (< 2 m). A semicrystalline structure and negative charges on the surface can hold onto nutrients/cations and exchange them with the soil solution.
