Biology 2483A Lecture Notes - Lecture 21: Apatite, Plant Litter, Plant Cell

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Some c4 and cam plants require sodium. (all animals require it. : some plants that host n-fixing bacteria require cobalt, some plants in selenium-rich soil require it, but it is toxic to most plants. Plants and microorganisms take up nutrients in simple, soluble forms from the environment. Animals mostly get nutrients in food as large, complex molecules. Soil properties influence availability of nutrients to plants: texture determined by particle size. The coarsest particles: clays are the smallest particles (< 2 m). Ca2+, k+, and mg2+: texture also influences soil water-holding capacity, soils with a high proportion of sand have large spaces between the particles, and do not hold water well. Gough et al. (2000) showed that variation in parent material ph was correlated with plant species richness in arctic ecosystems: climate influences rate of soil development. The properties of carbon compounds influence decomposition rates: lignin strengthens plant cell walls, and is difficult for soil microbes to degrade.

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