Lesson 32 Mineral Cycling - Alaska Geobotany Center

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Relationship between production and N uptake in temperate and boreal forests • Strong linear relationship between N-uptake and total production. From Cole and Rapp (1981)
Litter bags and dowels for measuring decomposition rates Litter bag data containing Andropogon gerardii from Konza Prairie, (Seastedt 1988). Litter bags as part of the LIDET experiment. • Litter bags are mesh bags that allow entry of decomposers. The bags contain a known weight of a plant. • The LIDET (Long-term Intersite Decomposition Experiment Team) is examining long-term Carbon and Nitrogen, and Phosphorus Dynamics of Leaf and Fine Root Litter in North American ecosystems. • The experiment involves 28 sites, 10 types of standard litter (leaves, stems, roots), 10 replicates each, and wide array of biomes, and will last 10 years. • Data above from Konza Prairie shows rapid loss of mass during first 203 days, leaving the more recalcitrant material. The apparent increase in N is due to microbial and fungal additions. Litterbags Wooden dowels placed as part of the LIDET experiment. Photos courtesy of http://www.fsl.orst.edu/lter/research/intersite/lidet/lidet_met h/lidet.htm Litter bags in High Arctic on Banks Island. Photo courtesy of G. Gonzalez
Page 1 and 2: Lesson 32 Mineral Cycling • Essen
Page 3 and 4: Micronutrients
Page 5 and 6: A sedimentary cycle: the phosphorus
Page 7 and 8: Hubbard Brook LTER site: whole wate
Page 9 and 10: Atmospheric inputs of nutrients and
Page 11 and 12: Calcium addition experiment at Hubb
Page 13 and 14: Soil lysimeter to collect water for
Page 15 and 16: Essential plant nutrients • Nutri
Page 17 and 18: Nutrient supply in a coastal dune c
Page 19 and 20: Soil respiration for mixed hardwood
Page 21 and 22: Decomposition of litter material by
Page 23 and 24: Greenhouse Gases Total Greenhouse G
Page 25 and 26: Monitoring Greenhouse Gas Fluxes: F
Page 27 and 28: AmeriFlux Objectives Generally: •
Page 29 and 30: FLUXNET: Integrating worldwide CO 2
Page 31: Carbon and nitrogen cycling in terr
Page 35 and 36: Summary of effects of nitrogen satu
Page 37: Summary (cont ) Measurement of nutr

Lesson 32 Mineral Cycling - Alaska Geobotany Center

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