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Emission of Nitrogen Gas, Nitrous Oxide, and Carbon Dioxide on Rehydration of Dry Feathermosses

Dep. of Renewable Resources, Faculty of Agric. Forestry and Home Econ., Univ. of Alberta, Edmonton, AB, Canada, T6G 2H1

View larger version (22K): [in this window] [in a new window]   Fig. 1. Locations of the moss collection sites. Samples were collected in July 2000.

View larger version (16K): [in this window] [in a new window]   Fig. 2. Emission of N2 and N2O from the moss tissue that remained continuously moist or from mosses that were dried and rewetted (expressed in mg N per kg of the dry moss tissue). The treatments are: C, control (continuously moist); F, fertilized moss (continuously moist); D, moss dried before the experiment; FD, moss fertilized and dried before the experiment (n = 12). Error bars indicate 1 SE.

View larger version (15K): [in this window] [in a new window]   Fig. 3. Emission of CO2 from moss tissue subjected to fertilization and/or a single drying/rewetting cycle (expressed in kg/kg of the dry moss tissue, after 20 h of incubation). Treatments are: C, control (continuously moist); F, fertilized moss (continuously moist); D, moss dried before the experiment; FD, moss fertilized and dried before the experiment (n = 12). Error bars indicate 1 SE.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Loss of mass of fertilized and unfertilized feathermoss over repeated dry–wet cycles. Weight of the moss samples after each drying was compared with the initial air-dry weight (i.e., the first drying time), and the weight differences were estimated as a fraction of the initial weight. Error bars indicate 1 SE.

View larger version (19K): [in this window] [in a new window]   Fig. 5. Sugar and starch concentrations in the moss tissue after five repeated dry–wet cycles. Treatments are: C, control (not subjected to dry–wet cycles); F, fertilized moss (not subjected to dry–wet cycles); D, subjected to five dry–wet cycles; FD, moss fertilized and subjected to five dry–wet cycles (n = 12). Error bars indicate 1 SE.