ENVS 3010 Chapter Notes - Chapter 3.2: Semipermeable Membrane, Snow Removal
21 Jul 2016
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Methods for studying the impact of climatic change. Indoor chambers can be used to manipulate co2 concentrations. Can also be used to control temp. and relative humidity, soil moisture and fertility. With a sufficient sample size one may be able to detect reasonably small effects of co2: have low external validity. Indoor chambers vary in construction and what they are capable of controlling. Simple growth cabinets (low end of scale: usually only have 2-4. Problematic because it is difficult to mimic natural light: small number of replicates. Chambers (middle of scale: cheaper to construct, higher replication levels, co2, temp. , and light are more difficult to control. Unless invested in an expensive control system. Ecotron (high end of scale: large, walk-in chambers, 16 identical chambers for replication, very expensive to build and operate. Indoor chambers offer very good control, but they lack external validity, and due to expenses they have poor replication: outdoor chambers.
