Another way to collect a stool sample is to loosely place plastic wrap across the rim of the toilet, under the seat. Then place the stool sample in a clean, sealable container before taking to the laboratory. Plastic wrap can also be used to line the diaper of an infant or toddler who is not yet using the toilet. The stool should be collected into clean, dry plastic jars with screw-cap lids.
change, and (2) climate change conditions derived from regional climate parameters projected by the. GISS general circulation model combined with a CO2 concentration of 550 ppm. The 1971 to 1995. period was simulated under neutral conditions with the purpose of defining soil conditions for 1996. It. was found that in the event of a change in climate, physical proporties would change to a lesser degree. than chemical properties. The soil bulk density would decrease by 8% with respect to the baseline sce-. nario in soils under nsk of erosion.
Basically, the answer is that climate and nutrients control primary productivity. Areas that are warm and wet generally are more productive (see Figures 6a and 6b). Overall, the amount of water available limits land primary production on our world, in part due to the large areas of desert found on certain continents.fter the costs of respiration, plant net primary production is reduced to 4.95 x 106 cal m-2 yr- 1, or about 0.05% of the solar constant. Note that this is the average efficiency, and in land plants this value can reach ~2-3% and in aquatic systems this value can reach ~1%.