ENDS 221 Lecture Notes - Lecture 16: Hardpan, Evapotranspiration, Soil Structure
20 Sep 2016
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Document Summary
Infrastructure that works with, not against natural systems: problem with olmstead"s idea: the surrounding areas weren"t ecologically sustainable. In natural forest, most water goes back into the atmosphere via evapotranspiration: when water goes down, some goes into the ground, some across the ground, some goes back up, evapotranspiration: Water coming off the ground(evaporation), or transpiration(water that comes out from the pores of the leaves: chart shows that over the year, there is a difference between rainfall and evapotranspiration. The discrepancy(between the two bars) shows the amount of water that entered the ground/went across the ground. Soils in canada and the northern states of the us are glaciated: map shows the large sheet of ice that was once there(10km, usually have hardpan, often very heavy. Ice weight on top of dirt = tightly packed: 10,000 years since the ice melted land is still rebounding. Compression of soil underneath huge glacier, soil structure is only starting to restructure.
