ESS361H1 Lecture Notes - Lecture 5: Concord, New Hampshire, Resistance 2, Water Potential
Document Summary
Involves 4 major mechanics: precipitation, transpiration, evaporation, and condensation. Annual precipitation: most at equator, least at poles. Water output: runoff, transpiration, evaporation, and soil infiltration. Ds = p - et r - i. Ds = change in water storage on land. Ds over long time-scales = 0, therefore p = et + r + i a. Infiltration rate = rainfall rate, which is less than infiltration capacity. Occurs: depends on bulk density and type of soil (texture and porosity) More space, more infiltration: runoff rate = rainfall rate infiltration capacity. Occurs when: infiltration rate of soil is exceeded, so water runs off! Pcanopy = tfall + sflow + eleaf + ldrip. Influence of vegetation on rainfall interception: the larger the canopy, the more interception! The water loss from leaf pores (stomata) as water moves from soil through plant to atmosphere (along gradient) Purpose is to cool leaf surfaces as eergy foes into qe and not qh.
