ENVB 210 Lecture Notes - Lecture 10: Transpiration, Capillary Action, Aquifer
7 Feb 2018
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Water storage: based on small pores + clay + om. Water is measured in kpa (kilopascal) but it is an energy term, not a pressure one. In the soil, water is held more strongly near the particle surface. Hygroscopic water is so close to the particle it is like ice rigid, does not move. (not good for microorganisms) Under -(cid:1005)5(cid:1004)(cid:1004) kpa pla(cid:374)ts ca(cid:374)(cid:374)ot e(cid:454)tract (cid:449)ater fro(cid:373) the particles" surface: it is the per(cid:373)a(cid:374)e(cid:374)t wilti(cid:374)g point. The plant is not dead, will recover if water is added. Pwp depends on the sol texture: air dried sand is almost the same as oven dried sand (not much hygroscopic water) whereas clay holds a fair amount of water when air dried. Wetting: if water encounters a big pore while going up, it will stop. Drying: it takes a lot of time for water to leave the big pore when going down.
