EARTHSC 2C03 Lecture Notes - Lecture 7: Gypsum, Electrical Resistance And Conductance, Hydraulic Conductivity
15 Feb 2017
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Document Summary
Soil moisture is a major controlling factor on ground heat flux. It greatly influences soil thermal properties such as cs and ks. Soil temperature, ground heat flux, soil vapour transport, surface evaporation are all linked in the soil-atmosphere environment. Soil temperature plays a critical role in the planetary energy balance and ultimately influences all biosphere processes i. e. biogeochemical cycling, photosynthesis etc. Dry bulk density ( bd): the ratio of the weight of dry solids to total volume of the soil (kg m-3). Porosity (p): total volume occupied by pores (i. e. water and air filled) per unit volume of soil. Where ms is mass of solids (kg), va, vw, vt are air, water and total volume (m3). Soil moisture is mainly defined in two ways: (1) volumetric soil moisture: Total volume of water per unit volume of soil (m3/m3, thus dimensionless). It can also be expressed as percentage (%). Where vw, vt are water and total volume (m3).
