Lecture 2 Flashcards

Question

Estimating evaporation

Answer 1

Very difficult to measure directly so estimated with mathematical models

Answer 2

Evaporation is often estimated using empirical models based entirely on data observations This is because of the issues with directly measuring of evaporation Models: Predict potential evaporation

Answer 3

Advantages Modest data requirements so ease of use Can work well over long time periods Disadvantages Does not work well over short time periods Can severely underestimate evaporation in arid and semi arid regions

Answer 4

The amount of water in the soil | The ability of the sort to transmit water to the surface

Answer 5

Open water size of water surface, water depth and mixing salinity Bare soils Size, density, orientation and connectivity of pours in the soil, depth to the water table, local heat budgets, pattern of rainfall Vegetated Vegetation high and windspeed, stomatal control, soil factors

Answer 6

Soil water moves so slowly that it’s connected energy is insignificant, and it is its potential energy that is important in determining water movement Potential energy is defined as the work required to transport a quantity of water from a pool of pure water atmospheric pressure to a given soil water location

Answer 7

Build capacity is water retained by a soil once gravitational water has drained out, organic matter enhances field capacity because of its hydrophilic nature, clay soils had four times more water than sandy soils Permanent melting point is the soil water potential at which most plants will it because they can no longer attend water from the soil Plant available water is filled capacity minus permanent wilting point

Answer 8

Plant rooting depth reflects a compromise between water and nutrients availability Most roots near soil surface where nutrients are most available Deep roots tap water from depth

Answer 9

Takes place in soil-plant-atmosphere continuum inter-connected by a continuous thin film of liquid water Driven entirely by physical process of evaporation from leaf surface

Answer 10

Evaporation of water that has passed through plants Occurs at all exposed parts of the plant particularly the stomata They open and close in response to environmental conditions such as light and temperature Opening and closing affect the rate of transpiration and control the flow of water from the plant roots

Answer 11

Evaporative potential of air Water supply from soil Regulation of water loss by leaves using stomata

Answer 12

``` Types of vegetation Season Time of day Stage of growth Meteorological factors Soil properties ```

Lecture 2 Flashcards

(36 cards)