Field Trip

Field Trip

Field trip Report
Mangroves
Contents
Aims
Introduction of the field site –Ting Kok
Analysis of all information(Result and Interpretation)
  A. Physical factors
  B. Dominant species
5.   Improvements
Procedures of field work
  A. Measurement of physical factors
　   There are eight physical factors we need to measure.
    • a. Direction of wind : found by letting a light nylon thread by wind and
                                      using compass, and recorded.
    • b. Speed of wind : found by holding digital anemometer against the
                                  wind
    • c. Temperature and the humidity in the air and under the canopy of
        plants : recorded every 10 minutes at the same position and found
                      by digital thermo-hygrometer, the average was recorded.
    • d. Sediment temperature : at 0m, 6m, 12m, 18m, 24m, 30m and 36m
  point of the transect line was found by the soil thermometer.
    • e. Light intensity inside and outside the mangrove community, also
        above and below the canopy : recorded by the light meter
    •   f. 1Kg of soil sample was obtained with the aid of trowel
    •   g. 2 bottles of water sample :   taken from the sea
    •   h. Slope along the transect   :   was recorded by Abney level
                                                      and supporting frame every several meters

Information of the field site
    • Date of study: 13rd May, 2010 (Thursday)
    • Time of study: 2:30 p.m.
    • Temperature : 25.3℃   (from the Hong Kong observatory)
    • Relative Humidity : 83 - 84 ï¼…
Analysis of the information
Physical Factor analysis:
1. Average Temperature in Mangrove : 24.2℃
2. Relative humidity : 88.3ï¼…
3. Wave Action: Low tide
4. Direction of transect : 260°
5. Average Light Intensity: (a) above canopy: 12200 lux
                                              (b) below canopy:   4133   lux
6. Average Sediment Temperature :...