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Soil Biology & Ecology

Part 2 – 106 | Unit 2.3
Instructor’s Demonstration 2 Outline

placed and capped so you can demonstrate how

to collect a CO 2 sample. Then send teams out to

`œÊ̅iˆÀʜܘÊÃ>“«ˆ˜}]ÊÕȘ}Ê̅iÊ-œˆÊ,iëˆÀ>-

̈œ˜Ê>Ì>Ê-…iiÌÊ­
««i˜`ˆÝÊ{®Ê̜ÊÀiVœÀ`Ê̅iˆÀÊ

measurements.

-iiÊ̅iÊ-œˆÊ,iëˆÀ>̈œ˜Ê/iÃÌÊ­œ˜ˆ˜i®ÊvœÀÊ`iÌ>ˆÃÊ

on how to perform the tests, including preparing

the sample area, inserting the rings in the soil,

preparing the rings for measurement, taking the

measurements, and using the Draeger tubes.

CALCULAT IONS

-œˆÊ,iëˆÀ>̈œ˜Ê­LÊ
" 2 ʇÊ
É>VÀiÉ`>Þ®ÊrÊ

*ÊxÊ/ÊxÊ­ ̄
" 2 ʇÊä°äÎx®Êx 22.91 xÊ

PFÊrÊ«ÀiÃÃÕÀiÊv>V̜ÀÊrÊ£

TFÊrÊÊÌi“«iÀ>ÌÕÀiÊv>V̜ÀÊrʭ܈ÊÌi“«iÀ>ÌÕÀiʈ˜Ê



iÃˆÕÃʳÊÓÇήÊeÊÓÇÎ

HÊrʈ˜Ãˆ`iʅiˆ}…ÌʜvÊÀˆ˜}ÊrÊx°änÊV“Ê­Óʈ˜V…iî

vÊ>ʏ>«Ìœ«ÊˆÃÊ>Û>ˆ>Liʈ˜Ê̅iÊwi]ÊÃÌÕi˜ÌÃÊV>˜Ê
enter the data into a spreadsheet and do these
calculations. Calculators could also be used with
«Àˆ˜ÌiÊëÀi>ÅiiÌÃʈ˜Ê̅iÊwi`°Ê

PREPARATION TIME

£qÓʅœÕÀÃÊ­Û>ÀˆiÃÊ`i«i˜`ˆ˜}ʜ˜Ê܅>Ìʓ>ÌiÀˆ>ÃÊ>ÀiÊ

>Û>ˆ>Li®

DEMONSTRATION TIME

1–1.5 hours

DISCUSSION QUESTIONS

1. Compare soil respiration results for different
   ÈÌiðÊœÜʓ>Þʓ>˜>}i“i˜ÌÊ«À>V̈ViÃʜ˜Ê̅iÊ
   different sites have influenced results?


2. If measurements were made before and after
   wetting soil, compare before and after results.
   œÜÊœiÃÊ܈Ê“œˆÃÌÕÀiʈ˜yÕi˜ViÊLˆœœ}ˆV>Ê activity? Ê Î°Ê7œÕʈÌÊLiÊ«œÃÈLiÊ̜ÊiÃ̈“>ÌiÊ>ÊV>ÀLœ˜Ê
   ˆ“«œÀÌÃÊ>˜`ÊiÝ«œÀÌÃÊ̜Ê>Ê܈ÊiVœÃÞÃÌi“¶Ê7…>ÌÊ
   information would you need to start to make
   such an estimate?

SOURCES OF SUPPLIES

Draeger tubes, latex tubing, hypodermic needles:

ˆÃ…iÀÊ-Vˆi˜ÌˆwV]Ê*ˆÌÌÃLÕÀ}…]Ê*


http://www.fishersci.com

­nää®ÊÇÈȇÇäääÊ

Draeger tubes:

-Vˆi˜ÌˆwVʘ`ÕÃÌÀˆiÃ

ÓÓäÇÊ   ÕiÊ    iÊ
Ûi°Ê   œÕ`iÀ]Ê

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