Izmenjava ogljikovega dioksida skozi krovno tkivo debla

diplomsko delo

Gregor Potrebuješ (Avtor), Boris Turk (Mentor), Mitja Ferlan (Komentor)

Povzetek

V nalogi smo izvedli zaplinjevalni poskus na rastlinah. Zanimala nas je izmenjava ogljikovega dioksida skozi krovno tkivo debla, kar poznamo kot dihanje debla. V deblu rastline je koncentracija CO2 zaradi dihanja in transporta plina iz korenin večja kot pa v ozračju. Ta proces smo skušali izmeriti pri modelni rastlini, navadni krhliki (Frangula alnus). Izbrali smo jo zaradi zgradbe skorje (veliko lenticel) in ker se pojavlja na območju mofet, za katere so značilne visoke talne koncentracije CO2. V lončnem poskusu smo testirali odzivnost dihanja debla na povečanje koncentracije CO2 v tleh, ki smo ga dosegli z zaplinjevanjem. Rastlinam smo iz plinske jeklenke ročno dovajali različne koncentracije CO2. Začeli smo s koncentracijo 2 L/min in nadaljevali s 5 L/min. Tok CO2 iz debla smo merili z merilno napravo Mux Box, ki je beležil spremembo koncentracije z infrardečim plinskim analizatorjem. Najvišje povečanje koncentracije CO2 smo izmerili med zaplinjevanjem s 5 L/min, kar smo tudi pričakovali. Pri poskusu smo naleteli na metodološke težave. Zaradi prekratkega prepihovanja sistema so bile meritve atmosferske koncentracije CO2 napačne. Zato smo se odločili, da vzamemo vrednosti atmosferske koncentracije CO2 iz obdobja pred zaplinjevanjem v istem časovnem obdobju dneva. Iz pridobljenih podatkov smo dokazali, da se po zaplinjevanju poveča izmenjava CO2 iz debla v ozračje.

Ključne besede

fiziologija rastlin;izmenjava plinov;transport plinov;dihanje;ogljikov dioksid;dihanje debla;Frangula alnus;navadna krhlika;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2021
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL BF - Biotehniška fakulteta
Založnik:	[G. Potrebuješ]
UDK:	630*16:581.115(043.2)
COBISS:	76293891
Št. ogledov:	186
Št. prenosov:	26
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Carbon dioxide flux through the cork tissue of a trunk
Sekundarni povzetek:	In the thesis, we performed a fumigation experiment on plants. We were interested in the exchange of carbon dioxide through the cork tissue of the trunk, which we know as trunk respiration. The concentration of CO2 in the trunk of the plant is higher than in the atmosphere due to respiration and transport of gas from the roots. We tried to measure this process in a model plant alder buckthorn (Frangula alnus). We chose this plant because of the structure of the stem (many lenticels) and because it occurs in the area of mofettes, which are characterized by high soil CO2 concentrations. In the experiment, we tested the response of trunk respiration to the increase in CO2 concentration in the soil achieved by fumigation. Different concentrations of CO2 were manually supplied to the plants from a gas cylinder. We started with a concentration of 2 L / min and continued with 5 L / min. The CO2 flow from the trunk was measured with a Mux Box measuring device, which recorded the change in concentration with an infrared gas analyser. The highest increase in CO2 concentration was measured during the fumigation with 5 L/min, what was expected. During the experiment, we encountered methodological problems. Due to unsufficient aeration of the system, while performing the experiment, the measurements of the atmospheric CO2 concentration were incorrect. Therefore, we decided to take the values of atmospheric CO2 concentration from the period before fumigation at the same time period of the day. From the obtained data, we proved that after fumigation, the exchange of CO2 from the trunk to the atmosphere increases.
Sekundarne ključne besede:	plant physiology;gas exchange;gas transport;respiration;carbon dioxide;trunk respiration;alder buckthorn;
Vrsta dela (COBISS):	Diplomsko delo/naloga
Študijski program:	0
Komentar na gradivo:	Univ. v Ljubljani, Biotehniška fak., Oddelek za agronomijo
Strani:	VIII, 30 f.
ID:	13454753