Annual CO2 uptake in the two tropical tree species : Azadirachta indica A. Juss. var. siamensis Valeton and Pterocarpus macrocarpus Kurz

Name: Sureeporn Kerdkankaew

Organization : King Mongkut's University of Technology Thonburi. The Joint Graduate School of Energy and Environment. Environmental Technology

keyword: Photosynthesis

; Planting [Plant culture]

; Neem, Siamese

; Tropical plants

Abstract: The increasing ambient C02 concentration is a serious environmental problemthroughout the world. One of the methods to mitigate this problem is the afforestration.Thus, C02 uptake rates in tropical forests and plantations were investigated. Therefore, thisstudy was conducted to investigate the CO2 uptake rate of two tree species in tropicalplantations: Azadirachta siamensis, the fast-growing tree and Pterocarpus macrocarpus,the slow-growing tree, because these trees are found worldwide and planted throughout thecountry. The objectives of the study were: (1) to examine the ecophysiological variationsin both species; (2) to investigate the relationship between the C02 uptake rate andenvironmental variation, especially PAR and air temperature, because these variations canbe taken from the meteorological station and (3) to evaluate the annual C02 uptake andrelease in both species.The field measurements were conducted during December 1999-2000 at two-monthintervals. A. siamensis were examined in two distinguish clones: clone 64 and 72. Threetrees in each clone of A. siamensis and four trees of P. macrocavus were randomlyselected in each measurement. The parameters were detected at one-hour intervals by theLi-cor 6200 portable photosynthetic system. The measured parameters are PAR, airtemperature, C02 uptake rate, transpiration rate, stomata1 conductance. Water useefficiency (WUE) is the proportion of the CO2 uptake rate to transpiration rate.In December 1999, the La Nifia phenomenon came about in Thailand and the coolerweather had a direct effect on tree physiological variation. The diurnal courses of C02uptake rates in both species followed the patterns of PAR while in the other periods thepeaks of C02 uptake rate occurred in the late morning because of the midday depression.Moreover, the diurnal courses of CO2 uptake rate in both species (P. macrocarpus and A.siamensis) were significantly different only in December 1999 but those in both clones ofA. siamensis (clone No. 64 and No.72) were significantly different only in December 2000.Furthermore, in December 1999 and February 2000, the diurnal courses of A. siamensiswere higher in transpiration rates, stomata1 conductance than P. macrocarpus but lowerWUE. It may be the tree's response to the environmental factors and it implied that thefast-growing tree (A. siamensis) was physiologically less efficient at water use than theslow-growing tree (P. macrocarpus).The relationships of the C02 uptake rates on PAR and air temperature wereinvestigated to develop an empirical mathematical equation. The prediction of C02 uptakefrom empirical equations explained the measured COz uptake for A. siamensis and P.macrocarpus with the explanation of 55% and 67% of variance, respectively. Therefore, itis confirmed that PAR and air temperature are important factors on the CO2 uptake.However, because of the air temperature limitation in P. macrocarpus, its equation can beexplained with the air temperature less than 30 "C.For monthly daytime CO2 uptake, monthly nighttime CO2 release and annual net C02uptake, the calculations for A. siamensis were 34.53-89.27 gC m-2 (1.27-3.27 tC02 ha-'),21.16-26.66 gC m-2 (0.78-0.98 tC02 ha-') and 487.23 gC m-2 (17.87 tC02 ha.'),respectively. The estimations of P. macrocarpus were 34.66-69.05 gC m'2 (1.27-2.53 tC02ha-'), 18.74-24.40 gC m-2 (0.69-0.90 tC02 ha-') and 382.63 gC rn-' (14.03 tC02 ham'),respectively. For comparison of both species, annual C02 uptake in A. siamensis showedto be higher by about 27% than P. macrocarpus.

King Mongkut's University Technology Thonburi. Library

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Pojanie Khummongkol

Role: Advisor

Name: Jesada Luangjame

Role: Advisor

Created: 2003

Issued: 2007-07-16

Modified: 2007-07-26

วิทยานิพนธ์/Thesis

ISBN: 9744563265

CallNumber: JGSEE61

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Environmental Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	JGSEE61.pdf	1.88 MB	13	2018-05-10 18:06:00
2	JGSEE61ab.pdf	39.28 KB	8	2018-05-10 18:06:01
3	JGSEE61ab.txt	4.02 KB	6	2018-05-10 18:06:02

ใช้เวลา

0.038566 วินาที