Journal Issue:
EnNRJ Vol. 9 No. 2

Issued Date

2011

Resource Type

Journal Issue

Language

tha
eng

File Type

application/pdf

Access Rights

open access

Rights

ผลงานนี้เป็นลิขสิทธิ์ของมหาวิทยาลัยมหิดล ขอสงวนไว้สำหรับเพื่อการศึกษาเท่านั้น ต้องอ้างอิงแหล่งที่มา ห้ามดัดแปลงเนื้อหา และห้ามนำไปใช้เพื่อการค้า

Rights Holder(s)

Faculty of Environment and Resource Studies Mahidol University

Journal Volume

No Thumbnail Available
Journal Volume
EnNRJ Volume 9
(2011)

Articles

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PublicationOpen Access
Nymphaea nouchali var. versicolor ‘Bua Phuean’: Seed morphology and germination in vitro
(2011-08) Kitti Bodhipadma; Sompoch Noichinda; Phetcharat Wachirabongkoth; Ekawut Pukpoomin; Luepol Punnakanta; Koravisd Nathalang; Mahidol University. Faculty of Environment and Natural Resource Studies; Mahidol University. Faculty of Science. Department of Biology
Nymphaea nouchali var. versicolor ‘Bua Phuean’ is one of Thai native species of dayblooming waterlily. Since the expansion of community from metropolitan area and the appreciation on exotic species of Nymphaea, number of this plant in environment is noticeably decreased. One of the efficient methods to conserve and increase the amount of this plant is seed germination. Thus, seed morphology and developmental stages of ‘Bua Phuean’ were investigated before germinating in vitro. The results revealed that ‘Bua Phuean’ seeds could be categorized into 5 stages and each stage also had dissimilar morphology. After the stages 3 to 5 seeds were germinated under aseptic condition, seed in stage 5 showed the highest germination rate at 82.22 %. During seed germination, coleoptile emerged from seed coat before root became visible.
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PublicationOpen Access
Improvement of the quality and precision of biomass and carbon equations: case study of mixed-deciduous degraded forest of Thailand
(2011-08) Patthanan Porkar; Wimon Sonchaem; Raywadee Roachanakanan; Rungjarat Hutacharoen; Rungjarat Hutacharoen; Mahidol University. Faculty of Environment and Natural Resource Studies
Environmental pressures brought about by climate change have increased the urgency for biomass assessment to measure the potential of forests to be carbon sinks and carbon sources. The researcher suggests that improving the quality and precision of models used for measuring carbon stock in forests is thus important. This study aims to investigate the relationships between independent factors, such as dry weight biomass (B), and dependent factors, such as diameter at breast height (D), height (H), and wood specific gravity (ρ), to formulate biomass equations for four common tree species: Sterculia pexa; Millettia brandisiana; Grewia eriocarpa; and Bridelia ovata. Regression models, each with different independent variables (D, ρD, D2H, and ρD2H), were studied. The results showed a strong correlation between B, D, and H, but not ρ. However, ρ showed a significant variation between the four species which indicated that proper species identification is required for accurate modelling. The best regression models for estimating biomass had two forms: ln(B) = c + αln(D) and ln(B) = c + αln(ρD2H). The dry weight of individual trees using the regression model with ρD2H had an average estimated error of 0.09–2.66%. The dry weight using D had an average estimated error of 0.28– 1.77%. Thus, it was most appropriate to use ρD2H as the independent variable in the model. Furthermore, linear regression indicated a significant statistical difference between the four species. In conclusion, the researcher found that formulating species-specific regression models is essential in assessing biomass and carbon, particularly for the mixed-deciduous degraded forest areas in this study.

Title

EnNRJ Vol. 9 No. 2

Author's Affiliation

Mahidol University. Faculty of Environment and Resource Studies
มหาวิทยาลัยมหิดล. คณะสิ่งแวดล้อมและทรัพยากรศาสตร์

Keyword(s)

Climate change
 Biodiversity
 Disaster
 Ecological
 Environmental modelling
 Environmental dynamics
 Environmental pollution
 Emerging contaminants
 Transboundary pollution
 Waste and wastewater treatments
 Hazardous wastes
 Natural resource management
 Multidisciplinary sciences
 Environment and Natural Resources Journal

Availability

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EnNRJ-Issue