The Effect of Temperature and Precipitation on the Intra-Annual Radial Growth of Fokienia hodginsii in Kon Ka Kinh National Park, Viet Nam

By Oanh Nguyen Thi¹ , Nam Le Canh² , Hung Dinh Viet¹ , Tich Vu Van³

¹School of Interdisciplinary Studies, Vietnam National University, Hanoi, VietNam

²Forest Sciences Institute of Central Highlands and South of Central VietNam

³Vietnam National University, Hanoi

Hanoi Geoengineering 2022: - Innovative Geosciences, Circular Economy and Sustainability, 427-436.

or link: /uploads/images/files/Hanoi%20Geoengineering%202022(1).pdf

Abstract:

Fokienia hodginsii ((Dunn) A. Henry et H.H. Thomas) (known locally as Po-mu) is the only living species member of the Fokienia genus, the family name is Cupressaceae. Fokienia, an endemic species to Annamite range, is mainly distributed in the mixed broad-leaved and coniferous forests in the Central Highlands of Vietnam. The objective of this study was to identify the impacts of climatic factors and climate change on the tree ring width of Fokienia in Kon Ka Kinh National Park at the Central Highlands, Viet Nam. The dataset of tree-ring width was collected from 30 sampled trees by using a Haglof increment borer incorporated into the climatic dataset in 57 years (1961-2017) at Pleiku Station. Weighted Linear/Nonlinear methods were applied for modeling regressions of tree-ring width and climatic factors. As a result, Fokienia's annual tree-ring width increment was negative with the average annual temperature and the average monthly temperature of from March to July (except May) and positive with the monthly rainfall (April rainfall and July rainfall). The study also indicated that there was a climate change in the Central Highlands over the past 57 years, the average annual temperature increased approximately by one degree Celsius that made the decrease in the growth of Fokienia.

Keywords: Climate change; tree-ring width; drought.