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- Title
Impacts of irrigation on the deciduous period of teak ( Tectona grandis) in a monsoonal climate.
- Authors
Tanaka, Katsunori; Tanaka, Nobuaki; Matsuo, Naoko; Tantasirin, Chatchai; Suzuki, Masakazu
- Abstract
Leaf phenology in tropical deciduous forests significantly influences water and carbon exchanges between vegetation and the atmosphere. Thus, a comprehensive understanding of the effects of hydrometeorological variables on the growing period is essential for predicting plant water use following climate change. We investigated whether leaf phenology, bud break, and leaf abscission in mature deciduous teak trees ( Tectona grandis L. f.) were induced by the root zone soil moisture content. Using heat pulse velocity and photographic imagery, we compared the deciduous periods (DPs) of two teak trees under natural conditions and two underirrigated conditions. DPs ranged from 47 to 84 days under natural conditions, whereas irrigation shortened the DP by approximately 2 weeks and promoted high levels of water use for 10 months. Thus, the annual water use of irrigated trees far exceeded that of control trees. Under irrigated conditions, leaf abscission and reduced water use were accelerated when the daily mean vapor pressure deficit exceeded 14 hPa following a period of gradual senescence. This study presents preliminary results regarding the impact of irrigation on the teak tree DP. However, uncertainty remains due to insufficient replication; thus, further tests are needed. Nonetheless, our results may predict leaf phenology after short dry periods.
- Subjects
AGRICULTURAL ecology; IRRIGATION; TEAK; DECIDUOUS forests; TROPICAL dry forests; PHENOLOGY; HEAT pulses; SOIL moisture
- Publication
Canadian Journal of Forest Research, 2017, Vol 47, Issue 9, p1193
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/cjfr-2017-0122