Seasonal and Inter-annual Variability of Water Use Efficiency of an Abies holophylla Plantation in Korea National Arboretum

서지정보

· 발행기관 : 한국농림기상학회
· 수록지 정보 : 한국농림기상학회지 / 18권 / 4호 / 366 ~ 377페이지
· 저자명 : 빈두 말라 타쿠리, 강민석, 장용휘, 천정화, 김준

초록

Water use efficiency (WUE) is considered as an important ecological indicator which may provide information on the process-structure relationships associated with energy-matter-information flows in ecosystem. The WUE at ecosystem-level can be defined as the ratio of gross primary productivity (GPP) to evapotranspiration (ET). In this study, KoFlux’s long-term (2007–2015) eddy covariance measurements of CO2 and water vapor fluxes were used to examine the WUE of needle fir plantation in Korea National Arboretum. Our objective is to ascertain the seasonality and inter-annual variability in WUE of this needle fir plantation so that the results may be assimilated into the development of a holistic ecological indicator for resilience assessment. Our results show that the WUE of needle fir plantation is characterized by a concave seasonal pattern with a minimum (1.8 - 3.3 g C⋅(kg H2O)-1) in August and a maximum (5.1 - 11.4 g C⋅(kg H2O)-1) in February. During the growing season (April to October), WUE was on average 3.5±0.3 g C (kg H2O)-1. During the dormant seasons (November to March), WUE showed more variations with a mean of 7.4±1.0 g C⋅(kg H2O)-1. These values are in the upper ranges of WUE reported in the literature for coniferous forests in temperate zone. Although the growing season was defined as the period from April to October, the actual length of the growing season (GSL) varied each year and its variation explained 62% of the inter-annual variability of the growing season WUE. This is the first study to quantify long-term changes in ecosystem-level WUE in Korea and the results can be used to test models, remote-sensing algorithms and resilience of forest ecosystem.

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