Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.agrformet.2017.08.006 |
The influence of hydrological variability on inherent water use efficiency in forests of contrasting composition, age, and precipitation regimes in the Pacific Northwest | |
Kwon, Hyojung1; Law, Beverly E.1; Thomas, Christoph K.2,3; Johnson, Brittany G.1 | |
通讯作者 | Kwon, Hyojung |
来源期刊 | AGRICULTURAL AND FOREST METEOROLOGY |
ISSN | 0168-1923 |
EISSN | 1873-2240 |
出版年 | 2018 |
卷号 | 249页码:488-500 |
英文摘要 | The Pacific Northwest (PNW) region of the United States has some of the most productive forests in the world. As precipitation regimes may shift with changing climate in this area, droughts are predicted to increase in both frequency and degree of severity, which will have a significant impact on already drought-prone ecosystems. When modeling ecosystem responses to drought, it is important to consider the physiology of individual tree species since the variations in drought sensitivity among species is easily overlooked when plants are characterized using broad plant functional types. Here we explore the use of inherent water-use efficiency as an index of drought sensitivity in semi-arid young and mature ponderosa pine forests and a mesic mature Douglas-fir forest in the PNW. Summer maximum of an evapotranspiration-based WUE (WUE1) was 2.5 times higher in young and mature pines in semi-arid climate than Douglas-fir in mesic climate (12.2 and 11.3 versus 4.7 g C kPa per kg H2O, respectively). In contrast, annually averaged WUE1 was similar among the sites (2.8 g C kPa per kg H2O for pines and 2.4 g C kPa per kg H2O for Douglas-fir). The effect of drought stress on WUE1 was most pronounced in young pine, followed by mature pine and Douglas-fir (32, 11, and 6% increase in WUE1 per % decline in soil water content, respectively) which reflect differences in age-related ecosystem structure (root system, stem capacitance, and soil water holding capacity). Among sites, the responses of WUE1 to climate variability were largely driven by changes in evapotranspiration (ET) compared to gross primary productivity (GPP). However, in areas where evaporation is the primary component of ET, such as the open canopy ponderosa forests of the PNW, the contribution of soil processes to ET can overshadow the reaction of vegetation transpiration (T) to changes in water availability. In these cases, utilizing a transpiration-based WUE (WUELT) in vegetation models will yield a more accurate representation of plant activity during drought. These results highlight the importance of incorporating differences in species- and age-related WUE1 in models in diverse forest types at regional and global scales to improve predictions in ecosystem responses to climate change. |
英文关键词 | Water use efficiency Drought Climate and age gradients Pacific Northwest |
类型 | Article |
语种 | 英语 |
国家 | USA ; Germany |
收录类别 | SCI-E |
WOS记录号 | WOS:000424180100040 |
WOS关键词 | DOUGLAS-FIR FOREST ; CARBON EXCHANGE ; PONDEROSA PINE ; INTERANNUAL VARIATION ; BRITISH-COLUMBIA ; ECOSYSTEM WATER ; TREE MORTALITY ; XYLEM EMBOLISM ; GAS-EXCHANGE ; SOIL-WATER |
WOS类目 | Agronomy ; Forestry ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Agriculture ; Forestry ; Meteorology & Atmospheric Sciences |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/207307 |
作者单位 | 1.Oregon State Univ, Dept Forest Ecosyst & Soc, Corvallis, OR 97331 USA; 2.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA; 3.Univ Bayreuth, Micrometeorol Grp, D-95440 Bayreuth, Germany |
推荐引用方式 GB/T 7714 | Kwon, Hyojung,Law, Beverly E.,Thomas, Christoph K.,et al. The influence of hydrological variability on inherent water use efficiency in forests of contrasting composition, age, and precipitation regimes in the Pacific Northwest[J],2018,249:488-500. |
APA | Kwon, Hyojung,Law, Beverly E.,Thomas, Christoph K.,&Johnson, Brittany G..(2018).The influence of hydrological variability on inherent water use efficiency in forests of contrasting composition, age, and precipitation regimes in the Pacific Northwest.AGRICULTURAL AND FOREST METEOROLOGY,249,488-500. |
MLA | Kwon, Hyojung,et al."The influence of hydrological variability on inherent water use efficiency in forests of contrasting composition, age, and precipitation regimes in the Pacific Northwest".AGRICULTURAL AND FOREST METEOROLOGY 249(2018):488-500. |
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