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DOI | 10.3389/ffgc.2024.1352853 |
Evapotranspiration and its partitioning during and following a mountain pine beetle infestation of a lodgepole pine stand in the interior of British Columbia, Canada | |
Hao, Shaorong; Jia, Xin; Zhao, Hongxian; Li, Xinhao; Mu, Yanmei; Zha, Tianshan; Liu, Peng; Bourque, Charles P. -A. | |
发表日期 | 2024 |
EISSN | 2624-893X |
起始页码 | 7 |
卷号 | 7 |
英文摘要 | Introduction Massive tree mortality events in western Canada due to widespread infestation by mountain pine beetle (MPB) are expected to impact local-to-regional evapotranspiration (ET) dynamics during and after a disturbance. How ecosystem-level ET and its components may vary with canopy-tree mortality (treefall) and subsequent understory recovery remains unclear.Methods We used 10 years of continuous eddy-covariance and remote-sensing data (2007-2016) and machine-learning models based on random forest and xgboost to determine forest- and climate-driven effects at temporal scales appropriate for a lodgepole pine-dominated stand following a major, five-year MPB disturbance initiated in the summer of 2006.Results Total annual ET over the 10 years ranged from 207.2 to 384.6 mm, with annual plant transpiration (T) contributing to 57 +/- 5.4% (mean +/- standard deviation) of annual ET. Annual ET initially declined (2007-2011) and then increased (2011-2016), with ET and T/ET increasing at statistically non-significant rates of approximately 3.2 and 1.2% per year from 2007 to 2016. Air temperature (Ta) and vapor pressure deficit (VPD) were the most important predictors of seasonal variation in ET and T/ET during the 10-year period, with high Ta, VPD, and photosynthetically active radiation (PAR) causing ET and T/ET to increase. Annual ET increased with both increasing spring Ta and decreasing VPD. Annual T/ET was shown to increase with increasing VPD and decrease with increasing volumetric soil water content at a 5-cm depth (VWC5). Enhanced vegetation index (EVI, an indicator of canopy greenness) lagged T and overstory tree mortality, whereas previous- and current-year values of EVI were shown to be poor predictors of annual ET and T/ET.Discussion and conclusions These findings suggest that the promotion of climate factors on forest ecosystem-level water vapor fluxes may offset reductions promoted by MPB outbreaks. Climate processes affected water vapor fluxes more than biotic factors, like stand greenness, highlighting the need to include climate-regulatory mechanisms in predictive models of ET dynamics during and subsequent to stand disturbance. Climate and forest-greenness effects on water vapor fluxes need to be explored at even longer time scales, e.g., at decadal scales, to capture long-drawn-out trends associated with stand disturbance and its subsequent recovery. |
英文关键词 | climate change; evapotranspiration partitioning; evergreen needle forest; forest disturbance; mountain pine beetle; vegetation greenness index |
语种 | 英语 |
WOS研究方向 | Environmental Sciences & Ecology ; Forestry |
WOS类目 | Ecology ; Forestry |
WOS记录号 | WOS:001174130400001 |
来源期刊 | FRONTIERS IN FORESTS AND GLOBAL CHANGE |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/306035 |
作者单位 | Beijing Forestry University; University of New Brunswick; Beijing Forestry University; Beijing Forestry University |
推荐引用方式 GB/T 7714 | Hao, Shaorong,Jia, Xin,Zhao, Hongxian,et al. Evapotranspiration and its partitioning during and following a mountain pine beetle infestation of a lodgepole pine stand in the interior of British Columbia, Canada[J],2024,7. |
APA | Hao, Shaorong.,Jia, Xin.,Zhao, Hongxian.,Li, Xinhao.,Mu, Yanmei.,...&Bourque, Charles P. -A..(2024).Evapotranspiration and its partitioning during and following a mountain pine beetle infestation of a lodgepole pine stand in the interior of British Columbia, Canada.FRONTIERS IN FORESTS AND GLOBAL CHANGE,7. |
MLA | Hao, Shaorong,et al."Evapotranspiration and its partitioning during and following a mountain pine beetle infestation of a lodgepole pine stand in the interior of British Columbia, Canada".FRONTIERS IN FORESTS AND GLOBAL CHANGE 7(2024). |
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