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Effects of variable retention harvesting on canopy transpiration in a red pine plantation forest

Ecological Processes 2022年第1期11卷 374-385页

作者： alanna v.bodo M.Altaf Arain School of Earth Environment and SocietyMcMaster University1280 Main Street WestHamiltonON L8S 4K1Canada McMaster Centre for Climate Change McMaster University1280 Main Street WestHamiltonON L8S 4K1Canada

Background:variable Retention Harvesting(vRH)is a forest management practice applied to enhance forest growth,improve biodiversity,preserve ecosystem function and provide economic revenue from harvested *** are many different forms and compositions in which vRH is applied in forest *** this study,the impacts of four different vRH treatments on transpiration were evaluated in an 83-year-old red pine(Pinus Pinus resinosa)plantation forest in the Great Lakes region in *** vRH treatments included 55%aggregated crown retention(55A),55%dispersed crown retention(55D),33%aggregated crown retention(33A),33%dispersed crown retention(33D)and unharvested control(CN)*** vRH treatments were implemented in 1-ha plots in the winter of 2014,while sap flow measurements were conducted from 2018 to ***:Study results showed that tree-level transpiration was highest among trees in the 55D treatment,followed by 33D,55A,33A and CN *** found that photosynthetically active radiation(PAR)and vapor pressure deficit(vPD)were major controls or drivers of transpiration in all vRH *** study suggests that dispersed or distributed retention of 55%basal area(55D)is the ideal forest management technique to enhance transpiration and forest ***:This study will help researchers,forest managers and decision-makers to improve their understanding of water cycling in forest ecosystem and adopt the best forest management regimes to enhance forest growth,health and resiliency to climate change.

关键词： variable Retention Harvesting Forest management Transpiration Sap flow Red pine Great Lakes region

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Radial variations in xylem sap flux in a temperate red pine plantation forest

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Ecological Processes 2021年第1期10卷 328-336页

作者： alanna v.bodo M.Altaf Arain School of Earth Environment and SocietyMcMaster UniversityHamiltonONCanada McMaster Centre for Climate Change HamiltonONCanada

Background:Scaling sap flux measurements to whole-tree water use or stand-level transpiration is often done using measurements conducted at a single point in the sapwood of the tree and has the potential to cause significant *** studies have shown that much of this uncertainty is related to(i)measurement of sapwood area and(ii)variations in sap flow at different depths within the tree ***:This study measured sap flux density at three depth intervals in the sapwood of 88-year-old red pine(Pinus resinosa)trees to more accurately estimate water-use at the tree-and stand-level in a plantation forest near Lake Erie in Southern Ontario,*** showed that most of the water transport(65%)occurred in the outermost sapwood,while only 26%and 9%of water was transported in the middle and innermost depths of sapwood,***:These results suggest that failing to consider radial variations in sap flux density within trees can lead to an overestimation of transpiration by as much as 81%,which may cause large uncertainties in water budgets at the ecosystem and catchment *** study will help to improve our understanding of water use dynamics and reduce uncertainties in sap flow measurements in the temperate pine forest ecosystems in the Great Lakes region and help in protecting these forests in the face of climate change.

关键词： Sap flow Transpiration Water use Red pine Temperate forest Great Lakes region

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财务自由之路

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2017年

作者： (德)博多·舍费尔(bodo Schafer)

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血清肽水平的全基因组测序研究:社区研究的动脉粥样硬化风险

血清肽水平的全基因组测序研究:社区研究的动脉粥样硬化风险

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作者： Paul S.de vries Bing Yu Elena v.Feofanova Ginger A.Metcalf Michael R.Brown Atefeh L.Zeighami Xiaoming Liu Donna M.Muzny Richard A.Gibbs Eric Boerwinkle alanna C.Morrison 张亭 Department of Epidemiology Human Geneticsand Environmental SciencesHuman Genetics CenterSchool of Public HealthThe University of Texas Health Science Center at Houston Human Genome Sequencing Center Baylor College of Medicine

寡肽是由2～20个氨基酸组成的短肽。循环肽的形成多数来自于更大多肽的裂解,因此它们是蛋白质代谢的重要标记物。尽管众肽承担的生物学角色已有文献记载,许多其他的生物学功能仍尚待研究。基因关联研究可能有助于阐明寡肽的起源和功能...

寡肽是由2～20个氨基酸组成的短肽。循环肽的形成多数来自于更大多肽的裂解,因此它们是蛋白质代谢的重要标记物。尽管众肽承担的生物学角色已有文献记载,许多其他的生物学功能仍尚待研究。基因关联研究可能有助于阐明寡肽的起源和功能。在包含1552名欧洲裔美国人和1872名非洲裔美国人的动脉粥样硬化风险的社区研究中,研究者进行了全基因组测序和全外显子测序并检测了血清中25种肽的水平,其中,滑动窗

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