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

作　　者：Alanna V.Bodo M.Altaf Arain 

机构地区：[1]School of Earth,Environment and Society,McMaster University,1280 Main Street West,Hamilton,ON L8S 4K1,Canada [2]McMaster Centre for Climate Change,McMaster University,1280 Main Street West,Hamilton,ON L8S 4K1,Canada

出　　处：《Ecological Processes》2022年第1期374-385,共12页生态过程（英文）

基　　金：This study was funded by the Natural Sciences and Engineering Research Council(NSREC),the Global Water Futures Program(GWF),and the Ontario Ministry of Environment,Conservation and Parks(MOECP)grants.

摘　　要：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 timber.There are many different forms and compositions in which VRH is applied in forest ecosystems.In 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 Canada.These 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)plot.These VRH treatments were implemented in 1-ha plots in the winter of 2014,while sap flow measurements were conducted from 2018 to 2020.Results:Study results showed that tree-level transpiration was highest among trees in the 55D treatment,followed by 33D,55A,33A and CN plots.We found that photosynthetically active radiation(PAR)and vapor pressure deficit(VPD)were major controls or drivers of transpiration in all VRH treatments.Our study suggests that dispersed or distributed retention of 55%basal area(55D)is the ideal forest management technique to enhance transpiration and forest growth.Conclusions: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 

分 类 号：S71[农业科学—林学]