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[1]Zhang Xingyu,Yang Jinyan,Ruan Honghua,et al.Characteristics of Poplar Populus deltoides Stem Sap Flow and Its Response to Environmental Factors Under Simulated Drought[J].Research of Soil and Water Conservation,2024,31(02):84-91.

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Characteristics of Poplar Populus deltoides Stem Sap Flow and Its Response to Environmental Factors Under Simulated Drought

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 02 Page number: 84-91 Column: Public date: 2024-03-20

Title:: Characteristics of Poplar Populus deltoides Stem Sap Flow and Its Response to Environmental Factors Under Simulated Drought

Author(s):: Zhang Xingyu, Yang Jinyan, Ruan Honghua, Zhang Ruiting; (College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China)

Keywords:: drought; sap flow density; soil volumetric water content; thermal diffusion probe

CLC:: S715

DOI:: -

Abstract:: [Objective] The Objectives of this study are to estimate the effects of throughfall exclusion(drought)on the sap flow in a Populus deltoides plantations and to enhance our understanding of the response of poplar plantations to changes in global precipitation patterns. [Methods] The study was conducted from September 2018 to November 2020 in a 10-year old poplar plantation in Dongtai Forest Farm. There were three treatments in this study, including CK(control), D₁(30% throughfall exclusion), and D₂(50% throughfall exclusion ). The sap flow density and environmental factors were continuously measured by thermal diffusion probe technology and the Micro Weather Monitoring System to evaluatethe response of the poplar plantation to environmental factors. [Results](1)In three treatments, the annual variation of sap flow in poplar plantations showed a single peak, similar to the interannual variation of vapor pressure deficit and photosynthetic active radiation. The sap flow rate reached its peak in summer, and then gradually decreased over time. In the dormant period, the sap flow density approached zero.(2)In the drought treatment, the sap flow decreased with the increasing throughfall exclusion. The average sap flow density in the growth seasons of D₁ and D₂ were 39.61 and 31.85 g/(m² s), respectively, which were significantly reduced by 24% to 39% compared to the control(p<0.05).(3)The mixed effect model showed that the vapor pressure deficit and soil temperature were extremely significantly correlated with sap flow(p<0.01), while air temperature, rainfall, and soil temperature were significantly correlated with sap flow(p<0.05). [Conclusion] In D₁ treatment, the power of explanation of environmental factors to sap flow increased, and the sensitivity sap flow to environmental changes could be increased in drought treatments. Among them, soil temperature was significantly correlated with sap flow. Further exploration of the response of tree traits to the environment is needed in the future.

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Last Update: 2024-04-20