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[1]LI Manle,FAN Yaqian,WANG Ke,et al.Seasonal Dynamics in Light and Water Use Efficiency of a Typical Shrub Spiraea salicifolia in Understory and Its Response to Environmental Factors in Songshan of Beijing[J].Research of Soil and Water Conservation,2023,30(03):301-309.[doi:10.13869/j.cnki.rswc.2023.03.001]

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Seasonal Dynamics in Light and Water Use Efficiency of a Typical Shrub Spiraea salicifolia in Understory and Its Response to Environmental Factors in Songshan of Beijing

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 301-309 Column: Public date: 2023-04-10

Title:: Seasonal Dynamics in Light and Water Use Efficiency of a Typical Shrub Spiraea salicifolia in Understory and Its Response to Environmental Factors in Songshan of Beijing

Author(s):: LI Manle^1,2, FAN Yaqian³, WANG Ke³, JIANG Yan^1,2, LI Xinhao^1,2, TIAN Yun^1,2, LI Rundong⁴, XU Mingze^1,2, HAO Shaorong^1,2, ZHA Tianshan^1,2; (1.School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 2.Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 3.Beijing Songshan National Nature Reserve Administration, Beijing 102100, China; 4.Shanghai Investigation, Design & Research Institute Co., Ltd., Shanghai 200335, China)

Keywords:: Spiraea salicifolia; light use efficiency; water use efficiency; environmental factors

CLC:: Q948

DOI:: 10.13869/j.cnki.rswc.2023.03.001

Abstract:: [Objective]Resource use efficiencies are key indicators for acclimation of a plant to environmental conditions, which is one of the main concerns in the area of climate change ecology. The controlling machanisms of light use efficiency(LUE)and water use efficiency(WUE)of understory shrub species in response to environmental changes remain unclear. [Methods] The seasonal variation in LUE and WUE and its envrionmental controls for an understory shrub, Spiraea salicifolia, in a typical deciduous forest in Songshan of Beijing were examined through in-situ measurements of leaf photosynthetic parameters and environmental factors in the full leafing stage from June to September 2019. [Results] LUE and WUE showed obvious seasonal variations, averaging 0.03 mol/mol and 8.32 μmol/mmol, respectively. Photosynthetically active radiation(PAR)and air temperature(T_a)were the main factors controlling the LUE, showing an exponential and a linear negative relationship, respectively. PAR and vapor preassure difference(VPD)were the main factors controlling WUE, with which both showed the linear negative relationship. The VPD limited transpiration by affecting stomatal conductance(g_s), which affected WUE. The seasonal variation in both LUE and WUE was not affected by soil water content(SWC). There was convergency between LUE and WUE in response to environmental factors. [Conclusion] PAR, T_a and VPD, rather than SWC, were the main limiting factors for resource use efficiencies of the shrub Spiraea salicifolia in understory of the research area. The shrub Spiraea salicifolia in understory showed a resource conservation strategy under the condition of limited resources, specifically, under the condition of limited light, the shrub Spiraea salicifolia in understory maximized the use of light energy for photosynthesis and thus had a high light energy utilization efficiency.

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Last Update: 2023-04-10