The molecular composition of leaf lipids changes with seasonal gradients in temperature and light among deciduous and evergreen trees in a sub-humid ecosystem

Wang, Zhao; White, Joseph D.; Hockaday, William C.

doi:10.1016/j.orggeochem.2023.104709

Organic Geochemistry

2024

DOI: 10.1016/j.orggeochem.2023.104709

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The molecular composition of leaf lipids changes with seasonal gradients in temperature and light among deciduous and evergreen trees in a sub-humid ecosystem

Zhao Wang,

Joseph D. White,

William C. Hockaday

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2024

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Cited by 2 publications

References 107 publications

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Understory Environmental Conditions Drive Leaf Level‐Lipid Biosynthesis in a Deciduous and Evergreen Tree Species

Wang,

White,

Hockaday

2024

Plant Cell & Environment

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Plants in the understory experience climatic conditions affected by the overstory canopy that influence physiological and biochemical processes. Here, we investigate the relationships of leaf lipid molecular abundances to leaf water content, transmitted irradiance, and free‐air temperature (Tair) from deciduous angiosperm (Quercus buckleyi) and evergreen gymnosperm (Juniperus ashei) understory trees across an elevation gradient in a central Texas (USA) woodland. Monthly sampling from 04/2019 to 01/2020 revealed that long‐chain leaf waxes (≥ C27) accumulated with leaf water deficit over the growing season for both tree species. Higher transmitted light during the hottest, driest months was due to a decreased leaf area index (LAI) in the canopy as leaf shedding is a common drought response. Isoprenoids (sesqui‐, di‐terpenoids, phytosterols) in leaves changed by month with changing LAI and transmittance associated with monthly Tair changes. The chain length of n‐alkanols in Q. buckleyi shifted with seasonal LAI at different topographic positions. The unsaturation of fatty acids in both tree species decreased with increased seasonal Tair but showed topography sensitivity. Leaf‐level metabolites responded to understory microclimatic variables that were influenced by seasonality and topography.

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Understory Environmental Conditions Drive Leaf Level‐Lipid Biosynthesis in a Deciduous and Evergreen Tree Species

Wang,

White,

Hockaday

2024

Plant Cell & Environment

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The Adjusting Effects of Trees on Cfa-Climate Campus Acoustic Environments and Thermal Comforts in the Summer

Lu,

Chen,

Zhou

et al. 2024

Acoustics

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This study explores the effects of trees on the acoustic and thermal environment in addition to people’s responses to trees in different contexts. Through field measurements conducted during the summer of 2023 at the campus of the Southwest University of Science and Technology in Mianyang, residents’ neutral points were locally found to be 52.2 dBA (acoustic) and 23.8 °C (thermal). Further, at their maximum, the trees were able to reduce heat stress by 4 °C (indicated by the physiologically equivalent temperature—PET) and the noise level by 10 dBA (indicated by the A-weighted sound pressure—LAeq); this was achieved by trees with a crown diameter of 20 m. Subjective acoustic and thermal responses varied depending on the context. Acoustically, their neutral LAeq values toward the sounds of traffic, teaching, sports, and daily life were 46.9, 52.5, 51.0, and 52.7 dBA, respectively. Thermally, pedestrians’ neutral PET values were 24.2, 26.1, 22.3, and 25.1 °C, respectively, under the same conditions. These phenomena might be a consequence of the effects of sound frequencies. Future urban forestry research should focus on planting for environmental quality improvement.

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The molecular composition of leaf lipids changes with seasonal gradients in temperature and light among deciduous and evergreen trees in a sub-humid ecosystem

Cited by 2 publications

References 107 publications

Understory Environmental Conditions Drive Leaf Level‐Lipid Biosynthesis in a Deciduous and Evergreen Tree Species

Understory Environmental Conditions Drive Leaf Level‐Lipid Biosynthesis in a Deciduous and Evergreen Tree Species

The Adjusting Effects of Trees on Cfa-Climate Campus Acoustic Environments and Thermal Comforts in the Summer

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