Canopy Temperature Is Regulated by Ecosystem Structural Traits and Captures the Ecohydrologic Dynamics of a Semiarid Mixed Conifer Forest Site

Javadian, Mostafa; Smith, William K.; Lee, Kangsan; Knowles, John F.; Scott, Russell L.; Fisher, Joshua B.; Moore, David J. P.; Leeuwen, Willem J. D. van; Barron‐Gafford, Greg A.; Behrangi, Ali

doi:10.1029/2021jg006617

Cited by 13 publications

(19 citation statements)

References 75 publications

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“…García-Tejero et al ( 2018) and Pou et al (2014) conducted studies on almonds and grapevines, respectively, using thermography and observed that plants subjected to water restriction conditions had higher T canopy . However, variations in meteorological variables can also directly influence the T canopy data (Javadian et al, 2022).…”

Section: Resultsmentioning

confidence: 99%

Evaluation of crop water status of melon plants in tropical semi-arid climate using thermal imaging

Aragão

Neto

Viana

et al. 2023

Rev. bras. eng. agríc. ambient.

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The objective of this study was to analyze the feasibility of using thermal images to estimate the water status of melon plants (Cucumis melo L.) in tropical semi-arid climates. The study was conducted in a randomized block design with a split-plot arrangement. The plots comprised of soil cover (with and without mulching), and subplots were constructed using five irrigation regimes (120, 100, 80, 60, and 40% crop evapotranspiration), with five replicates. The following variables were evaluated: canopy temperature (Tcanopy), leaf water potential, air temperature (Tair), soil moisture, crop yield, and thermal index (ΔT), which is defined as the difference between Tcanopy and Tair. ΔT exhibited high correlations with crop yield and water consumption, indicating that thermography is an efficient tool for identifying the water status of melon plants, which could be employed for proper irrigation scheduling under tropical semi-arid scenarios. Moreover, thermal images identified the beneficial effects of soil cover on leaf water status and crop yield, primarily under moderate deficit irrigation. These results demonstrate that mulching is essential for increasing melon yield and water productivity in tropical regions.

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Section: Resultsmentioning

confidence: 99%

Evaluation of crop water status of melon plants in tropical semi-arid climate using thermal imaging

Aragão

Neto

Viana

et al. 2023

Rev. bras. eng. agríc. ambient.

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“…7). Such observations are also consistent with many previous findings respectively made using EC (Duman et al ., 2021; Javadian et al ., 2022), proximate remote sensing (Still et al ., 2021; Yang et al ., 2021), and satellite (Lian et al ., 2017; Duveiller et al ., 2018) measurements. The widespread presence of ∆ T variability further suggests that the conventional approach of using T a alone for inferring T c could produce large uncertainty.…”

Section: Discussionmentioning

confidence: 99%

“…This can be caused by the effect of canopy structure (e.g. self‐shading and canopy gaps) and microclimate, but has not been explored comprehensively (Pau et al ., 2018; Javadian et al ., 2022). Thus, it is reasonable to expect that there are scale‐dependent mechanisms in regulating plant thermoregulation capability.…”

Section: Discussionmentioning

confidence: 99%

Does plant ecosystem thermoregulation occur? An extratropical assessment at different spatial and temporal scales

et al. 2022

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Summary To what degree plant ecosystems thermoregulate their canopy temperature (Tc) is critical to assess ecosystems' metabolisms and resilience with climate change, but remains controversial, with opinions from no to moderate thermoregulation capability. With global datasets of Tc, air temperature (Ta), and other environmental and biotic variables from FLUXNET and satellites, we tested the ‘limited homeothermy’ hypothesis (indicated by Tc & Ta regression slope < 1 or Tc < Ta around midday) across global extratropics, including temporal and spatial dimensions. Across daily to weekly and monthly timescales, over 80% of sites/ecosystems have slopes ≥1 or Tc > Ta around midday, rejecting the above hypothesis. For those sites unsupporting the hypothesis, their Tc–Ta difference (ΔT) exhibits considerable seasonality that shows negative, partial correlations with leaf area index, implying a certain degree of thermoregulation capability. Spatially, site‐mean ΔT exhibits larger variations than the slope indicator, suggesting ΔT is a more sensitive indicator for detecting thermoregulatory differences across biomes. Furthermore, this large spatial‐wide ΔT variation (0–6°C) is primarily explained by environmental variables (38%) and secondarily by biotic factors (15%). These results demonstrate diverse thermoregulation patterns across global extratropics, with most ecosystems negating the ‘limited homeothermy’ hypothesis, but their thermoregulation still occurs, implying that slope < 1 or Tc < Ta are not necessary conditions for plant thermoregulation.

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“…UAV-borne thermal sensors might possess the ability to detect increase in subdegree temperature caused by stress or disease progression at tree-level [25]. Additionally, thermal sensors also help in assessing water stress in vegetation [29]. RGB sensors have been used to measure vegetation height as well as to compute Normalized Green Red Difference Index (NGRDI), visible atmospherically resistant index (VARI), and Green Leaf Indices (GLIx) [30,31].…”

Section: Need For Low-cost Uav-based Monitoring Systemsmentioning

confidence: 99%

UAVs for monitoring responses of regenerating forests under increasing climate change-driven droughts - a review

Luber¹,

Vidhya²,

Jaafar

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The impact of climate change-driven droughts on regenerating forests is poorly understood due to the complexities involved in regeneration processes and the difficulties in measuring the relevant parameters with sufficient spatial and temporal resolution in a timely manner. Drought increases tree mortality in both undisturbed and disturbed forests and may influence forest regeneration dynamics from seed germination to the recruitment, growth, and survival of tree seedlings. Seedlings and small saplings may be more susceptible to changes in water availability than larger individuals due to their shallower roots that may be unable to reach the deeper, moist soil layers, and due to uneven competition with adult trees for soil moisture. The potential range shifts and local extinction of drought-sensitive species can also result in changes in forest species community composition and diversity loss at different scales. There is a need for precise and low-cost monitoring systems that facilitate better capturing of the complexities of such processes for restoration measures. The objective of this paper is to study the use of UAVs (Unmanned Aerial Vehicles) for monitoring responses of regenerating forests under increasing climate change-driven droughts. UAVs have several advantages over traditional field-based monitoring techniques and flexibility in selecting the required spatiotemporal resolution over other remote sensing methods, making them a promising tool for monitoring forest recovery. Although further research is required to ensure the accuracy and effectiveness of UAV-facilitated measures for monitoring forest regeneration, UAVs possess great potential in forest management in the event of increasing occurrences of climate-change driven droughts.

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Canopy Temperature Is Regulated by Ecosystem Structural Traits and Captures the Ecohydrologic Dynamics of a Semiarid Mixed Conifer Forest Site

Cited by 13 publications

References 75 publications

Evaluation of crop water status of melon plants in tropical semi-arid climate using thermal imaging

Evaluation of crop water status of melon plants in tropical semi-arid climate using thermal imaging

Does plant ecosystem thermoregulation occur? An extratropical assessment at different spatial and temporal scales

UAVs for monitoring responses of regenerating forests under increasing climate change-driven droughts - a review

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