Mostafa Javadian , Russell L. Scott , William Woodgate , Andrew D. Richardson , Matthew P. Dannenberg , William K. Smith
{"title":"树冠温度动态与生态系统从水到能量限制梯度的水供应密切相关","authors":"Mostafa Javadian , Russell L. Scott , William Woodgate , Andrew D. Richardson , Matthew P. Dannenberg , William K. Smith","doi":"10.1016/j.agrformet.2024.110206","DOIUrl":null,"url":null,"abstract":"<div><p>Canopy temperature (T<sub>c</sub>) plays an important role in regulating the rates of mass and energy fluxes at the leaf surface. Better understanding of the relationship between T<sub>c</sub> and water availability may enable more accurate monitoring of ecosystem functioning in a changing climate. Here, we used high spatiotemporal resolution thermal infrared cameras deployed at three eddy covariance flux tower sites along a water- to energy-limited gradient – including a predominately water-limited grassland/shrubland site, a seasonally water-limited evergreen needleleaf forest, and a predominantly energy-limited deciduous broadleaf forest – to determine T<sub>c</sub> seasonality and its relationship with gross primary productivity (GPP) and environmental drivers. We found midday T<sub>c</sub> was generally warmer than air temperature (T<sub>air</sub>) during the growing season (T<sub>c</sub>:T<sub>air</sub> slope: 1.14–1.27) for all sites. Water-limited sites exhibited higher positive T<sub>c</sub> deviations from T<sub>air</sub> (2.30 ± 0.06 °C) compared to the energy-limited site (1.29 ± 0.09 °C) partly due to their reduced latent heat fluxes during water-limited periods. We further found that the T<sub>c</sub>:T<sub>air</sub> slope increased with site aridity, namely for 1.14 slope for the grassland, 1.15 for the evergreen forest, and 1.27 for the broadleaf forest. Peak GPP occurred when T<sub>c</sub> was higher than T<sub>air</sub> across all sites, with peak GPP at the grassland site occurring at +1.1 °C (T<sub>c</sub>-T<sub>air</sub>) and peak GPP at the broadleaf evergreen site occurring at +2.2 °C (T<sub>c</sub>-T<sub>air</sub>). T<sub>c</sub>-T<sub>air</sub> dynamics were mostly associated with soil water content at water-limited sites where canopies undergo a substantial cooling during the transition from dormancy to the peak GPP, while net radiation played a crucial role at the energy-limited site where the canopy heats up compared to T<sub>air</sub> over the same phenological transition. Our findings provide novel insights into T<sub>c</sub>-ecosystem water availability links, highlighting the drivers of T<sub>c</sub>-T<sub>air</sub> across diverse ecosystems in various phenological stages, which has implications for ecosystem management in a changing climate.</p></div>","PeriodicalId":50839,"journal":{"name":"Agricultural and Forest Meteorology","volume":null,"pages":null},"PeriodicalIF":5.6000,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Canopy temperature dynamics are closely aligned with ecosystem water availability across a water- to energy-limited gradient\",\"authors\":\"Mostafa Javadian , Russell L. Scott , William Woodgate , Andrew D. Richardson , Matthew P. Dannenberg , William K. Smith\",\"doi\":\"10.1016/j.agrformet.2024.110206\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Canopy temperature (T<sub>c</sub>) plays an important role in regulating the rates of mass and energy fluxes at the leaf surface. Better understanding of the relationship between T<sub>c</sub> and water availability may enable more accurate monitoring of ecosystem functioning in a changing climate. Here, we used high spatiotemporal resolution thermal infrared cameras deployed at three eddy covariance flux tower sites along a water- to energy-limited gradient – including a predominately water-limited grassland/shrubland site, a seasonally water-limited evergreen needleleaf forest, and a predominantly energy-limited deciduous broadleaf forest – to determine T<sub>c</sub> seasonality and its relationship with gross primary productivity (GPP) and environmental drivers. We found midday T<sub>c</sub> was generally warmer than air temperature (T<sub>air</sub>) during the growing season (T<sub>c</sub>:T<sub>air</sub> slope: 1.14–1.27) for all sites. Water-limited sites exhibited higher positive T<sub>c</sub> deviations from T<sub>air</sub> (2.30 ± 0.06 °C) compared to the energy-limited site (1.29 ± 0.09 °C) partly due to their reduced latent heat fluxes during water-limited periods. We further found that the T<sub>c</sub>:T<sub>air</sub> slope increased with site aridity, namely for 1.14 slope for the grassland, 1.15 for the evergreen forest, and 1.27 for the broadleaf forest. Peak GPP occurred when T<sub>c</sub> was higher than T<sub>air</sub> across all sites, with peak GPP at the grassland site occurring at +1.1 °C (T<sub>c</sub>-T<sub>air</sub>) and peak GPP at the broadleaf evergreen site occurring at +2.2 °C (T<sub>c</sub>-T<sub>air</sub>). T<sub>c</sub>-T<sub>air</sub> dynamics were mostly associated with soil water content at water-limited sites where canopies undergo a substantial cooling during the transition from dormancy to the peak GPP, while net radiation played a crucial role at the energy-limited site where the canopy heats up compared to T<sub>air</sub> over the same phenological transition. Our findings provide novel insights into T<sub>c</sub>-ecosystem water availability links, highlighting the drivers of T<sub>c</sub>-T<sub>air</sub> across diverse ecosystems in various phenological stages, which has implications for ecosystem management in a changing climate.</p></div>\",\"PeriodicalId\":50839,\"journal\":{\"name\":\"Agricultural and Forest Meteorology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.6000,\"publicationDate\":\"2024-08-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Agricultural and Forest Meteorology\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0168192324003198\",\"RegionNum\":1,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"AGRONOMY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Agricultural and Forest Meteorology","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0168192324003198","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRONOMY","Score":null,"Total":0}
Canopy temperature dynamics are closely aligned with ecosystem water availability across a water- to energy-limited gradient
Canopy temperature (Tc) plays an important role in regulating the rates of mass and energy fluxes at the leaf surface. Better understanding of the relationship between Tc and water availability may enable more accurate monitoring of ecosystem functioning in a changing climate. Here, we used high spatiotemporal resolution thermal infrared cameras deployed at three eddy covariance flux tower sites along a water- to energy-limited gradient – including a predominately water-limited grassland/shrubland site, a seasonally water-limited evergreen needleleaf forest, and a predominantly energy-limited deciduous broadleaf forest – to determine Tc seasonality and its relationship with gross primary productivity (GPP) and environmental drivers. We found midday Tc was generally warmer than air temperature (Tair) during the growing season (Tc:Tair slope: 1.14–1.27) for all sites. Water-limited sites exhibited higher positive Tc deviations from Tair (2.30 ± 0.06 °C) compared to the energy-limited site (1.29 ± 0.09 °C) partly due to their reduced latent heat fluxes during water-limited periods. We further found that the Tc:Tair slope increased with site aridity, namely for 1.14 slope for the grassland, 1.15 for the evergreen forest, and 1.27 for the broadleaf forest. Peak GPP occurred when Tc was higher than Tair across all sites, with peak GPP at the grassland site occurring at +1.1 °C (Tc-Tair) and peak GPP at the broadleaf evergreen site occurring at +2.2 °C (Tc-Tair). Tc-Tair dynamics were mostly associated with soil water content at water-limited sites where canopies undergo a substantial cooling during the transition from dormancy to the peak GPP, while net radiation played a crucial role at the energy-limited site where the canopy heats up compared to Tair over the same phenological transition. Our findings provide novel insights into Tc-ecosystem water availability links, highlighting the drivers of Tc-Tair across diverse ecosystems in various phenological stages, which has implications for ecosystem management in a changing climate.
期刊介绍：
Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published.
Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.
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