A global examination of the response of ecosystem water-use efficiency to drought based on MODIS data

Huang, Ling; He, Bin; Han, Le; Liu, Junjie; Wang, Haiyan; Chen, Ziyue

doi:10.1016/j.scitotenv.2017.05.084

Cited by 134 publications

(64 citation statements)

References 44 publications

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“…To verify the effectiveness of the WUE estimated in the TNR from the GLASS products, the WUE calculated by the GLASS GPP and ET was compared with the WUE calculated by the MODIS GPP and ET, which are widely used remote sensing products [10,11,52]. The annual GPP (MOD17A3) and ET (MOD16A3) data with a 1 km resolution from 2000 to 2014 were produced by the Numerical Terra Dynamic Simulation Group (http://www.ntsg.umt.edu) and are freely available.…”

Section: Modis Productsmentioning

confidence: 99%

“…The flux measurements from sites showed that the response of the WUE to drought across global ecosystems corresponded well with the climatic zones [14]. The Moderate Resolution Imaging Spectroradiometer (MODIS) GPP and ET products are some of the most widely used remote sensing data in studies of ecosystem WUE [10,23]. The effects of meteorological drivers on the global patterns of WUE were nonmonotonic based on the MODIS GPP and ET data over the period from 2000 to 2013 [23].…”

Section: Introductionmentioning

confidence: 98%

“…The ecosystem water use efficiency (WUE) is defined as the ratio of the gross primary productivity (GPP) to the evapotranspiration (ET) [9][10][11] and is one of the indicators that comprehensively reflects ecological sustainable development [12]. WUE is often used to explore the resilience of vegetation ecosystems to drought [13,14], as it is a key parameter that measures the exchange between the carbon gain and water loss of terrestrial ecosystems [15].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Climate Factors and Human Activities on the Ecosystem Water Use Efficiency throughout Northern China

Zhao

Zhou

et al. 2019

Remote Sensing

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Global climate changes have increased the imbalance of water resources, especially in northern China, which comprises typical arid and semiarid regions. Large-scale afforestation has been implemented over the past three decades in northern China. The ecosystem water use efficiency (WUE) connects the carbon cycle and water cycle of the terrestrial ecosystems and is defined as the ratio of the gross primary productivity (GPP) to the evapotranspiration. However, there are still an insufficient number of studies on the impact of the afforestation on the WUE. In this study, we applied the random forest (RF) model to explore the impacts of climate and nonclimate factors on the WUE in northern China. The results showed that in areas with high precipitation, the forests had the highest WUE, while in the arid areas, the croplands had the highest WUE. Of the total area, 44.34% showed a significant increase, and 5.89% showed a significant decrease in the WUE from 1982–2015 in northern China. The main driving factors for the changes in the WUE were climate factors, including the precipitation, temperature and solar radiation, which contributed to approximately 84% of the WUE trends, while human activities, such as afforestation, contributed to approximately 16% of the WUE trends. Overall, although the climate had a larger impact on the WUE dynamics than the human activities, our results suggested that the impacts of the afforestation programs on forest carbon and water cycles should be considered in the context of climate change.

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Section: Modis Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Effects of Climate Factors and Human Activities on the Ecosystem Water Use Efficiency throughout Northern China

Zhao

Zhou

et al. 2019

Remote Sensing

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“…Earlier studies showed an increase in WUE over the last decades in response to growing CO 2 concentrations, due to reduced stomatal conductance to maintain the intercellular CO 2 concentration at a constant level (Yu et al, 2008;Pe-uelas et al, 2011;Keenan et al, 2013). WUE for arid ecosystems showed a negative response to drought, whereas WUE for humid ecosystems showed both positive and negative responses to drought (Huang et al, 2017). A recent study by Limousin et al (2015) partly contradicts this paradigm, demonstrating that a convergence in WUE response to drought exists in plant species with different tolerances to drought.…”

Section: Introductionmentioning

confidence: 95%

Ecophysiological Responses to Rainfall Variability in Grassland and Forests Along a Latitudinal Gradient in Italy

Conte

Fares

Salvati

et al. 2019

Front. For. Glob. Change

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In the Mediterranean region, ecosystems are severely affected by climate variability. The Italian Peninsula is a hot spot for biodiversity thanks to its heterogeneous landscape and the Mediterranean, Continental, and Alpine climates hosting a broad range of plant functional types along a limited latitudinal range from 40 ′ to 46 ′ N. In this study we applied a comparative approach integrating descriptive statistics, time series analysis, and multivariate techniques to answer the following questions: (i) do the climatic variables affect Gross Primary Productivity (GPP), Reco, Water Use Efficiency (WUE), and ET to a similar extent among different sites? (ii) Does a common response pattern exist among ecosystems along a latitudinal gradient in Italy? And, finally (iii) do these ecosystems respond synchronically to meteorological conditions or does a delayed response exist? Six sites along a latitudinal, altitudinal, and vegetational gradient from semi-arid (southern Italy), to a mountainous Mediterranean site (central Italy), and sub-humid wet Alpine sites (northern Italy) were considered. For each site, carbon and water fluxes, and meteorological data collected during two hydrologically-contrasting years (i.e., a dry and a wet year) were analyzed. Principal Component Analysis (PCA) was adopted to identify temporal and spatial variations in GPP, Ecosystem Respiration (Reco), WUE, and Evapotranspiration (ET). The model outlined differences among Mediterranean semi-arid, Mediterranean mountainous, and Alpine sites in response to contrasting precipitation regimes. GPP, Reco, WUE, and ET increased up to 16, 19, 25, and 28%, respectively in semi-arid Mediterranean sites and up to 15, 32, 15, and 11%, respectively in Alpine sites in the wet year compared to the dry year. Air temperature was revealed to be one of the most important variables affecting GPP, Reco, WUE, and ET in all the study sites. While relative air humidity was more important in southern Mediterranean sites, Conte et al. Forest Responses to Rainfall Variability global radiation was more significant in northern Italy. Our work suggests that a realistic prediction of the main responses of Italian forests under climate change should also take in account delayed responses due to acclimation to abiotic stress or changing environmental conditions.

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“…Drought, as a prolonged period of moisture deficiency in land surface, affects terrestrial ecosystems from structural and functional perspectives (i.e., constraining vegetation growth, causing plant mortality and triggering wildfire), which leads to profound imbalances in the terrestrial carbon cycle [1][2][3][4]. In addition, climate change, which is a consequence of increased greenhouse gas emission and global warming [5][6][7], will exacerbate drought frequency and severity in the 21st century [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Remote Sensing of Water Use Efficiency and Terrestrial Drought Recovery across the Contiguous United States

et al. 2019

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Ecosystem water-use efficiency (WUE) is defined as the ratio of carbon gain (i.e., gross primary productivity; GPP) to water consumption (i.e., evapotranspiration; ET). WUE is markedly influential on carbon and water cycles, both of which are fundamental for ecosystem state, climate and the environment. Drought can affect WUE, subsequently disturbing the composition and functionality of terrestrial ecosystems. In this study, the impacts of drought on WUE and its components (i.e., GPP and ET) are assessed across the Contiguous US (CONUS) at fine spatial and temporal resolutions. Soil moisture simulations from land surface modeling are utilized to detect and characterize agricultural drought episodes and remotely sensed GPP and ET are retrieved from the moderate resolution imaging spectroradiometer (MODIS). GPP, as the biome vitality indicator against drought stress, is employed to investigate drought recovery and the ecosystems’ required time to revert to pre-drought condition. Results show that drought recovery duration indicates a positive correlation with drought severity and duration, meaning that a protracted drought recovery is more likely to happen following severe droughts with prolonged duration. WUE is found to almost always increase in response to severe (or worse) drought episodes. Additionally, ET anomalies are negatively correlated with drought severity and ET is expected to decrease during severe (or worse) drought episodes. Lastly, the changes of WUE are decomposed in relation to its components and the cross-relation among the variables is revealed and a consistent changing pattern is detected.

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A global examination of the response of ecosystem water-use efficiency to drought based on MODIS data

Cited by 134 publications

References 44 publications

Effects of Climate Factors and Human Activities on the Ecosystem Water Use Efficiency throughout Northern China

Effects of Climate Factors and Human Activities on the Ecosystem Water Use Efficiency throughout Northern China

Ecophysiological Responses to Rainfall Variability in Grassland and Forests Along a Latitudinal Gradient in Italy

Remote Sensing of Water Use Efficiency and Terrestrial Drought Recovery across the Contiguous United States

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