Long-term variations in energy partitioning and evapotranspiration in a semiarid grassland in the Loess Plateau of China

Yue, Ping; Zhang, Qiang; Zhang, Liang; Li, Hongyu; Yang, Yang; Zeng, Jian

doi:10.1016/j.agrformet.2019.107671

Cited by 48 publications

(21 citation statements)

References 67 publications

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“…Salinity stress increased with drought. Similar to previous studies (Ma et al 2019;Yue et al 2019), drought inhibited daily E t by approximately 40% in 2019, reducing black locust growth and resulting in smaller peak value of L ai . With the background of climate warming and periods of drought extending on the North China Plain (Wang et al 2017b), the black locust plantation in the Yellow River Delta may be facing severe pressure to survive.…”

Section: Evapotranspirationsupporting

confidence: 87%

“…Climate change in turn, affects a variety of physical and eco-physiological processes in vegetation and alters energy exchange between the land and the atmosphere (Zhu et al 2014). Previous studies have demonstrated that surface albedo is lower in forests than in croplands, grasslands, and deserts, and therefore, forests absorb more solar radiation (Zhu et al 2014;Gao et al 2018;Yue et al 2019). Forests cover approximately 30% of the Earth's land surface (Iida et al 2009) and are distributed from tropical to cold temperate zones.…”

Section: Introductionmentioning

confidence: 99%

“…Variations of E t are controlled by meteorological factors, vegetation properties and soil water conditions (Gao et al 2018;Valayamkunnath et al 2018;Yue et al 2019). Xiao et al (2013) reported annual E t variations from 150.5 to 957.8 mm across six forest sites in China.…”

Section: Introductionmentioning

confidence: 99%

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Energy partitioning and evapotranspiration in a black locust plantation on the Yellow River Delta, China

Gao

Yang

et al. 2021

J. For. Res.

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to downward radiation was 18-19% over the three years. During the growing season, latent heat flux was the largest component of net radiation; during the dormant season, the sensible heat flux was the dominant component of net radiation. The seasonal variation in daily evapotranspiration was mainly controlled by net radiation, air temperature, vapor pressure deficit, and leaf area index. Black locust phenology influenced daily evapotranspiration variations, and evapotranspiration was greater under sea winds than under land winds because soil water content at 10-cm depth was greater under sea winds during the day. Seasonal patterns of daily evaporative fraction, Bowen ratio, crop coefficient, Priestley-Taylor coefficient, surface conductance, and decoupling coefficient were mainly controlled by leaf area index. The threshold value of daily surface conductance was approximately 8 mm s −1 over the plantation.

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Section: Evapotranspirationsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Energy partitioning and evapotranspiration in a black locust plantation on the Yellow River Delta, China

Gao

Yang

et al. 2021

J. For. Res.

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“…All of the sources of uncertainty further lead to a fundamental problem with EC; that is, the energy balances determined using EC are generally "unclosed", with the summary of sensible and latent heat fluxes often underestimating available energy by 20% or more [78]. Previous studies have shown that the energy balance closure ratio of forest stations in ChinaFLUX and ASIAFLUX is around 70-90% [79]. Thus, quite a lot of researchers have suggested that the closure issue of measured energy fluxes must be resolved before it is used to evaluate energy and water exchange products [73,78,80].…”

Section: Uncertainties In Assessment Methodsmentioning

confidence: 99%

Assessment and Inter-Comparison of Multi-Source High Spatial Resolution Evapotranspiration Products over Lancang–Mekong River Basin, Southeast Asia

et al. 2022

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Evapotranspiration (ET) plays a crucial role in water balance within the global hydrological cycle. Timely assessment of ET products can provide the scientific basis for quantitative analysis of hydrological cycle processes and water resources assessment. In this paper, four high spatial resolution remote sensing ET products—the Moderate-resolution Imaging Spectroradiometer global terrestrial evapotranspiration product (MOD16), the ET product based on Penman–Monteith–Leuning equation version 2 (PML-V2), the ET product based on the Breathing Earth System Simulator (BESS) and the ET product of the Global LAnd Surface Satellite (GLASS)—were firstly assessed using the eddy covariance (EC) of different vegetation types in the Lancang–Mekong River Basin (LMRB). To fully assess the performances of these four products, spatiotemporal inter-comparisons and literature comparisons were also conducted across different climatic zones. The results are summarized as follows: (1) MOD16 does not perform well as compared to the other three products, with its Root Mean Square Error (RMSE) being higher than GLASS, PML-V2 and BESS, which are approximately 0.47 mm/8-day, 0.66 mm/8-day, and 0.90 mm/8-day, respectively; (2) the performance of each product varies across different vegetation types, and even within the same climate zone. PML-V2 performs best in evergreen broadleaf forests, BESS performs best in deciduous broadleaf forests and croplands, and GLASS performs best in shrubs, grasslands and mixed vegetation; (3) each product can well reflect the spatial difference brought by topography, climate and vegetation over the entire basin but all four ET products do not show either a consistent temporal trend or a uniform spatial distribution; (4) ET ranges of these four products over LMRB are consistent with previous literature in evergreen broadleaf forests, deciduous broadleaf forests, needleleaf forests and mixed forests in other regions with the same climate zones, but they show great differences in croplands, grasslands and shrubs. This study will contribute to improving our understanding of these four ET products in the different climatic zones and vegetation types over LMRB.

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“…A remote sensing-based indicator proposed by Anderson et al (2007), the evaporative stress index (ESI), can convey useful information about the magnitude and direction of short-and long-term moisture stress [32]. The ESI combines the influences of terrestrial and climatic variables on land surface moisture status and can, therefore, provide early warning of drought initiation and intensification [33,34]. In this study, we first investigated the land cover change and vegetation dynamics on the LP since the implementation of the Grain for Green Project based on remote sensing products.…”

Section: Introductionmentioning

confidence: 99%

The Water Availability on the Chinese Loess Plateau since the Implementation of the Grain for Green Project as Indicated by the Evaporative Stress Index

Qiu

Chen

et al. 2021

Remote Sensing

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The vegetation coverage on the Loess Plateau (LP) of China has clearly increased since the implementation of the Grain for Green Project in 1999, but there is a debate about whether the improved greenness was achieved at the expense of the balance between the supply and demand of water resources. Therefore, developing reliable indicators to evaluate the water availability is a prerequisite for maintaining ecological sustainability and ensuring the persistence of vegetation restoration. This study was designed to evaluate water availability on the LP during 2000–2015, using the evaporative stress index (ESI) derived from a remote sensing dataset. The relative dependences of the ESI on climatic and biological factors (including temperature, precipitation and land cover change) were also analyzed. The results showed that the leaf area index (LAI) in most regions of the LP showed a significant increasing trend (p < 0.05), and larger gradients of increase were mainly detected in the central and eastern parts of the LP. The evapotranspiration also exhibited an increasing trend in the central and eastern parts of the LP, with a gradient greater than 10 mm/year. However, almost the whole LP exhibited a decreased ESI from 2000 to 2015, and the largest decrease occurred on the central and eastern LP, indicating a wetting trend. The soil moisture storage in the 0–289-cm soil profiles showed an increasing trend in the central and eastern LP, and the area with an upward trend enlarged with the soil depth. Further analysis revealed that the decreased ESI on the central and eastern LP mainly depended on the increase in the LAI compared with climatic influences. This work not only demonstrated that the ESI was a useful indicator for understanding the water availability in natural and managed ecosystems under climate change but also indicated that vegetation restoration might have a positive effect on water conservation on the central LP.

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Long-term variations in energy partitioning and evapotranspiration in a semiarid grassland in the Loess Plateau of China

Cited by 48 publications

References 67 publications

Energy partitioning and evapotranspiration in a black locust plantation on the Yellow River Delta, China

Energy partitioning and evapotranspiration in a black locust plantation on the Yellow River Delta, China

Assessment and Inter-Comparison of Multi-Source High Spatial Resolution Evapotranspiration Products over Lancang–Mekong River Basin, Southeast Asia

The Water Availability on the Chinese Loess Plateau since the Implementation of the Grain for Green Project as Indicated by the Evaporative Stress Index

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