Accumulated soil moisture deficit better indicates the effect of soil water stress on light use efficiency of grasslands during drought years

Zhang, Zhenyu; Zhou, Yanlian; Ju, Weimin; Chen, Jingming; Xiao, Jingfeng

doi:10.1016/j.agrformet.2022.109276

Cited by 14 publications

(7 citation statements)

References 136 publications

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“…Using the dual optimal bandwidths, the asymmetric Gaussian-based kernel function could measure the time-lagging relationship between NDVI and meteorological elements. The case of precipitation temporally lagging behind NDVI is likely attributed to the cumulative effect of soil moisture [ 36 , 52 , 59 ]. Abundant precipitation increased soil moisture and reduced vegetation's dependence on precipitation, resulting in a lagging response of vegetation to precipitation.…”

Section: Discussionmentioning

confidence: 99%

Analyzing nonlinear contributions from climate change and anthropogenic activity to the normalized difference vegetation index across China using a locally weighted regression approach

Shen

2023

Heliyon

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Section: Discussionmentioning

confidence: 99%

Analyzing nonlinear contributions from climate change and anthropogenic activity to the normalized difference vegetation index across China using a locally weighted regression approach

Shen

2023

Heliyon

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“…Because high-frequency data is of crucial importance to characterize the impact of flash drought events on vegetation, this study relies on MSG-derived NDVI data at high resolution as a proxy for soil moisture. However, soil moisture-driven phenological cycles in northeastern South America's landscape are partially attributed to the fact that persistent drought conditions can lead to a gradual decrease in the soil moisture level, resulting in weaker-than-normal photosynthetic activity [18]. Most importantly, however, a previous study by Otkin et al [7,30] shows that flash drought is identified by a sudden decrease in soil moisture percentile from above 40% to below 20% within a 20-day period.…”

Section: Introductionmentioning

confidence: 98%

“…Nevertheless, there is limited evidence of circulation changes attributable to greenhouse gas forcing that are affecting long-term changes in drought events [12]. In addition to their causes, drought events are also characterized by multifaceted and multidimensional impacts, such as on soil moisture content [18], vegetation growth conditions [19], and some hydrological parameters [19]. Drought events are often analyzed using indices, which are measures of drought severity, duration, and frequency, addressing different types of drought characteristics [20].…”

Section: Introductionmentioning

confidence: 99%

Flash Drought and Its Characteristics in Northeastern South America during 2004–2022 Using Satellite-Based Products

Barbosa

2023

Atmosphere

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The term flash drought describes a special category of drought with rapid onset and strong intensity over the course of days or weeks. To characterize the impact of flash droughts on vegetation coverage, this study assessed the influence of soil water deficits on vegetation dynamics in the northeastern South America region by combining time series of vegetation index, rainfall, and soil moisture based on satellite products at a daily time scale. An 18-year analysis, from 2004 to 2022, of the Normalized Difference Vegetation Index (NDVI), Standard Precipitation Index (SPI), and surface soil moisture (SSM) was performed based on three different satellite remote sensing estimates: the spinning enhanced visible and infrared imager (SEVIRI) and the integrated multi-satellite retrievals algorithm (IMERG), and the soil moisture and ocean salinity (SMOS). The results revealed that flash drought events exerted dramatic impacts on terrestrial ecosystems in the study region during the first two decades of the 2000s, with changes in seasonal and regional vegetation dynamics. Further, the fixed-threshold values to characterize flash drought events were suggested as the timing when the water deficit was less than −1.0 units and vegetation index reached the value equal to +0.3 during five consecutive weeks or more, coupled with soil moisture rates below 40% percentile, leading to a strong region-wide drought throughout the entire region. Additionally, the results of linear least squares trend analyses revealed a negative trend in the pentad-SEVIRI radiance for the solar channel 1 within the semiarid ecosystems of the study region (i.e., the Caatinga biome) that was suggested as a reduction in clouds in the 18 years of the study. Developing combined threshold measures of flash drought based on satellite remote sensing may lead to an accurate assessment of flash drought mitigation.

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“…Climate changes and a series of ecological protection and restoration projects have considerably increased the carbon sink function of grassland ecosystems in China [3]. At present, grassland ecosystems play a large part in the terrestrial carbon sink function [4]. The productivity of grassland ecosystems will undergo drastic changes as global drought expands and intensifies [5,6].…”

Section: Introductionmentioning

confidence: 99%

Altered Trends in Light Use Efficiency of Grassland Ecosystem in Northern China

Yuan,

Zhang,

Yao

et al. 2023

Remote Sensing

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Light use efficiency (LUE) is a crucial indicator used to reflect the ability of terrestrial ecosystems to transform light energy. Understanding the long-term trends in LUE and its influencing factors are essential for determining the future carbon sink and carbon sequestration potential of terrestrial ecosystems. However, the long-term interannual variability of LUE in grasslands in northern China at the ecosystem scale is poorly understood due to the limitations of the year length and the coverage of the site data. In this study, we assessed the long-term LUE trends in the grasslands of northern China from 1982 to 2018 and then revealed the relationships between interannual variability in LUE and climate factors. Our study showed a substantial rising trend for LUE from 1982 to 2018 in the grasslands of northern China (3.42 × 10−3 g C/MJ/yr). Regarding the different grassland types, alpine meadow had the highest growth rate (4.85 × 10−3 g C/MJ/yr), while temperate steppe had the lowest growth rate (1.58 × 10−3 g C/MJ/yr). The climate factors driving LUE dynamics were spatially heterogeneous in grasslands. Increasing precipitation accelerated the interannual growth rate of LUE in temperate steppe, and increasing temperature accelerated the interannual growth rate of LUE in other types. In addition, the temporal dynamic of LUE showed different trends in relation to time scales, and the growth trend slowed down after 1998. Our results should be considered in developing future grassland management measures and predicting carbon cycle–climate interactions.

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Accumulated soil moisture deficit better indicates the effect of soil water stress on light use efficiency of grasslands during drought years

Cited by 14 publications

References 136 publications

Analyzing nonlinear contributions from climate change and anthropogenic activity to the normalized difference vegetation index across China using a locally weighted regression approach

Analyzing nonlinear contributions from climate change and anthropogenic activity to the normalized difference vegetation index across China using a locally weighted regression approach

Flash Drought and Its Characteristics in Northeastern South America during 2004–2022 Using Satellite-Based Products

Altered Trends in Light Use Efficiency of Grassland Ecosystem in Northern China

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