Assessing the Impacts of Drought on Grassland Net Primary Production at the Global Scale

Wang, Qian; Yang, Young-Hoon; Liu, Yangyang; Tong, Linjing; Zhang, Qipeng; Li, Jianlong

doi:10.1038/s41598-019-50584-4

Cited by 38 publications

(21 citation statements)

References 47 publications

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“…Satellite-based observation offers a method for monitoring and characterizing the spatiotemporal dynamics of vegetation under changing climates [12], which is especially valuable for remote areas such as most Australia's interior with very sparse monitoring sites. Traditional reflectance-based vegetation indices are widely applied to assess the effects of extreme drought on ecosystem functioning and vegetation productivity at a regional, continental, or global scale [8,[13][14][15][16][17]. Dramatic impacts of climate extremes on vegetation dynamics (as measured by EVI) with abrupt changes in phenology and productivity over southeast Australia demonstrates that semiarid ecosystems exhibit the largest sensitivity to hydro-climatic variations [18,19].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Impact of Extreme Droughts on Dryland Vegetation by Multi-Satellite Solar-Induced Chlorophyll Fluorescence

et al. 2022

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Satellite-estimated solar-induced chlorophyll fluorescence (SIF) is proven to be an effective indicator for dynamic drought monitoring, while the capability of SIF to assess the variability of dryland vegetation under water and heat stress remains challenging. This study presents an analysis of the responses of dryland vegetation to the worst extreme drought over the past two decades in Australia, using multi-source spaceborne SIF derived from the Global Ozone Monitoring Experiment-2 (GOME-2) and TROPOspheric Monitoring Instrument (TROPOMI). Vegetation functioning was substantially constrained by this extreme event, especially in the interior of Australia, in which there was hardly seasonal growth detected by neither satellite-based observations nor tower-based flux measurements. At a 16-day interval, both SIF and enhanced vegetation index (EVI) can timely capture the reduction at the onset of drought over dryland ecosystems. The results demonstrate that satellite-observed SIF has the potential for characterizing and monitoring the spatiotemporal dynamics of drought over water-limited ecosystems, despite coarse spatial resolution coupled with high-retrieval noise as compared with EVI. Furthermore, our study highlights that SIF retrieved from TROPOMI featuring substantially enhanced spatiotemporal resolution has the promising capability for accurately tracking the drought-induced variation of heterogeneous dryland vegetation.

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Section: Introductionmentioning

confidence: 99%

Assessing the Impact of Extreme Droughts on Dryland Vegetation by Multi-Satellite Solar-Induced Chlorophyll Fluorescence

et al. 2022

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“…Li et al (2017), in their field manipulation experiment in the semiarid C 3 steppe of Inner Mongolia, China, showed similar magnitudes of reduction in GPP and ecosystem respiration in response to warming. Although a meta‐analysis demonstrated that ecosystem respiration was more sensitive to warming than GPP in temperate grasslands, differences in photosynthetic pathway and phenology likely contribute to variable responses (Q. Wang et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Although a meta-analysis demonstrated that ecosystem respiration was more sensitive to warming than GPP in temperate grasslands, differences in photosynthetic pathway and phenology likely contribute to variable responses (Q. Wang et al, 2019).…”

Section: Does Warming Alter C Allocation In Perennial Grass?mentioning

confidence: 99%

Drought and warming alter gross primary production allocation and reduce productivity in a widespread pasture grass

Chandregowda

Tjoelker

Power

et al. 2022

Plant Cell & Environment

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Carbon allocation determines plant growth, fitness and reproductive success.However, climate warming and drought impacts on carbon allocation patterns in grasses are not well known, particularly following grazing or clipping. A widespread C 3 pasture grass, Festuca arundinacea, was grown at 26 and 30°C in controlled environment chambers and subjected to drought (65% reduction relative to wellwatered controls). Leaf, root and whole-plant carbon fluxes were measured and linked to growth before and after clipping. Both drought and warming reduced gross primary production and plant biomass. Drought reduced net leaf photosynthesis but increased the leaf respiratory fraction of assimilated carbon. Warming increased root respiration but did not affect either net leaf photosynthesis or leaf respiration. There was no evidence of thermal acclimation. Moreover, root respiratory carbon loss was amplified in the combined drought and warming treatment and, in addition to a negative carbon balance aboveground, explained an enhanced reduction in plant biomass. Plant regrowth following clipping was strongly suppressed by drought, reflecting increased tiller mortality and exacerbated respiratory carbon loss. These findings emphasize the importance of considering carbon allocation patterns in response to grazing or clipping and interactions with climatic factors for sustainable pasture production in a future climate.

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“…The data are widely used in monitoring global and regional ecosystem carbon cycles (Cai et al 2020;Guo et al 2019;Liu et al 2015;Liu et al 2019) (Palmer 1965), and self-calibrated Palmer Drought Severity Index (scPDSI) (Wells et al 2004). PDSI was calculated based on temperature and precipitation information and widely applied for agricultural drought monitoring since 1965 (Liu et al 2016;Wang et al 2019;Wu et al 2020). The scPDSI was calculated with monthly precipitation and air temperature-driven observations available from the Climatic Research Unit (CRU) high-resolution surface climate data set CRU TS4.03 (Schrier et al 2013;Wells et al 2004).…”

Section: Gpp Et and Scpdsi Datamentioning

confidence: 99%

Spatial heterogeneity of changes in cropland ecosystem water use efficiency and responses to drought in China

Zhao

Cheng

et al. 2021

Environ Sci Pollut Res

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Understanding cropland ecosystem water use efficiency (eWUE) responses to drought is important for sustainable water resource management and food security. Today in China, the spatiotemporal patterns of eWUE and responses to drought across different cropland classes remain poorly quantified. In this study, we characterized the spatial temporal variability in cropland eWUE and response to drought in China from 1982 to 2017 using the satellite-retrieved evapotranspiration (ET), gross primary production (GPP), and self-calibrating Palmer Drought Severity Index (scPDSI), in conjunction with the Global Food Security-support Analysis Data product for Crop Dominance (GFSAD1KCD) data. Results indicated that (1) mean annual cropland eWUE had a spatial range from 0 to 9.94 g C kg -1 H 2 O, with higher values (2.06 g C kg -1 H 2 O) in class 4 (rainfed: wheat, rice, and soybeans dominant), whereas the lowest eWUE (1.58 g C kg -1 H 2 O) occurred in class 2 (irrigated mixed crop 1: wheat, rice, barley, and soybeans). ( 2) Annual eWUE, GPP, and ET values for croplands in China increased significantly between 1982 and 2017. Class 1 (irrigated wheat and rice) had the highest trend of 0.011 g C kg -1 H 2 O yr -1 , and class 6 (rainfed: corn and soybeans) had the lowest of 0.0007 g C kg -1 H 2 O yr -1 . Apart from class 4, annual GPP and ET were enhanced in most cropland classes from 1982 to 2017 (p<0.01). (3) Rainfed croplands generally had higher eWUE, GPP, and ET values than irrigated croplands. Except for rainfed cropland eWUE, all other cropland variables increased significantly (p<0.001) from 1982 to 2017. (4) Correlation analysis found that the 19.66% (15.62%) of cropland had significant negative (positive) correlations between eWUE and current-year scPDSI. The legacy effects of drought on cropland eWUE indicated that previous and current-year drought impacts on cropland eWUE were in the same direction. Our results provide insights into variability in cropland eWUE and its response to drought in China, where there is a growing demand for agricultural water resource management.

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Assessing the Impacts of Drought on Grassland Net Primary Production at the Global Scale

Cited by 38 publications

References 47 publications

Assessing the Impact of Extreme Droughts on Dryland Vegetation by Multi-Satellite Solar-Induced Chlorophyll Fluorescence

Assessing the Impact of Extreme Droughts on Dryland Vegetation by Multi-Satellite Solar-Induced Chlorophyll Fluorescence

Drought and warming alter gross primary production allocation and reduce productivity in a widespread pasture grass

Spatial heterogeneity of changes in cropland ecosystem water use efficiency and responses to drought in China

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