Evidence and attribution of the enhanced land carbon sink

Nature Reviews Earth & Environment, Journal Year: 2023, Volume and Issue: 4(8), P. 518 - 534

Published: July 25, 2023

Language: Английский

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Estimating Agricultural Soil Moisture Content through UAV-Based Hyperspectral Images in the Arid Region

Remote Sensing, Journal Year: 2021, Volume and Issue: 13(8), P. 1562 - 1562

Published: April 17, 2021

Unmanned aerial vehicle (UAV)-based hyperspectral remote sensing is an important monitoring technology for the soil moisture content (SMC) of agroecological systems in arid regions. This develops precision farming and agricultural informatization. However, data are generally used mining. In this study, UAV-based imaging with a resolution o 4 cm totaling 70 samples (0–10 cm) were collected from farmland (2.5 × 104 m2) near Fukang City, Xinjiang Uygur Autonomous Region, China. Four estimation strategies tested: original image (strategy I), first- second-order derivative methods II), fractional-order (FOD) technique III), optimal fractional order combined multiband indices IV). These based on eXtreme Gradient Boost (XGBoost) algorithm, aim building best model SMC The results demonstrated that FOD could effectively mine information (with absolute maximum correlation coefficient 0.768). By comparison, strategy IV yielded estimates out tested (R2val = 0.921, RMSEP 1.943, RPD 2.736) SMC. derived 0.4 within worked relatively well among different I, II, III). conclusion, combination generated highly accurate XGBoost algorithm estimation. research provided promising mining approach data.

Language: Английский

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Drivers of recent decline in dust activity over East Asia

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Nov. 19, 2022

Abstract It is essential to understand the factors driving recent decline of dust activity in East Asia for future projections. Using a physically-based emission model, here we show that weakening surface wind and increasing vegetation cover soil moisture have all contributed during 2001 2017. The relative contributions these three reduction 2010–2017 are 46%, 30%, 24%, respectively. Much (78%) from barren lands, small fraction (4.6%) attributed grassland increase partly ascribed ecological restoration. This suggests restoration plays minor role activity. Rather, mainly driven by climatic factors, with playing dominant role.

Language: Английский

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Global variations in critical drought thresholds that impact vegetation

National Science Review, Journal Year: 2023, Volume and Issue: 10(5)

Published: Feb. 24, 2023

Identifying the thresholds of drought that, if crossed, suppress vegetation functioning is vital for accurate quantification how land ecosystems respond to climate variability and change. We present a globally applicable framework identify responses different levels known soil-moisture deficits using four remotely sensed proxies spanning 2001-2018. The identified represent critical inflection points changing from highly resistant vulnerable in response stress, as warning signal substantial impacts. Drought varied geographically, with much lower percentiles anomalies vegetated areas covered by more forests, corresponding comparably stronger capacity mitigate soil water deficit stress forested ecosystems. Generally, those are detected humid climates. State-of-the-art models, however, overestimated moisture (i.e. overestimating impacts), especially higher forest covers arid few covers. Based on model projections, we predict that risk damage will increase end twenty-first century some hotspots like East Asia, Europe, Amazon, southern Australia eastern Africa. Our data-based results inform projections future impacts terrestrial provide an effective tool management.

Language: Английский

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Challenges and solutions to biodiversity conservation in arid lands

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 857, P. 159695 - 159695

Published: Oct. 24, 2022

Language: Английский

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Southern Hemisphere dominates recent decline in global water availability

Science, Journal Year: 2023, Volume and Issue: 382(6670), P. 579 - 584

Published: Nov. 2, 2023

Global land water underpins livelihoods, socioeconomic development, and ecosystems. It remains unclear how availability has changed in recent decades. Using an ensemble of observations, we quantified global over the past two We show that Southern Hemisphere dominated declining trend from 2001 to 2020. The significant decrease occurs mainly South America, southwestern Africa, northwestern Australia. In Northern Hemisphere, complex regional increasing decreasing trends cancel each other, resulting a negligible hemispheric trend. variability are largely driven by precipitation associated with climate modes, particularly El Niño-Southern Oscillation. This study highlights their dominant role controlling availability.

Language: Английский

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Dominant role of soil moisture in mediating carbon and water fluxes in dryland ecosystems

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(1), P. 38 - 43

Published: Jan. 1, 2024

Language: Английский

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Projected increase in global runoff dominated by land surface changes

Nature Climate Change, Journal Year: 2023, Volume and Issue: 13(5), P. 442 - 449

Published: April 17, 2023

Language: Английский

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Discussion of the “warming and wetting” trend and its future variation in the drylands of Northwest China under global warming

Science China Earth Sciences, Journal Year: 2023, Volume and Issue: 66(6), P. 1241 - 1257

Published: May 16, 2023

Language: Английский

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Wetting and drying trends under climate change

Nature Water, Journal Year: 2023, Volume and Issue: 1(6), P. 502 - 513

Published: May 8, 2023

Language: Английский

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