Quantitatively analyzing the driving factors of vegetation change in China: Climate change and human activities

Ecological Informatics, Journal Year: 2024, Volume and Issue: 82, P. 102667 - 102667

Published: June 5, 2024

Understanding the impact of climate change and human activities on vegetation dynamics is crucial for ecosystem management. Employing Residual Trend method integrating Normalized Difference Vegetation Index (NDVI) data with land use/cover, this study assesses impacts across China from 2000 to 2018. The findings indicate a consistent upward trend China's Growing Season NDVI (GSN), averaging rate 0.0032/yr. Human are primary drivers change, contributing 82.47% GSN in China, while accounts 17.53%. effect showed considerable variation different river basins, Huaihe River Basin experiencing highest (93.53%) Continental lowest (76.27%). Conversely, experienced greatest (23.73%), compared minimal influence (6.47%). results offer contribution rates each type changed unchanged use, persistent forestland, grassland, cropland, grassland forest conversion 28.65%, 22.09%, 13.76%, 4.61%, respectively. Persistent forestland emerges as most efficacious use facilitating restoration. Within forestlands Yangtze, Pearl, Southeast Basins, accounted 26.99%, 42.18%, 43.50% alterations, These provide scientific basis formulating effective management protection strategies.

Language: Английский

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Response of vegetation carbon sequestration potential to the effectiveness of vegetation restoration in karst ecologically fragile areas in Guizhou, southwest China

Ecological Indicators, Journal Year: 2024, Volume and Issue: 158, P. 111495 - 111495

Published: Jan. 1, 2024

In the southwest karst areas of China, changes in overlying vegetation due to ecological restoration cause considerable carbon sequestration (CS). Assessing CS potential this is crucial for promoting optimization and regulation regional restoration(VR) policies. This study based on net primary productivity, maximum coverage average coverage. Using VR effectiveness index (Ej) quantitatively evaluate spatiotemporal characteristics effectiveness, quantifying pattern using photosynthetic model, clarifying main driving mechanisms CS.This results showed that more than 54.25 % studied area ecologically fragile has achieved significant (Ej ≥ 20) from 2000 2020. The spatial distribution intensity was higher northeast. Moreover, there a strong correlation between with greater densities poor natural background conditions, showing economic growth complement each other. current value cover r = 0.06 (p < 0.05) magnitude change 0.38 0.05), which indicates where greening greater. range constrained by environment areas, continuous enhancement positive feedback intervention weakening negative tended promote ground surface increased potential. provide reference long-term goal "carbon neutrality" response offset atmospheric CO2 emissions.

Language: Английский

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Locating Hydrologically Unsustainable Areas for Supporting Ecological Restoration in China's Drylands

Earth s Future, Journal Year: 2024, Volume and Issue: 12(3)

Published: March 1, 2024

Abstract China has undertaken extensive ecological restoration (ER) projects since the late 1970s in drylands, dominating greening of drylands. The greening, especially ER‐induced, can affect regional water availability and even cause hydrological unsustainability (i.e., lead to a negative shift ecosystem supply demand balances). However, there is still limited research on accurately identifying hydrologically unsustainable areas (GA) China's Here, we developed an supply‐demand indicator, namely, self‐sufficiency (WSS), defined as ratio precipitation. Using remote sensing multisource synthesis data sets combined with trend analysis time series detection, conducted spatially explicit assessment sustainability risk drylands context ER over period 1987–2015. results showed that 17.15% (6.36 × 10 4 km 2 ) GA faced WSS (indicating unsustainability), mainly Inner Mongolia, Shanxi, Xinjiang provinces, driven by evapotranspiration. Moreover, 29.34% (1.09 5 GA, whose area roughly double exhibited potential shortage significant decline (−0.014 yr −1 ), concentrated Shaanxi, Gansu provinces. reliability our findings was demonstrated through previous studies at local scale soil moisture changes. Our offer precise grid‐scale identification providing more specific spatial guidance for implementation adaptation

Language: Английский

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Staunch Defender of COP27: A 20‐Year Journey of Land Revegetation Projects in China

Land Degradation and Development, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 6, 2025

ABSTRACT In response to the risks posed by urbanization and climate change land availability, China has implemented several significant cover restoration initiatives since 1998. These have notably contributed objectives of 27th Conference Parties United Nations Framework Convention on Climate Change (COP27). However, a systematic evaluation ecological effects vegetation from these been lacking. This study utilized NDVI, NPP, TerraClimate data comprehensively assess spatial temporal variations in Vegetation Ecological Quality Index (VEQI) across analyze its initiatives. The analysis, spanning 2002 2022, various remote sensing sources geostatistical techniques, including Hurst index, multiple regression residual meta‐scale Theil–Sen median trend analysis. results indicate consistent increase China's VEQI over past 20 years. Notably, Natural Forest Resources Protection Project Beijing–Tianjin Wind Sand Source Comprehensive Control played crucial roles efforts. Nationally, interaction between human activities emerged as dominant factor, affecting approximately 56.8% area. Additionally, our projections varied future for trends. While areas with increasing account about 70.66% total area, regions decreasing trends or transitioning decrease represent 29.34%. Based study's findings, we recommend development tailored strategies aligned regional enhancement balance amidst address declining quality. insights highlight complex relationship context COP27, providing valuable guidance advancing sustainable goals protection

Language: Английский

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Rainfall partitioning by vegetation in China: A quantitative synthesis

Journal of Hydrology, Journal Year: 2022, Volume and Issue: 617, P. 128946 - 128946

Published: Dec. 14, 2022

Rainfall partitioning into stemflow, throughfall, and interception loss by vegetation alters hydrological biogeochemical fluxes between soil. Here, we compiled a comprehensive dataset of rainfall forests, shrublands, croplands, grasslands in China from 287 peer reviewed papers (71 English 216 Chinese). Based on this dataset, summarized the best-fit functions reported for (in both mm %) as function amount, well thresholds throughfall stemflow initiation. We explored pattern proportions China, performed boosted regression trees (BRT) analysis to model relative effects cross-site biotic abiotic predictors each (%). Our results identified scarcity data, particularly grasslands. A substantial variability flux (mm) could be explained solely with median R2 values 0.91, 0.99, 0.82 loss, respectively, linear most often functions. Significant differences (p < 0.0001) were detected initiating (median: 3.3 mm; interquartile range, IQR: 1.8–5.4 mm) 1.2 0.8–2.2 mm). Stemflow (%) had (IQR) 2.7 % (1.2–6.0 %), that value was 74.3 (66.7–80.3 21.6 (16.3–28.5 (%), respectively. proportion 0.001) 0.01) forests respectively; whereas no significant found among types. BRT indicated eleven examined, six classified determining four predictors. Non-linear partial prevalent. This study avails global readership findings large cache Chinese studies have been inaccessible hitherto, providing mechanistic understanding fluxes.

Language: Английский

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Ecohydrological decoupling of water storage and vegetation attributed to China’s large-scale ecological restoration programs

Journal of Hydrology, Journal Year: 2022, Volume and Issue: 615, P. 128651 - 128651

Published: Nov. 6, 2022

Language: Английский

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Normal Difference Vegetation Index Simulation and Driving Analysis of the Tibetan Plateau Based on Deep Learning Algorithms

Forests, Journal Year: 2024, Volume and Issue: 15(1), P. 137 - 137

Published: Jan. 9, 2024

Global climate warming has profoundly affected terrestrial ecosystems. The Tibetan Plateau (TP) is an ecologically vulnerable region that emerged as ideal place for investigating the mechanisms of vegetation response to change. In this study, we constructed annual synthetic NDVI dataset with 500 m resolution based on MOD13A1 products from 2000 2021, which were extracted by Google Earth Engine (GEE) and processed Kalman filter. Furthermore, considering topographic climatic factors, a thorough analysis was conducted ascertain causes effects NDVI’s spatiotemporal variations TP. main findings are: (1) coverage TP been growing slowly over past 22 years at rate 0.0134/10a, notable heterogeneity due its topography conditions. (2) During study period, generally showed “warming humidification” trend. influence human activities growth exhibited favorable trajectory, acceleration observed since 2011. (3) primary factor influencing in southeastern western regions increasing temperature. Conversely, northeastern central mostly regulated precipitation. (4) Combined principal component analysis, PCA-CNN-LSTM (PCL) model demonstrated significant superiority modeling sequences Plateau. Understanding results paper important sustainable development formulation ecological policies

Language: Английский

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Study on the Landscape Space of Typical Mining Areas in Xuzhou City from 2000 to 2020 and Optimization Strategies for Carbon Sink Enhancement

Remote Sensing, Journal Year: 2022, Volume and Issue: 14(17), P. 4185 - 4185

Published: Aug. 25, 2022

The continuous extraction of mining resources has led to the destruction landscape space, which had a great impact on human living environment and pristine ecosystems. Optimizing ecological spatial networks areas can restore enhance damaged environment. However, there are few cases network optimization in areas, still some shortcomings. Therefore, this study, we propose an theory synergistic enhancement functions carbon sink model (SEEC) for urban restoration emphasizing functional nature sources. We selected typical area Xuzhou City as study area, explored changes function from 2000 2020, 2020 case, adding 27 stepping stones 72 corridors. Through comparison robustness before after optimization, found that optimized stronger stability ability. This provides strategies methods projects national cities also references lessons other future.

Language: Английский

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Shifts bidirectional dependency between vegetation greening and soil moisture over the past four decades in China

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 897, P. 166388 - 166388

Published: Aug. 18, 2023

Language: Английский

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Tracing climatic and human disturbance in diverse vegetation zones in China: Over 20 years of NDVI observations

Ecological Indicators, Journal Year: 2023, Volume and Issue: 156, P. 111170 - 111170

Published: Oct. 31, 2023

Over the past two decades (2000–2021), China has experienced a significant increase in vegetation cover. However, intricate spatial and temporal variations cover, arising from interaction of climate change human activities, remain enigmatic, particularly across diverse zones. This research endeavors to unravel dynamics cover using MOD13A1 Normalized Difference Vegetation Index (NDVI) dataset, delving into China's seven distinct zones (VZ1-VZ7). employs residual analysis, relative geo-detector techniques investigate drivers NDVI variation heterogeneity The findings reveal compelling upward trajectory NDVI, predicted during 2000–2021 period. Notably, extremely increases are discernible approximately 53.90%, 50.13%, 23.29% respectively. Among zones, VZ3 displays highest rates, yet proportion with VZ1 surpasses other analysis underscores as predominant catalyst for enhancement, although an exception is noted VZ3. Furthermore, primarily influenced by interactions between land use types humidity, sunshine duration, precipitation, especially humidity types. Significant changes can lead marked alterations structure function terrestrial ecosystems, while patterns at regional level also alter type which together exert impact on NDVI. These results accentuate importance formulating tailored ecosystem management strategies characteristics each zone ensure sustainable development ecosystems China.

Language: Английский

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