Comparative analysis of forest disturbance detection in the key state-owned forest region of the Greater Khingan Range of China based on different algorithms

Geocarto International, Journal Year: 2025, Volume and Issue: 40(1)

Published: April 15, 2025

Language: Английский

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Spatiotemporal Variations of Vegetation NPP Based on GF-SG and kNDVI and Its Response to Climate Change and Human Activities: A Case Study of the Zoigê Plateau

Forests, Journal Year: 2024, Volume and Issue: 16(1), P. 32 - 32

Published: Dec. 27, 2024

Net primary productivity (NPP) is a key metric for evaluating ecosystem carbon sink capacity and defining vegetation. Despite extensive research on vegetation NPP, much relies coarse spatial resolution data, which often overlooks regional heterogeneity, causing inaccuracies in NPP estimates. Therefore, this study employed the improved CASA model, based GF-SG kNDVI methods, to estimate at 30 m Zoigê Plateau from 2001 2020. The effects of anthropogenic climatic factors were quantified through residual partial correlation analyses. These results indicated following: (1) NDVI derived fusion method aligns closely with Landsat (R2 ≈ 0.9). When contrasted using alone, incorporating into model enhances assessment accuracy. (2) Vegetation has fluctuated upward by 2.09 gC·m−2·a−1 over last two decades, higher values centrally lower edges. (3) Monthly analysis indicates almost no temporal response temperature (97.42%) but significant cumulative precipitation (80.3%), longer accumulation periods south. Annual reveals that correlates more strongly than precipitation. (4) changes are jointly influenced climate change (48.46%) human activities (51.54%), latter being dominant factor. This deepens understanding dynamics offers insights estimating high spatial-temporal resolutions.

Language: Английский

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An Evaluation of the Performance of Remote Sensing Indices as an Indication of Spatial Variability and Vegetation Diversity in Alpine Grassland

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(24), P. 4726 - 4726

Published: Dec. 18, 2024

Vegetation diversity is a crucial indicator for evaluating grassland ecosystems. Remote sensing technology has great potential in assessing vegetation diversity. In this study, the relationship between remote indices and species was investigated at varying spatial temporal scales Bayanbulak Grassland National Nature Reserve, China. Spectral variation, defined as coefficient of variation indices, used proxy diversity, which quantified using indices. The “spectral diversity-species diversity” validated across diverse different years Sentinel-2 images ground investigation data. This study found that Kendall’s τ coefficients showed best performance VIs (CVVIs) index. highest value observed CVNDVI 2017 (τ = 0.660, p < 0.01), followed by Shannon index 2018 0.451, 0.01). addition, CVEVI demonstrated significant positive correlation with Shannon-Wiener Index 50 m scale 0.542), 100 0.660). relation to CVVIs performs better representing changes vegetation. Spatial influence assessment These findings underscore critical role various scales, offering valuable support tools measuring regional

Language: Английский

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The Wheel of Vegetation: A Spatial and Temporal Story of Vegetation Evolution in the Shennongjia Forest District

Forests, Journal Year: 2024, Volume and Issue: 15(12), P. 2252 - 2252

Published: Dec. 22, 2024

As one of the most well-preserved areas in vertical band spectrum vegetation central China and even northern hemisphere at same latitude, Shennongjia Forest District is vital to global ecological balance. In order fully understand change study area, remotely sensed data since 1990, combined with Sen-MK test, Geo detector, LandTrendr algorithm, were used analyze distribution characteristics trends. The results showed that: (1) overall NDVI area displayed an upward trend. (2) Vegetation disturbance occurred frequently before 2000 decreased significantly after 2000. severely disturbed year was 1991 when amounted 4.0851 km2, accounting for 16.76% total area. analysis topographic environment reveals that disturbances occur slopes 15–25° elevations 1500–2000 m, which indicates these have frequent human activity. (3) explanatory power different influences on changes varied, altitude having significant effect superposition two increasing change. Over past 30 years, has shown a general trend recovery, natural forest protection initiatives playing critical role mitigating disturbance. This comprehensive offers valuable research paradigm conservation sustainable development temperate forests similar latitudes, providing insights into management ecosystems.

Language: Английский

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Monitoring Vegetation as Habitat (Paradisaea minor jobiensis Rothschild, 1879) in the Period 2024, 2018, and 2024 to Support Birdwatching Ecotourism in Barawai Yapen Islands Regency Papua

Jurnal Penelitian Pendidikan IPA, Journal Year: 2024, Volume and Issue: 10(12), P. 10699 - 10719

Published: Dec. 28, 2024

Imbowiari Forest in Barawai Village, Yapen, Papua, has complex flora and fauna biodiversity, including as a habitat for Paradisaea minor jobiensis. In especially the Yapen Islands Regency, endemic species such jobiensis are main attraction tourists. Managed by community through local wisdom Dorey Jaya group, this area potential to be developed birdwatching ecotourism. However, it not been widely popular with This study aims analyze changes vegetation of bird's three periods (2014, 2018, 2024) provide recommendations ecotourism management Barawai. Vegetation structure composition data were collected using grid line method analyzed PAST software. The results showed an increase number at all levels, seedlings (21 2014 72 2024), saplings (27 64), poles (26 76), trees (41 96). individuals also increased significantly, on poles. diversity index increased, tree level (2.78 4.07). indicates overall vegetation, optimizing based biodiversity wisdom.

Language: Английский

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