Analysis of measurement differences and causes of C, N, and P in river flooding areas—taking the Hailar River in China as an example DOI Creative Commons

Xi Dong,

Chunming Hu

PeerJ, Journal Year: 2024, Volume and Issue: 12, P. e17745 - e17745

Published: July 12, 2024

The Hailar River is located in the Inner Mongolia Autonomous Region of Northeast China. It a connecting hub agricultural pastoral transitional zone on Hulunbuir grassland, with abundant water and biodiversity resources, important ecological conservation significance. This study takes as research area to evaluate impact main influencing factors soil C, N, P measurement from upstream downstream concave convex riverbanks River. results show that: (1) average particle size shows differences downstream: Section 1 31.6–192.3 µm, 2 21–213 3 21–288 4 42–206 µm; pH value generally low, while increases. reason for this that bank has sufficient water, which plays role inhibiting salt content; (2) nutrient content higher region than region, difference between regions relatively small bank; (3) banks mostly positively correlated moisture content, are negatively size. Research shown different cross-sections downstream, well uneven riverbanks, significantly affect physicochemical properties measurements. Studying riparian zones under typical can provide new ideas regional protection even global cycling.

Language: Английский

Impacts of climate change on fractional vegetation coverage of temperate grasslands in China from 1982 to 2015 DOI

Rong Ma,

Jiaqi Zhang, Xiangjin Shen

et al.

Journal of Environmental Management, Journal Year: 2023, Volume and Issue: 350, P. 119694 - 119694

Published: Nov. 29, 2023

Language: Английский

Citations

16
Ecological Stress Assessment on Vegetation in the Al-Baha Highlands, Saudi Arabia (1991–2023) DOI Open Access

Asma A. Al-Huqail,

Zubairul Islam

Sustainability, Journal Year: 2025, Volume and Issue: 17(7), P. 2854 - 2854

Published: March 24, 2025

Climate change significantly stresses cold-adapted and stenothermic plant species in high-altitude mountain ecosystems. The diverse at elevations ranging from 1324 to 2527 m above mean sea level (AMSL) provide an ideal setting for investigating these impacts the Al-Baha Highlands, Saudi Arabia. Therefore, this study has three aims: first, estimate vegetation cover 2023 its relationship with environmental factors; second, analyze long-term trends (1991–2023) key spectral indices, including normalized difference index (NDVI), water (NDWI), open (NDWIw), land surface temperature (LST), using Kendall tau-b method; third, model ecological stress via a generalized additive (GAM) assess impact on vegetation. We utilized Landsat 5/7/8 (C2 SR T1) indices Copernicus DEM topographic hydrological analysis. results indicate significant roles of LST, elevation, distance seasonal streams shaping patterns (p < 2 × 10−16). There were negative NDVI (91.66 km2), NDWI (138 NDWIw (804 km2) 0.05), whereas LST exhibited positive (116.15 0.05). GAM achieved high predictive accuracy (R2 = 0.979), capturing nonlinear relationships between predictors score. Severe occurred zones (>1700 AMSL) south-facing slopes due increased declining NDWI, impacting such as Juniperus procera. Hypothesis testing was used variations NDVI, trends, highland lower-elevation areas, revealing highly differences 2.2 This provides novel insights into dynamics relation altitude slope aspects, offering actionable recommendations sustainable ecosystem management, targeted reforestation resource optimization mitigate preserve biodiversity.

Language: Английский

Citations

0
Assessing drought risk of grassland ecosystem in Hulunbuir, China DOI

Jiarui Han,

Yinglong Sun,

Feiyun Yang

et al.

Ecological Indicators, Journal Year: 2025, Volume and Issue: 175, P. 113522 - 113522

Published: April 29, 2025

Language: Английский

Citations

0
Measuring the quality and accessibility of urban greenery using free data sources: A case study in Bratislava, Slovakia DOI Creative Commons
Hana Bobáľová, Vladimír Falťan, Alexandra Benová

et al.

Urban forestry & urban greening, Journal Year: 2024, Volume and Issue: 93, P. 128217 - 128217

Published: Jan. 23, 2024

The importance of assessing urban greenery is growing, especially in the context global warming and emergence heat islands. paper proposes a set measurements to evaluate quality accessibility based on freely available geographic data: Sentinel-2 satellite images, Urban Atlas, Open Street Map. (or availability) derived from images by using spectral Forest Index (FI). proposed Neighborhood Green Quality Indexes (NGQI0/30, NGQI350) near far surroundings spatial unit averaging FI values. Accessibility Space (AGSI) measures green spaces (GS) number theoretical functional levels within reach average normalised distance nearest GS across levels. We also propose separately assess parks with amenities through Parks (AUPI). Such areas attract specific groups population, such as elderly people mothers children, who are among most vulnerable during waves. can be applied square grid buildings. A mutual comparison Bratislava, capital Slovakia, confirmed that each measurement captures different characteristics greenery. two other widely used indicators showed achieves highest correlation land surface temperature hot summer days. When evaluating precision NGQI0/30 calculation, Sentinel-2-derived proved sufficient substitute for high-resolution data sources. Since do not require complex calculations hard-to-obtain data, they easily applicable cities.

Language: Английский

Citations

3
Contribution of Climatic Factors and Human Activities to Vegetation Changes in Arid Grassland DOI Open Access

Mengyao Tuo,

Guoce Xu,

Tiegang Zhang

et al.

Sustainability, Journal Year: 2024, Volume and Issue: 16(2), P. 794 - 794

Published: Jan. 17, 2024

Clarifying the changing trend in vegetation and its affecting variables is extremely valuable for natural resource management. Vegetation changes Yinshanbeilu grassland region, which situated centre of Inner Mongolia northern China part arid steppe are sensitive to climatic factors. In this study, we investigated zone from year 2000 2020 using Normalized Difference Index (NDVI) data. The contribution conditions human activities annual growing season was quantified. findings revealed that cover increased at a rate 0.00267/a between 2020. Throughout during season, precipitation had greater influence on growth than other climatological most places, there significant positive correlation NDVI precipitation, negatively correlated with average rates temperature, cumulative sunshine hours, potential evapotranspiration contributed were 0.00173/a, −0.00027/a, 0.00006/a, 0.00074/a, respectively, entire year, 0.00180/a, −0.00001/a, 0.00021/a, 0.00059/a season. impact climate change more pronounced, accounting 84.76% 97.36% change. Humans 15.24% total 2.64% This research’s serve as scientific support preserving environment well an essential reference government decision making.

Language: Английский

Citations

1
Erçek Gölü (Van) Kapalı Havzası Arazi Kullanım ve Arazi Örtüsü Değişiklerinin Uzaktan Algılama Yöntemi Kullanılarak Belirlenmesi DOI
Erkan Dişli, Zehra Sapci

Yüzüncü Yıl Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Journal Year: 2024, Volume and Issue: 29(2), P. 514 - 529

Published: July 23, 2024

Bu çalışmada Erçek Gölü Kapalı Alt Havzası (EGKH) genelinde meydana gelen mekânsal-zamansal değişim süreçlerini belirlemek amacı ile 2006, 2012, 2016, 2018, 2020 ve 2022 yıllarına ait arazi kullanım/arazi örtüsü (AKAÖ) verileri 2020, normalleştirilmiş bitki indeksi (NBÖİ) fark su (NFSİ) kullanılmıştır. AKAÖ, NBÖİ NFSİ haritalarını oluşturmak için ArcGIS 10.8 programında Copernicus-Land Monitoring Service ESRI- Sentinel-2 Land Cover Explorer uydu görüntüleri kullanılmış AKAÖ haritasından elde edilen görüntüler kendi içerisinde yedi alt sınıfa (yerleşim yeri, orman, kütlesi, sulak alan, tarım alanı, çıplak kar/buz örtüsü) ayrılmıştır. görüntülerine göre 2006-2020 yılları arasında yerleşim yeri alanlarında artış ise azalmanın geldiği gözlemlenmiştir. Havza 2016-2022 pozitif (en yüksek) değerlerinin 0.822 0.865 değiştiğini 0.6-1 değer aralığı bazı yıllar dönüşümlü gösterse de sağlıklı veya geniş ormanlık alanların yayılım çok sınırlı kaldığını göstermektedir. yıları negatif düşük) değerleri bir yılında azalış eğilimi gözlenmiştir. EGKH’da en önemli kütlesi olan Gölü’nün alana 110.9 km2 düşük 107.24 sahip olduğu görülmüştür. İlgili göl alanında yaklaşık %2.23 oranında örtüsündeki alanları tarımsal faaliyetleri içerebilecek insan faaliyetlerinin sonucu olarak gösterdiği sonucuna varılmıştır.

Citations

0
Analysis of measurement differences and causes of C, N, and P in river flooding areas—taking the Hailar River in China as an example DOI Creative Commons

Xi Dong,

Chunming Hu

PeerJ, Journal Year: 2024, Volume and Issue: 12, P. e17745 - e17745

Published: July 12, 2024

The Hailar River is located in the Inner Mongolia Autonomous Region of Northeast China. It a connecting hub agricultural pastoral transitional zone on Hulunbuir grassland, with abundant water and biodiversity resources, important ecological conservation significance. This study takes as research area to evaluate impact main influencing factors soil C, N, P measurement from upstream downstream concave convex riverbanks River. results show that: (1) average particle size shows differences downstream: Section 1 31.6–192.3 µm, 2 21–213 3 21–288 4 42–206 µm; pH value generally low, while increases. reason for this that bank has sufficient water, which plays role inhibiting salt content; (2) nutrient content higher region than region, difference between regions relatively small bank; (3) banks mostly positively correlated moisture content, are negatively size. Research shown different cross-sections downstream, well uneven riverbanks, significantly affect physicochemical properties measurements. Studying riparian zones under typical can provide new ideas regional protection even global cycling.

Language: Английский

Citations

0