Spatial Inversion of Soil Organic Carbon Content Based on Hyperspectral Data and Sentinel‐2 Images

Land Degradation and Development, Год журнала: 2025, Номер unknown

Опубликована: Апрель 3, 2025

ABSTRACT Given that Sentinel‐2 (S2) multispectral images provide extensive spatial information and ground‐based hyperspectral data capture refined spectral characteristics, their integration can enhance both the comprehensiveness precision of surface acquisition. This study seeks to leverage these sources develop an optimized estimation model for accurately monitoring large‐scale soil organic carbon (SOC) content, thereby addressing current limitations in multi‐source fusion research. In this study, using mathematical transformation discrete wavelet transform process ground delta oasis Weigan Kuqa rivers Xinjiang, China, combination with S2 image, machine learning algorithms were employed construct models SOC content total variables characteristic variables, inversion oases was carried out. We found R ‐DWT‐H9 significantly correlation between ( p < 0.001). The accuracy constructed based on feature selected by SPA IRIV generally higher than variable models. IRIV‐RFR had highest stable capability. values 2 training validation sets 0.66 0.64, respectively. RMSE 1.5 g∙kg −1 , RPD > 1.4. interior oasis, mainly deficient (61.35%) or relatively (8.17%), while periphery it extremely (30.48%). Combine providing a reference evaluating fertility arid regions.

Язык: Английский

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Mapping the soil C:N ratio at the European scale by combining multi-year Sentinel radar and optical data via cloud computing

Soil and Tillage Research, Год журнала: 2024, Номер 245, С. 106311 - 106311

Опубликована: Сен. 24, 2024

Язык: Английский

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Improved soil organic matter monitoring by using cumulative crop residue indices derived from time-series remote sensing images in the central black soil region of China

Soil and Tillage Research, Год журнала: 2024, Номер 246, С. 106357 - 106357

Опубликована: Ноя. 13, 2024

Язык: Английский

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The Spatiotemporal Characteristics and Driving Factors of Soil Degradation in the Black Soil Region of Northeast China

Agronomy, Год журнала: 2024, Номер 14(12), С. 2870 - 2870

Опубликована: Дек. 1, 2024

The Northeastern Black Soil Region in China is recognized as one of the three major black soil regions globally and often regarded a cornerstone national food security. However, prolonged agricultural practices have led to increasingly severe degradation, mechanisms driving factors behind degradation quality remain unclear. Therefore, this study examines historical current characteristics quality, focusing on influencing factors, such 70-year history reclamation climate change. By accessing different databases, reviewing relevant literature, performing Pearson correlation redundancy analyses (RDA), investigated variation patterns significant indicators their 0–20 cm layer along latitudinal direction (Nenjiang, Beian, Hailun, Harbin) typical region Northeast China. main conclusions are follows: organic matter (SOM) content experienced rapid decline 30 years preceding cultivation (1950~1980), with greatest rate Beian area (about 1.10 g/kg per year). SOM Harbin areas decreased from north south, changing at rates 9.40–21.67 g/kg/degree 0.15–0.34 g/kg/m latitude elevation, respectively. Elevation impacts annual change through its influence mean maximum temperature (AMXT) atmospheric pressure (AP). AMXT AP exhibit linear relationship based which regression models were established. key include (Y), minimum temperatures (AMXT AMNT), relative humidity (ARH), AP. An increase chemical fertilizer application among critical affecting pH. Additionally, extensive use machinery can reduce porosity cause water salt accumulation, ultimately leading This offers theoretical support for mitigating China’s region, thereby contributing security promoting sustainable development.

Язык: Английский

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Raster Scale Farmland Productivity Assessment with Multi-Source Data Fusion—A Case of Typical Black Soil Region in Northeast China

Remote Sensing, Год журнала: 2024, Номер 16(8), С. 1435 - 1435

Опубликована: Апрель 18, 2024

Degradation of black soil areas is a serious threat to national food security and ecological safety; nevertheless, the current lack information on location, size, condition farmland productivity major obstacle development strategies for sustainable utilization resources. We synthesized remote sensing data geospatial thematic construct assessment indicator system assess cropland at regional scale. Furthermore, we conducted research spatial differentiation patterns autocorrelation analysis results. found that within this region exhibited decline pattern from south north, with superior in east as opposed west, distribution follows “spindle-shaped” pattern. Notably, Songnen Sanjiang typical subregions centrally hosted about 46.17% high-quality 53.51% medium-quality farmland, while Mondong subregion west predominantly consisted relatively low-quality productivity. Additionally, displayed significant positive correlation clustering, more pronounced fluctuations northeast–southwest direction. The developed can illustrate thereby offer valuable reference management

Язык: Английский

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Mapping Topsoil Carbon Storage Dynamics of Croplands Based on Temporal Mosaicking Images of Landsat and Machine Learning Approach

Remote Sensing, Год журнала: 2024, Номер 16(11), С. 2010 - 2010

Опубликована: Июнь 3, 2024

Understanding changes of soil organic carbon (SOC) in top layers croplands and their driving factors is a vital prerequisite decision-making for maintaining sustainable agriculture. However, high-precision estimation SOC at regional scale still an issue to be solved. Based on samples, synthetic image bare geographical data, this paper predicted density using Random Forest model the Black Soil Region Jilin Province, China 2005 2020, analyzed its influencing factors. Results showed that random forest integrates composite images improve accuracy robustness prediction. From total storage decreased from 89.96 82.79 Tg C with annual decrease 0.48 yr−1. The mean value 3.42 3.32 kg/m2, high values are distributed middle parts. Changes represented significant heterogeneity spatially. 62.14% greater than 4.0 kg/m2 significantly, 38.60% between 2.5 3.0 significantly increased. Climatic made great contributions density, however, relative importance (RI) 44.65% 37.26% during study period. Synthetic constituted 23.54% 26.29% RI prediction, respectively, contribution each band was quite different. RIs topographic vegetation were low but increased 2020. This can aid local land managers governmental agencies assessing sequestration potential credits, thus contributing protection use black soils.

Язык: Английский

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Alfalfa Increases the Soil N Utilization Efficiency in Degraded Black Soil Farmland and Alleviates Nutrient Limitations in Soil Microbes

Agronomy, Год журнала: 2024, Номер 14(10), С. 2185 - 2185

Опубликована: Сен. 24, 2024

Alfalfa (Medicago sativa L.) can fix N naturally within soils, which makes alfalfa cultivation useful for enhancing soil fertility while minimizing environmental impacts from pesticides, fertilizers, and pollution. To assess the influence of cropping on degraded black soil, we determined nutrient stoichiometry microbial biomass under four corn systems at Harbin Corn Demonstration Base (Heilongjiang, China), is located in Wujia (126°23′ E, 45°31′ N), Shuangcheng district, Harbin, Heilongjiang Province. The included continuous more than 30 years (CK), 2 alfalfa–corn rotation (AC), three (TA), (FA). Overall, AC, TA, FA treatment increased pH, reduced salinity, organic matter content 0–15 cm layer. TA presented levels comparable to those cornfields that were fertilized annually. treatments available N:P, C:P ratios. Moreover, significantly P (SMBP) (surface) layer C (SMBC):SMBP ratio. storage mineralization rates alleviated limitations farmland. Compared with FA, resulted greater improvements quality ability enhance an important component sustainable agricultural practices aimed rehabilitating soils.

Язык: Английский

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Soil Aggregates and Water Infiltration Performance of Different Water and Soil Conservation Measures on Phaeozems Sloping Farmland in Northeast China

Agronomy, Год журнала: 2024, Номер 14(10), С. 2410 - 2410

Опубликована: Окт. 17, 2024

The enhancement of soil erosion resistance via and water conservation practices is a necessary venture in the modern agricultural industry. Soil infiltration performance, as indicator resistance, closely related to aggregates. However, relationship between C/N ratio aggregates overall performance under tillage unclear. Experiments were conducted 2022 2023 observe carbon nitrogen distribution patterns sloping cultivated land different practices. In this study, ridge pitting field + subsoiling (RF-S) contour (TP-S) have been used plot experiment, with down-slope cultivation (CK) control. results showed that stability aggregates, organic total contents particle-sizes, greatly increased RF-S TP-S treatments (up-slope, mid-slope, down-slope). Compared CK, significantly improved at slope positions (on, in, slope) particle sizes >2 mm 2–0.25 mm. more effectively reduced deposition macroaggregates down can comprehensively improve performance. mean weight diameter (MWD) geometric (GMD) reflect also indicate structure. MWD by 6% 17.7%, GMD 9.7% 27.2%, average rate 41.8% 78.3%, initial 19.1% 46.6%, stable 109.2% 165.9%. positively correlated negatively <0.25 study show reasonable measures are helpful improving anti-erosion ability illustrate influence mechanism on

Язык: Английский

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Grazing exclusion is more beneficial for restoring soil organic carbon and nutrient balance than afforestation on degraded sandy land

Frontiers in Plant Science, Год журнала: 2023, Номер 14

Опубликована: Дек. 21, 2023

Introduction Vegetation restoration is an effective measure to improve the ecosystem service of degraded sandy land ecosystem. However, it unclear how vegetation on severely desertified affect soil organic carbon (SOC) sequestration and nutrients balance. Therefore, this study was designed clarify response SOC, total nitrogen (TN), phosphorus (TP), resulting stoichiometric ratios (C:N:P) afforestation grazing exclusion, quantify their dynamics over time. Methods We conducted community investigation sampling in natural sparse-forest grassland (the climax stage), ( Pinus sylvestris var. mongolica (40-year, 48-year), Caragana microphylla (20-year, 40-year)), exclusion 40-year) China’s Horqin Sandy Land. Soil C:N:P stoichiometry its driving factors under different measures were then studied. Results Afforestation significantly p &lt; 0.05) increased TN, TP concentrations. C:N, C:P, N:P ratios, indicating that nutrient limitations may occur later stages restoration. The after a 40-year closest those grassland. from 3.1 4.1 with increasing age (from 20 40 years), which close national mean values (4.2). Moreover, lead water deficit surface soil. main factor leading changes stoichiometry, indirectly affects by altering structure chemical properties. Conclusion In terms ecological more conducive restore SOC balance than land. Due poor nutrients, attentions should be paid conditions Those findings can provide valuable information for semi-arid areas.

Язык: Английский

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Improvement of Soil Pore Distribution and Soil Moisture Content using Organic Matter Addition Technology

Indian Journal of Agricultural Research, Год журнала: 2024, Номер Of

Опубликована: Июнь 11, 2024

Background: Coffee plants in Sumbermanjing Wetan are commonly cultivated on dry lands that rely solely rainfall as the source of water input eventually makes them susceptible to climate change. The deficiency organic material and availability for these poses a significant challenge coffee farmers Wetan. Therefore, research was conducted investigate addition various matter through biopore infiltration holes plantations with following objectives: i) analyze impact applying distribution soil pores ii) examine effect application moisture content. Methods: carried out Smallholder Plantation Argotirto Village, District, Malang Regency. A randomized block design implemented five treatment groups, which included control (P1), two + manure (P2), compost (P3), green (P4) surface-applied (P5), each repeated three times. observed variables percentage matter, pore distribution, available capacity Result: findings indicated enhanced content, where P4 (two manure) exhibiting highest values first third months after application. increased porosity all treatments, showing capacity. This suggests utilization can improve aggregation, thus increasing Consistently, content at depth 40-60 cm tended increase month application, indicating enhance subsoil.

Язык: Английский

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