Catena最新文献

{"title":"Effects of water erosion on wind erosion studied in rain simulator and wind tunnel on silty material taken from the Chernozem","authors":"Haiyu Li ,&nbsp;Wei Hu ,&nbsp;Mingming Guo ,&nbsp;Xingyi Zhang ,&nbsp;Meiyue Wang ,&nbsp;Meng Li","doi":"10.1016/j.catena.2025.109063","DOIUrl":"10.1016/j.catena.2025.109063","url":null,"abstract":"<div><div>Composite erosion resulting from both water and wind poses a significant challenge to croplands in the Songnen Plain, located in northeast China, resulting in substantial soil degradation and loss of fertility. Nonetheless, the factors driving the effect of water erosion on wind erosion remain unclear. To address this, the study conducted controlled laboratory experiments that simulated conditions of rainfall and wind. Moreover, soil samples were exposed to rainfall intensities of 0, 50, and 100 mm h⁻¹, followed by wind tunnel tests with wind velocities of 9 m s⁻¹, 12 m s⁻¹, and 15 m s⁻¹. We subsequently assessed wind erosion characteristics and measured the soil properties of the residual surface soil in the trough. Our findings indicated that higher rainfall intensity significantly decreased the intensity of wind erosion by 42.3 %-85.5 % at 50 and 100 mm h⁻¹. Additionally, sediment transport height decreased by 4–10 cm across distinct rainfall intensities. Water erosion increased soil shear strength and compactness by 1.9 to 2.4 times and 2.8 to 4.8 times, respectively. Except for that, the clay content decreased by 14.2 %-39.2 % with different rainfall intensities and wind velocities. Moreover, the proportion of aggregates smaller than 0.25 mm decreased with increasing wind velocities. The contents of C, N, and CaCO₃ also diminished with higher wind velocity and rainfall intensity. Structural equation modeling analysis demonstrated that rainfall intensity indirectly influenced wind erosion intensity by altering soil properties. Meanwhile, rainfall intensity exhibited the strongest direct and indirect negative effects on sediment transport height. A nonlinear empirical equation for soil wind erodibility parameters (<em>K</em>) based on clay content was established, incorporating soil shear strength, CaCO₃ content, and rainfall intensity. This study offers a theoretical foundation for developing effective soil conservation strategies in the Songnen Plain.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"256 ","pages":"Article 109063"},"PeriodicalIF":5.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relief, soil and tree community attributes jointly shape liana community structure and diversity in a Neotropical rainforest landscape","authors":"Iván Leonardo Ek-Rodríguez ,&nbsp;Armando Navarrete-Segueda ,&nbsp;Christina Siebe ,&nbsp;Jorge A. Meave ,&nbsp;Gilberto Vela-Correa ,&nbsp;Guillermo Ibarra-Manríquez","doi":"10.1016/j.catena.2025.109017","DOIUrl":"10.1016/j.catena.2025.109017","url":null,"abstract":"<div><div>Lianas are a fundamental component of tropical forests. Yet, their complex environmental interactions challenge our understanding of the variability in liana community attributes, which requires the integration of multiple environmental factors. We asked how relief, soil and tree community structure drive liana community assembly in a tropical rainforest of eastern Mexico. Using a geopedological approach, we established fifteen 0.5-ha plots across a complex landscape to census all lianas with basal diameter ≥ 1 cm. Additionally, we estimated slope, elevation, soil physicochemical properties, and tree community structural attributes, and related these factors to liana community structure and diversity. A principal component analysis showed that the main gradients of environmental variation (explained variance, PC1 = 37.3 %, PC2 = 19.6 %, PC3 = 14.6 %) are related to slope steepness, elevation, clay fraction, tree basal area, and the proportion of pioneer trees. By using these axes as explanatory variables in generalized linear models (GLMs), we found a significant relationship with liana abundance in the community, liana diameters and diversity. Moreover, the response of liana abundance to environmental heterogeneity varied among species. To advance our understanding of the mechanisms underlying liana community assembly in highly diverse forests, it is necessary to jointly assess the effects of multiple factors involved in liana performance and to account for the differential responses of liana species to environmental heterogeneity.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109017"},"PeriodicalIF":5.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The surface features and internal structure of an integrated open system pingo in the source area of the Yangtze River on the Qinghai-Tibet Plateau","authors":"Guangyue Liu ,&nbsp;Yao Xiao ,&nbsp;Guojie Hu ,&nbsp;Tonghua Wu ,&nbsp;Xiaodong Wu ,&nbsp;Lingxiao Wang ,&nbsp;Changwei Xie ,&nbsp;Defu Zou ,&nbsp;Erji Du ,&nbsp;Yonghua Zhao ,&nbsp;Yingying Lu ,&nbsp;Lin Zhao","doi":"10.1016/j.catena.2025.109070","DOIUrl":"10.1016/j.catena.2025.109070","url":null,"abstract":"<div><div>The Qinghai-Tibet Plateau was traditionally deemed unsuitable for large-scale perennial frost mound developing due to climatic and geological constraints. A mound-like geomorphological feature was found in the source area of the Yangtze River in 2020. We conducted a comprehensive investigation to explore its surface features and internal structure, with photogrammetry, drilling, geophysical survey, and ground temperature measurement, and then it was identified as an open system pingo. The pingo was situated at 4860 m above sea level, and was characterized by an irregular conical shape with a 9.5-meter height, a basal diameter of 110 m, and a slope angle of less than 30°. Frost cracks were developed on the top of the mound, indicating extensive surface deformation there. A 10.5 m-thick ice core just beneath the active layer, and a 6.3 m-thick water lens below were found during the drilling of the borehole. The underlying artesian aquifers were considered to play a pivotal role in the geomorphological formation, providing both water source and uplift pressure through bottom-up injection of groundwater. Further analysis suggested that the presence of suitable hydrogeological conditions for the emergence of similar large-scale frost mounds in this region, with potential for multiple pingos or pingo scars in the vicinity. The finding offers novel insights into the research on permafrost and periglacial geomorphology in the Qinghai-Tibet Plateau, enhancing understanding of the formation mechanism of perennial frost mounds and the way of deep groundwater storage and migration under the unique periglacial environment of the plateau, and also provides a terrestrial parallel for exploration of pingo-like features and relevant water activities on other planets like Mars.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109070"},"PeriodicalIF":5.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving in-situ spectral estimation of wetland soil organic carbon by integrating multiple optimization strategies","authors":"Hongyi Li ,&nbsp;Jiangtao Yang ,&nbsp;Bifeng Hu ,&nbsp;Yibo Geng ,&nbsp;Qian Zhu ,&nbsp;Yongsheng Hong ,&nbsp;Yi Lin ,&nbsp;Jie Peng ,&nbsp;Wenjun Ji ,&nbsp;Songchao Chen ,&nbsp;Zhou Shi","doi":"10.1016/j.catena.2025.109078","DOIUrl":"10.1016/j.catena.2025.109078","url":null,"abstract":"<div><div>Carbon in wetlands is a critical component of the terrestrial carbon pool in the global carbon cycle. Accurate quantification of wetland soil organic carbon (SOC) is essential for sustainable wetland management and climate change mitigation. However, this effort is often hampered by the inaccessibility of wetlands and high economic and labor costs associated with data acquisition. The advent of visible and near–infrared (Vis-NIR) spectroscopy offers a time- and cost-effective method for monitoring SOC content. Considerable efforts have been directed toward estimating wetland SOC using Vis-NIR spectroscopy. However, great differences were reported for the performance of different predictive strategies, which pose confusion in the choice of methods when using Vis-NIR spectroscopy to estimate SOC. Therefore, this study aims to improve the in-situ spectral estimation accuracy of wetland SOC by testing and evaluating 240 optimization strategies which integrate different pre-treatment technologies, moisture removal algorithms, spectral feature selection methods. Our findings indicate that the optimal strategy involved the combination of first-order derivative (1stD), external parameter orthogonalization (EPO), modified greedy feature selection (MFGS), and one-dimensional convolutional neural network (1D-CNN), yielding <em>R²</em>, RPD, RMSE values of 0.94, 4.15, and 1.09 g/kg, respectively. For pre-treatment technologies, 1stD outperformed Savitzky-Golay (SG) and log(1/reflectance) (Log(1/R)). EPO emerged as the optimal moisture removal algorithm, effectively reducing the interference of moisture and other environmental factors. Among spectral feature selection methods, the competitive adaptive reweighting algorithm (CARS) outperformed Boruta, MFGS, and interval random frog (IRF). In terms of prediction models, the 1D-CNN model significantly outperformed partial least squares regression (PLSR) and random forest (RF), with markedly higher accuracy (averaged R² = 0.83, RPD = 2.74, RMSE = 1.76 g/kg). Findings from this research could guide future studies in selecting the optimization strategies to more accurately estimate wetland SOC via Vis-NIR spectroscopy.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109078"},"PeriodicalIF":5.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trade-off between soil carbon and water following revegetation across climatic gradients on the Loess Plateau","authors":"Zhuoya Meng ,&nbsp;June Liu ,&nbsp;Liguo Cao ,&nbsp;Bin Li ,&nbsp;Ning Wang ,&nbsp;Mingyu Chen ,&nbsp;Zhengchao Zhou","doi":"10.1016/j.catena.2025.109071","DOIUrl":"10.1016/j.catena.2025.109071","url":null,"abstract":"<div><div>Vegetation restoration effectively combats land degradation and mitigates climate change by enhancing soil carbon sequestration. However, it often depletes soil water storage (SWS), potentially threatening ecosystem sustainability in arid and semi-arid regions. Although evidence shows that climate and vegetation type profoundly shape soil carbon–water interactions, the underlying mechanisms remain poorly understood. This study analyzed data from 174 observations to assess soil organic carbon storage (SOCS) and SWS (0–500 cm), their trade-offs, and the coupling coordination level (0–100 cm) across vegetation types, including grassland, shrubland, and forestland (<em>Robinia pseudoacacia</em> and economic forests) on the Loess Plateau. The findings revealed an optimal trade-off between SOCS and SWS in forestland, with economic forests slightly outperforming <em>Robinia pseudoacacia</em>. Grassland and shrubland exhibited less favorable outcomes. Within the 0–500 cm soil layers, economic forests demonstrated the highest levels of both SOCS (20.20 kg m⁻²) and SWS (857.95 mm), whereas <em>Robinia pseudoacacia</em> had higher SOCS (19.36 kg m⁻²) but lower SWS (574.64 mm). Grassland had lower SOCS (13.00 kg m⁻²) and higher SWS (634.65 mm), while shrubland had the lowest levels of both SOCS (12.55 kg m⁻²) and SWS (480.17 mm). The effect of precipitation and temperature on the carbon–water relationship was non-linear. Based on these results, the revegetation recommendations included grassland for areas with a mean annual precipitation (MAP) &gt; 450 mm, and mean annual temperature (MAT) &lt; 9 °C; shrubland for MAP between 450 and 500 mm, and MAT &lt; 9 °C; <em>Robinia pseudoacacia</em> for MAP &gt; 530 mm, and MAT between 9 °C and 10 °C; and economic forests for MAP between 450 and 530 mm, and MAT &gt; 10 °C. These findings underscore the pivotal role of vegetation type and climate in regulating soil carbon–water dynamics and help identify optimal climatic zones for different vegetation types on the Loess Plateau.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109071"},"PeriodicalIF":5.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling chemical and physical processes in Fourier transform spectra of low frequency dissolved oxygen time series in Swiss lakes","authors":"Juan-Carlos Rodríguez-Murillo ,&nbsp;Montserrat Filella","doi":"10.1016/j.catena.2025.109073","DOIUrl":"10.1016/j.catena.2025.109073","url":null,"abstract":"<div><div>Frequency domain analysis of hydrological time series can be used to extract information on physical and chemical processes, but such analyses are lacking for low frequency (fortnightly or monthly) time series of concentrations of lake constituents. We have explored the potentiality of these usual frequency time series in understanding processes in lakes. To this end, we have calculated Fourier transform spectra for dissolved oxygen time series at 14 sampling stations of 11 Swiss lakes for the approximate period 1980-2010. Despite noisy spectra, and spectral slopes (α) with a wide range of uncertainty, we have found consistent patterns of α change with the position in the lake and depth of the sampling stations. Spectral power (SP) shows a dependence of power on frequency (f) of the type SP ∝ f^-α with α varying from -0.103 to 1.40. α increases with depth and with distance from the main lake inlet up to 1-1.40. Spectral slopes have a significant parabolic relationship with mean oxygen at each depth (r² = 0.285, N = 182, p &lt; 10^-4), indicating the influence of mixing processes in the lakes. Regression results of α with water travel time from the main lake inlet -’processing time’- and the square of dissolved oxygen concentration (r² = 0.363, N = 182, p &lt; 10^-4) suggest that surface α are sensitive to the rate of recalcitrant dissolved organic matter decomposition, meaning that only processes with rates within the frequency range of the spectra (7.45x10^-5 to 0.028 d^-1) can exert a visible effect on the spectra and α. Potentially, effects on α variation can be used to detect or characterise slow processes in lakes for other compounds using long-term time series.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109073"},"PeriodicalIF":5.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Water erosion control through vegetation restoration: Mechanisms and contributions of vegetation components in Robinia Pseudoacacia forests","authors":"Yang Li ,&nbsp;Yawei Hu ,&nbsp;Jiongchang Zhao ,&nbsp;Jianjun Zhang","doi":"10.1016/j.catena.2025.109066","DOIUrl":"10.1016/j.catena.2025.109066","url":null,"abstract":"<div><div>Soil erosion represents a critical environmental challenge, with vegetation restoration recognized as an effective biological strategy for mitigating water erosion. However, much research has examined how vegetation components regulate water erosion in grassland ecosystems, but these conclusions may not apply to more complex forest ecosystems. This study investigated 42 typical <em>Robinia pseudoacacia</em> forest plots, assessing water erosion characteristics under four scenarios: full vegetation components including grass canopy, litter layer and shallow roots (GLR), retention of litter layer and shallow roots (LR), retention of shallow roots only (R), and no vegetation components (N). These characteristics involved average flow velocity (<em>V</em>), Reynolds number (<em>R_e</em>), Froude number (<em>F_r</em>), Weisbacher-Darcy resistance coefficient (<em>f</em>), sediment concentration (<em>C</em>), soil loss rate (<em>SLR</em>), runoff shear stress (<em>τ</em>), runoff power (<em>W</em>), and critical runoff shear stress (<em>τ_c</em>). Contributions of the grass canopy, the litter layer, and the shallow roots in mitigating water erosion were quantified. The aim of this study is to analyze the influence of each vegetation component separately on soil erosion. The results indicated that the grass canopy significantly increased <em>f</em> and <em>τ_c</em>. The litter layer substantially reduced <em>V</em>, <em>R_e</em>, <em>F_r</em>, <em>C</em>, <em>SLR</em>, and <em>W</em>, while increasing <em>F</em>, <em>τ</em>, and <em>τ_c</em>. The shallow roots significantly reduced <em>V</em>, <em>R_e</em>, <em>F_r</em>, <em>C</em>, and <em>SLR</em>, while increasing <em>τ</em> and <em>τ_c</em>. Litter layer exerted a more pronounced impact than shallow roots and grass canopy, possibly attributed to the substantial litter biomass. Promoting the formation and accumulation of litter layer, along with shallow roots supporting, helps to optimize the soil and water conservation functions of forest ecosystems. These findings enhance understanding of the mechanisms and contributions of vegetation components in controlling water erosion on the Loess Plateau, particularly within complex forest ecosystems.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109066"},"PeriodicalIF":5.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interplay of grazing intensity and topography on soil phosphorus dynamics in semiarid grasslands","authors":"Qi Sun ,&nbsp;Ruoyu Jia ,&nbsp;Jianqing Tian ,&nbsp;Yujin Zhao ,&nbsp;Zhisheng Wu ,&nbsp;Entao Zhang ,&nbsp;Jishuai Su ,&nbsp;Yang Wang ,&nbsp;Xiaoming Lu ,&nbsp;Yongfei Bai","doi":"10.1016/j.catena.2025.109072","DOIUrl":"10.1016/j.catena.2025.109072","url":null,"abstract":"<div><div>The bioavailability of soil phosphorus (P) fractions is essential for sustaining primary productivity in grassland ecosystems, and it is influenced by grazing intensity and topographical features. However, the specific effects of grazing intensity on soil P fractions across varying topographies remain largely unexplored. Here, we utilized a 14-year grazing manipulation experiment in a semi-arid grassland, which included two topographical settings (flat vs. slope) and seven levels of grazing intensity (0 to 9.0 sheep ha⁻¹), to investigate how these factors impact the storage and transformation of soil P fractions. Soil P fractions were categorized into labile P (Ca₂-P), moderately labile P (Ca₈-P, Al-P, Fe-P), and stable P (O-P, Ca₁₀-P). Our results demonstrate that high grazing intensities lead to the accumulation of labile and moderately labile P fractions on flat areas due to runoff deposition from adjacent slopes, while these fractions are depleted on slopes themselves. Grazing exerts a direct influence on topsoil by reducing vegetation and litter cover, which accelerate the conversion of labile P fractions into more stable forms due to increased exposure and diminished protection. The mechanisms by which grazing impacts the distribution and dynamics of soil P fractions differ according topographical features. In flat areas, biochemical processes driven by soil organic carbon and microbial communities are predominant, resulting an initial decrease and followed by an increase in the proportion of less stable P with rising grazing intensity. Conversely, on slopes, environmental factors, particularly soil pH, play a more dominant role, leading to an initial increase followed by a decrease in the proportion of less stable P as grazing intensity escalates. These findings highlight the complex interplay between grazing intensity and topography in shaping soil P dynamics. Understanding these interactions is crucial for developing effective grazing management strategies and promoting sustainable grassland productivity in semi-arid environments.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109072"},"PeriodicalIF":5.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uniformity and variance in the effects of moss crusts on soil properties, enzyme activities, and bacterial communities along a subtropical karst degradation gradient","authors":"Xiaona Li ,&nbsp;Xin Zhao ,&nbsp;Dong Chen ,&nbsp;Guanting Guo ,&nbsp;Jiaojiao Wu ,&nbsp;Mingzhong Long ,&nbsp;Qimei Wu ,&nbsp;Dengfu Wang ,&nbsp;Hong Jiang ,&nbsp;Linmei Long","doi":"10.1016/j.catena.2025.109064","DOIUrl":"10.1016/j.catena.2025.109064","url":null,"abstract":"<div><div>Research on biocrusts in degraded subtropical karst ecosystems remains limited, and the few reports that are available focus on only one small area. Here, we assessed the effects of moss crusts on soil physicochemical properties, enzyme activities, and bacterial communities in four subtropical karst ecosystems experiencing varying degrees of degradation. We also explored the response mechanisms underlying moss crusts’ ecological functions along the same eco-degradation gradient. Our results indicate that moss crusts influence soil enzyme activities and physicochemical properties in the same way in each of the four karst ecosystems, regardless of the degree of degradation: moss crusts significantly improved soil physicochemical properties and enhanced aggregate stability (soil organic carbon, total nitrogen, alkali-hydrolyzable nitrogen, available kalium, silt + clay content, and soil aggregate mean weight diameter) and enzyme activities (N-acetyl-β-D-glucosidase, leucine aminopeptidase, β-glucosidase, and sucrase). Moss crusts greatly enhanced soil bacterial community species richness, except in HF with a much lower pH (5.35∼6.08), suggesting that the connection between moss crusts and bacterial species richness is most relevant in weakly alkaline (HJ and KD) and nearly neutral (YT) karst environments. Soil enzyme activities and chemical properties are more dominant drivers influencing bacterial communities within moss crusts in karst ecosystems with different degrees of degradation. Furthermore, moss crusts significantly enhanced the stability and complexity of soil bacterial networks in all study areas except HF. The influence of moss crusts on soil properties (total nitrogen, mean weight diameter, and sucrase) and bacterial network structure became stronger with an increasing degree of degradation, and interactions between soil bacterial taxa tended to become increasingly cooperative. This study deepens our understanding of the ecological functions of moss crusts in different ecosystems and offers a theoretical reference for the study of how biocrusts and their ecological functions respond to global climate change.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109064"},"PeriodicalIF":5.4,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impacts of spatial resolutions of UAV-LiDAR-derived DEMs on erosion modelling in the hilly and gully Loess Plateau","authors":"Wenli Li ,&nbsp;Pengfei Li ,&nbsp;Lu Yan ,&nbsp;Jinfei Hu ,&nbsp;Leiqin Wang ,&nbsp;Dou Li ,&nbsp;Yang Dan ,&nbsp;Linlin Huang ,&nbsp;Guangju Zhao","doi":"10.1016/j.catena.2025.109059","DOIUrl":"10.1016/j.catena.2025.109059","url":null,"abstract":"<div><div>High resolution Digital Elevation Models (DEMs) (e.g. &lt;10 m) are critical for deriving topographic variables and thus erosion modelling. However, impacts of varying high DEM resolutions on erosion modelling results have been rarely assessed, particularly for topographically complex areas. In this study, DEMs with varying resolutions (0.1−20 m) were generated based on 3D point clouds acquired by Unmanned Aerial Vehicles Light Detection and Ranging (UAV-LiDAR) for a small catchment in the hilly and gully Loess Plateau. Water and Tillage Erosion Model and Sediment Delivery Model (WaTEM/SEDEM) was employed to simulate erosion processes at different resolutions, with results at 20 m resolution being validated based on differencing results of UAV-LiDAR-derived DEMs. Impacts of DEM resolutions on topographic factors extracted and modelling results for different geomorphic units were investigated, with results at 20 m resolution as a benchmark. Model validation demonstrated that WaTEM/SEDEM was able to fairly simulate soil erosion and deposition in the study catchment (0.51 ≤ NSE &lt; 0.6, r = 0.75). Results showed that, as DEM resolutions coarsened, average slope gradient decreased, slope length, slope steepness and slope length (LS) factor and soil erosion volume increased, while sediment deposition volume firstly increased then decreased. Spatial patterns of erosion and deposition simulated at different resolutions showed a moderate consistency to those associated with benchmark resolution (0.46 &lt; Kappa coefficient &lt; 0.51), and the consistency increased as the resolution approached the benchmark. Impacts of DEM resolutions on the derived slope gradient, slope length, LS factor, and soil erosion volume over the study catchment were greater than those for hillslopes while less than those for gully slopes, while the impacts on deposition were also greater on gully slopes than over the catchment. The impacts on sediment yield were more complicated as a combined effects on erosion and deposition.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"255 ","pages":"Article 109059"},"PeriodicalIF":5.4,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}