Catena最新文献

{"title":"Microbial associations with soil organic carbon pool composition and stabilization in eroding landscapes","authors":"Yumei Peng,&nbsp;Yuxin Yan,&nbsp;Zhongmin Fan,&nbsp;Jia Shi,&nbsp;Chunpeng Huo,&nbsp;Ziyun Zhang,&nbsp;Xiang Wang","doi":"10.1016/j.catena.2025.109302","DOIUrl":"10.1016/j.catena.2025.109302","url":null,"abstract":"<div><div>The persistence of soil organic carbon (SOC), particularly in deeper soils, plays a crucial role in global carbon storage and sequestration. However, the microbial mechanisms underlying carbon sequestration in eroding agricultural landscapes remain unclear. This study investigated SOC formation pathways of under soil erosion, focusing on dissolved organic carbon (DOC) and microbial necromass carbon (MNC), and mineral-associated organic carbon (MAOC) in the topsoil (0–20 cm) versus subsoil (80–100 cm). Results showed that SOC mineralization rates were significantly lower at depositional compared to eroding sites, with reductions of 40.7 % in topsoils and 70.6 % in subsoils. This decline correlated with synergistic alterations in DOC chemistry and microbial processes. At depositional zones, enrichment of aromatic recalcitrant DOC alonged with a 233.6 % increase in subsoil microbial necromass carbon (MNC), where fungal-derived residues became the dominant contributor to MAOC stabilization. Microbial life-strategy reorganization drove these changes, with depositional topsoils showing increased abundances of r-strategist Proteobacteria (+24.0 %) and Gemmatimonadota (+27.4 %)—groups that facilitate rapid substrate utilization—while K-strategist Acidobacteriota decreased by 47.9 %. Although microbial carbon use efficiency was slightly higher at depositional locations, mineral protection of necromass and persistence of aromatic DOC emerged as the primary stabilization mechanisms. Thus, erosion–deposition vertically redistributes SOC persistence through microbially mediated necromass accumulation and mineral complexation, necessitating the integration of microbial functional traits into stratified carbon models.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109302"},"PeriodicalIF":5.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656165","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":"Spatial distribution and environmental drivers of iron-bound organic carbon in coastal wetlands across climatic gradients","authors":"Manlin Su ,&nbsp;Linke Zheng ,&nbsp;Xiaoting Zhang ,&nbsp;Hualong Hong ,&nbsp;Tseyu Chu ,&nbsp;Zhanyi Shen ,&nbsp;Haoliang Lu","doi":"10.1016/j.catena.2025.109298","DOIUrl":"10.1016/j.catena.2025.109298","url":null,"abstract":"<div><div>The biogeochemical coupling of iron (Fe) and organic carbon (OC) in coastal wetlands is a crucial yet underexplored process for blue carbon stabilization, with iron-bound organic carbon (Fe-OC) serving as an efficient preservation mechanism due to its resistance to degradation. Despite its significance, large-scale studies investigating the latitudinal distribution of Fe-OC and its environmental drivers across varying climatic regimes remain limited. To address this gap, we integrated field surveys, isotopic analyses, and multivariate modeling across <em>Spartina alterniflora</em>-dominated wetlands spanning 14° latitude in eastern China to investigate Fe-OC variability and primary drivers. The results showed that Fe-OC concentrations ranged from 0.17 to 2.13 mg g^–1, showing a significant decline in concentration as latitude increases. Fe-OC concentrations were highest in the surface layer (10–20 cm) and decreased with depth, indicating a vertical stratification pattern. Fe-OC contributed 8.74 % to 41.67 % of soil organic carbon (SOC), with a molar OC/Fe ratio of 1.14 ± 0.69, indicating adsorption as the primary binding mechanism between reactive iron oxides and organic matter. δ¹³C isotopic analyses revealed that Fe-OC was enriched in ¹³C compared to SOC, indicating a higher proportion of marine-derived organic carbon inputs. Multivariate analyses identified key climatic factors, such as temperature and precipitation, along with soil properties (pH, clay content, and concentrations of calcium and aluminum ions) as the primary factors controlling Fe-OC storage. By clarifying how Fe-OC deposition and distribution shift with climate and revealing the iron-mediated processes that stabilize blue carbon, this study provides a data-driven basis for monitoring and targeted management of coastal-wetland blue carbon under future climate scenarios.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109298"},"PeriodicalIF":5.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656254","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":"Geomorphological control on the palaeosol evolution in an Upper Cretaceous distributive fluvial system (Bauru Basin, Brazil)","authors":"Alessandro Batezelli ,&nbsp;Francisco Sergio Bernardes Ladeira ,&nbsp;Leidy Alexandra Delgado Blanco ,&nbsp;Márcio Luiz da Silva ,&nbsp;Taynah Buratto Rebelo","doi":"10.1016/j.catena.2025.109278","DOIUrl":"10.1016/j.catena.2025.109278","url":null,"abstract":"<div><div>In the last three decades, palaeopedology has been used as a critical methodology for the study of fluvial systems, allowing the identification of specific features related to non-depositional times (such as tectonic, climate, topography, and organisms). The Marília Formation records the distributive fluvial system (DFS) stage of the Bauru Basin (Southeastern Brazil) during the Maastrichtian, dominated by braided river deposits. Based on the relationship between facies and palaeosols, the present work proposes an environmental evolution and estimates the rate of sedimentation and pedogenesis in the Late Cretaceous of Southeast Brazil. By studying bi-dimensional sections, we identified facies associations that compound four main architectural elements: channels (CH), laminated sand sheet (LS), sand bars (SB) and overbank deposits (OF). The sedimentary dynamics were marked by the building and abandoning of channel complexes related to aggradation, carbonate palaeosols generation, clay illuviation, and vegetation growth within the channels. Fifteen palaeosol profiles occur intercalated in the deposits. They are characterised by horizons Bt, Btk, Bss, C, and Ck, which allows a possible general comparison with the present soil orders: Alfisols, Aridisols, Entisols, and Vertisols. The macro- and micromorphological characteristics, combined with the mineralogy of these horizons, indicate arid and semiarid climatic conditions, with the minimum time of profile formation varying from 3740 to 5000 years. The genetic relationship between architectural elements, palaeosols, and the piling pattern suggests that the Marília Formation resulted from a succession of high-frequency depositional events of 10³ to 10⁴ years. This approach may allow an understanding of the avulsion and pedogenesis processes in the distal distributive fluvial systems.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109278"},"PeriodicalIF":5.4,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656581","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 impact of natural and anthropogenic factors on erosion in the Northeastern loess Plateau, China, during the past 10,000 years","authors":"Niannian Fan ,&nbsp;Guoxuan Ma ,&nbsp;Yu An ,&nbsp;Jim Best ,&nbsp;Junping Wang ,&nbsp;Yuqi Zhao ,&nbsp;Chengshan Wang ,&nbsp;Yuanjian Wang ,&nbsp;Ruihua Nie ,&nbsp;Xingnian Liu","doi":"10.1016/j.catena.2025.109292","DOIUrl":"10.1016/j.catena.2025.109292","url":null,"abstract":"<div><div>The Loess Plateau in China is the birthplace of ancient Chinese cultures and one of the most significantly eroded areas in the world because of its geology and anthropogenic history. However, our understanding of the variations in erosion on the Loess Plateau over the past 10,000 years, and how these variations have been influenced by natural and anthropogenic factors, remains incomplete. Our study uses data from detrital zircons in fluvial deposits to reconstruct the history of loess erosion in the Yongding River catchment over the past ∼ 10 ka, which allows the influence of natural and human factors to be investigated. Before 2.9 ka, the sediment transport flux increased slowly, and human activities were minor but subsequently began to increase at a faster rate. The destruction of forests and grasslands, together with changes in agricultural practices, likely played significant roles, especially after the Yuan Dynasty established the capital in Beijing (1267 CE). Since this time, anthropogenic activities have dramatically increased sediment yield in the Yongding River catchment, with this increase continuing until the first half of the 20th century, when the sediment flux was <em>ca</em>. 4.3 times greater than the background value before 2.9 ka. After the 1950s, due to the influence of reservoir construction and reforestation policies, sediment transport in the Yongding River catchment decreased sharply. The present study contributes to a better understanding of the temporal patterns of erosion on the Loess Plateau due to natural processes and anthropogenic stresses, which could inform and benefit future river basin management.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109292"},"PeriodicalIF":5.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656582","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":"Giant ferralsol genesis in Brazilian dry forest","authors":"José João Lelis Leal de Souza ,&nbsp;Mehmet Zeki Billor ,&nbsp;Ming-Kuo Lee ,&nbsp;Maria Daniely Freire Guerra ,&nbsp;Daniel Kroehling Rodrigues Cardoso ,&nbsp;Edvaldo Cardoso ,&nbsp;Rafael Albuquerque Xavier ,&nbsp;Bartolomeu Israel de Souza ,&nbsp;Fabiana Monteiro de Oliveira ,&nbsp;Christiane Farias da Fonseca","doi":"10.1016/j.catena.2025.109283","DOIUrl":"10.1016/j.catena.2025.109283","url":null,"abstract":"<div><div>Brazilian semiarid dominantly hosts thin and incipient soils. These soils have limited information about landscape evolution. This study investigates the formation and paleoenvironmental significance of a six-meter Ferralsol in the Araripe Plateau, Brazilian semiarid region. Through a multi-proxy approach, we analyzed soil morphology, micromorphology, geochemistry, carbon isotopes, and rare earth element (REE) fractionation. Deep weathering and leaching processes formed acidic, clay-rich Ferralsols under past climatic oscillations. Buried umbric horizons at 70 cm and 150 cm depth suggest organic matter accumulation in wetter climatic phases. Radiocarbon dating and δ¹³C analyses indicate significant climatic fluctuations over the last 8 cal kyr BP, with alternating wet and dry periods influencing vegetation composition and soil formation. Micromorphological and geochemical data indicate a polygenetic soil formed under contrasting conditions and remobilized materials. Negative Ce anomalies in umbric horizons suggest past reducing conditions, while positive Ce anomalies in high-crystalline Fe oxides indicate oxidative environments. A negative Eu anomaly across most horizons reflects deep leaching, whereas a positive Eu anomaly in organic fractions suggests localized metal–organic complexation. Sedimentation rates and isotopic shifts highlight climate-driven geomorphic processes, including colluvial deposition and slope instability. These findings support the hypothesis that Ferralsols in the Araripe Plateau are not strictly formed in situ but have been influenced by erosion, transport, and redeposition processes. Our findings underscore the interplay between climate, geomorphology, and soil genesis in the Neotropical dry forest. The Araripe Plateau’s Ferralsols serve as paleoenvironmental archives, capturing Holocene climate variability and its influence on vegetation and landscape evolution.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109283"},"PeriodicalIF":5.4,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633398","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":"Using multiple environmental tracers to unravel surface water and groundwater interactions in a mountainous river basin fragmented by large reservoirs","authors":"Fei Liu,&nbsp;Yanhui Guo,&nbsp;Pinna Zhen,&nbsp;Xiaoshuai Guo","doi":"10.1016/j.catena.2025.109295","DOIUrl":"10.1016/j.catena.2025.109295","url":null,"abstract":"<div><div>River fragmentation resulting from large reservoirs is rapidly increasing worldwide, but its impacts on surface water (SW)-groundwater (GW) interactions at upper and lower reaches of reservoirs are still poorly understood. Here, multiple water isotopes (δ¹⁸O, δD, and ²²²Rn) and hydrochemistry were jointly applied to identify the SW-GW interactions in the Upper Zhanghe River Basin impacted by three large reservoirs, a headwater basin of North China Plain. A total of 162 water samples were collected during three sampling campaigns for chemical and isotopic analysis. Results showed that SW and GW were predominated by Ca-HCO₃ type, with highly spatial variability and insignificant seasonal changes in chemical signatures. Most of groundwater samples presented higher d-excess and lower δ¹⁸O than those of adjacent river water samples, suggesting that river water was largely recharged by isotopically depleted groundwater. The upstream river of Guanhe and Houwan Reservoirs was recharged by riparian GW in both pre-monsoon and post-monsoon seasons, while their downstream river was a mixture of reservoir water (8 % to 88 %) and riparian GW (12 % to 92 %) with various mixing fractions. The Zhangze Reservoir’s upper reaches varied from a pre-monsoon gaining reach to a post-monsoon losing river segment (∼32 %). Its lower reach was a losing river segment in pre-monsoon, whereas the post-monsoon SW-GW exchange patterns evolved from a river stretch dominated by reservoir water through a gaining segment (GW: ∼11 %) to a losing reach (50 % ± 7 %). Furthermore, the shorter residence time (0.45 day) of groundwater downstream of Zhangze Reservoir than that (2.83 days) at the upper losing reach, also corroborated a stronger influence of river leakage and higher aquifer permeability at the lower reach. These findings will advance the knowledge of SW-GW interactions in ungauged mountainous river basins fragmented by reservoirs, with important implications for future integrated management of multiple water sources in similar river basins worldwide.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109295"},"PeriodicalIF":5.4,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614120","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":"Spatial distribution of soil organic matter in different particle size fractions in the wind erosion region of northeastern China","authors":"Xintong Wu ,&nbsp;Yang Yang ,&nbsp;Hong Cheng ,&nbsp;Ning Jiang ,&nbsp;Bo Wu ,&nbsp;Yongmei Huang","doi":"10.1016/j.catena.2025.109294","DOIUrl":"10.1016/j.catena.2025.109294","url":null,"abstract":"<div><div>Soil wind erosion is one of the major ecological and environmental issues in arid, semi-arid and partly semi-humid regions, and serves as an important driver of the migration and turnover of soil organic matter (SOM). The soil organic matter loss via wind erosion is typically calculated based on SOM of the bulk soil sample collected in the source areas, which usually remarkably deviates from the actual SOM budget. To address this discrepancy, it is imperative to examine SOM differentiation across particle size fractions and its spatial distribution in wind erosion regions. A total of 40 soil samples were collected in the wind erosion region of northeastern China and dry-sieved into eight size fractions, i.e., 0–63, 63–100, 100–150, 150–200, 200–250, 250–300, 300–400, and 400–880 μm, and SOM was measured for each fraction. The particle size-specific SOM predictive models were developed, and the spatial distribution of SOM in each fraction was simulated for the wind erosion region of northeastern China. No matter for which size fraction, the predictive model exhibited strong performance and stability based on the three key factors, i.e., SOM in bulk soil (SOM_bulk), soil clay content (CLAY) and temperature (T), which was capable of explaining over 75 % of the SOM variation. The simulated spatial mean SOM showed a general decreasing trend from the 0–63 μm to the 300–400 μm fractions, followed by a slight increase in the 400–880 μm fraction. Specifically, the area proportion of SOM larger than 30 g·kg⁻¹ decreased markedly from 45.44 % in the 0–63 μm fraction to 16.07 % in the 300–400 μm fraction, whereas the proportion of SOM below 10 g·kg⁻¹ increased from 8.50 % to 22.21 %. These changes were mainly distributed in western Hulunbuir City, western Xilin Gol League, and the Horqin sandy land, where soils are subject to wind erosion, characterized by low clay content and weak aggregation. In contrast, the area proportion of SOM exceeding 20 g·kg⁻¹ rose from 37.96 % in the 300–400 μm fraction to 43.57 % in the 400–880 μm fraction. This trend was primarily spotted in the semi-humid zones, where well-developed aggregates promoted SOM accumulation. The findings provide a crucial foundation for accurate quantification of wind erosion-driven SOM loss and in-depth understanding of land degradation mechanisms in northeastern China.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109294"},"PeriodicalIF":5.4,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614121","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":"Living in a hardwater lake – The Late Weichselian and Holocene history of the small kettle hole on the moraine plateau in Ostrowite (N Poland)","authors":"Piotr Kittel ,&nbsp;Olga Antczak-Orlewska ,&nbsp;Karina Apolinarska ,&nbsp;Daniel Okupny ,&nbsp;Mirosław Makohonienko ,&nbsp;Marta Rudna ,&nbsp;Joanna Rennwanz ,&nbsp;Robert Sobczyk ,&nbsp;Aleksandra Leszczyk ,&nbsp;Mateusz Płóciennik ,&nbsp;Dmitry Tsvirko ,&nbsp;Bartosz Kotrys ,&nbsp;Tomasz Goslar ,&nbsp;Jerzy Sikora","doi":"10.1016/j.catena.2025.109293","DOIUrl":"10.1016/j.catena.2025.109293","url":null,"abstract":"<div><div>Local lithology has a strong influence on lake biocenoses, including macrophytes and invertebrate communities. Calcium carbonate (CaCO₃) content may drive ecosystem components from plankton (Cladocera), through various trophic groups of macrobenthos (Chironomidae) to molluscs settled on plants and bottom of the littoral zone. This study reconstructs the impact of carbonates on the biota in a small palaeolake during the Late Weichselian and Holocene in the recently glaciated area in Northern Poland. The main litho-geochemical component of the studied lacustrine deposits is calcium carbonate (CaCO₃), ranging from 0 to 98.7 % of the sediment content. The variability of the CaCO₃ content reflects changes in hydrological and geomorphological conditions within the palaeolake catchment area. The multi-proxy analyses enabled the reconstruction of a complex environmental history of the studied kettle hole lake. Oligo-/mesotrophic conditions with charophyte meadows during the Late Weichselian supported diverse chironomid communities. Cladocera became more abundant in the Early Holocene, reflecting hydroclimatic changes. The transition into macrophytic meso-/eutrophic conditions in the lake was reflected in the SiO_2bio and TOC increase. This phase ended with a period of the highest CaCO₃ concentration in the lake’s history, which supported mollusc assemblages. The final terrestrialisation followed the maximum decalcification in the catchment. Some Chironomidae appeared to be tolerant to relatively high carbonate concentrations, but this group feeds mainly on the bottom FPOM and most of the taxa declined when CaCO₃ exceeded 70 %. The mollusc abundance and richness were correlated with the carbonate content in the lake. Hardwater lakes defy simple interpretation in palaeolimnology. The classification of invertebrates according to their tolerance for carbonate content presented here helps in reconstructing palaeocenoses reaction to litho-chemical changes in lake basins.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109293"},"PeriodicalIF":5.4,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632306","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":"Aridity threshold in affecting soil phosphorus availability in natural terrestrial ecosystems","authors":"Zhuojun Zhang ,&nbsp;Hai-Ruo Mao","doi":"10.1016/j.catena.2025.109290","DOIUrl":"10.1016/j.catena.2025.109290","url":null,"abstract":"<div><div>Phosphorus (P) availability in soils controls critical functions and properties of terrestrial ecosystems. As global warming intensifies aridity and extreme precipitation, soil moisture regimes are undergoing significant shifts. However, the effects of increasing aridity on soil P availability remain poorly understood. Using a global database of Hedley P fractions from 802 (semi-natural) natural soils compiled from 96 published studies, this study revealed nonlinear patterns of five functional P fractions (available P, adsorbed P to secondary minerals, organic P, Ca-bound P, and occluded P) across the aridity index (AI) gradient in global terrestrial ecosystems, with two critical thresholds at approximately AI = 1.14 and 2.26. From AI 0 to 1.14, P availability increases, likely due to the dissolution of Ca-bound P driven by decreasing soil pH as AI increases. Between AI 1.14 and 2.26, P availability declines, possibly because occluded P becomes dominant, with clay content and occlusion processes playing a larger role in limiting available P. From AI 2.26 to 4, P availability increases again, likely due to a significant reduction in occluded P, which may be linked to anaerobic conditions and high organic C concentrations that enhance P availability. These findings highlight distinct mechanisms and controlling factors governing P biogeochemical cycling across different AI regimes and provide critical insights for improving predictions of nutrient cycling in terrestrial ecosystems under future climate change scenarios.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109290"},"PeriodicalIF":5.4,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605356","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":"Climate change and nutrient influx disrupt karst ecosystem dynamics and tufa deposition in Huanglong, China","authors":"Muhammad Ibrar ,&nbsp;Bing Li ,&nbsp;Hanyong Zeng ,&nbsp;Anđelka Plenković-Moraj ,&nbsp;Kazimir Miculinić ,&nbsp;Dejun An ,&nbsp;Yanbao Lei ,&nbsp;Geng Sun","doi":"10.1016/j.catena.2025.109291","DOIUrl":"10.1016/j.catena.2025.109291","url":null,"abstract":"<div><div>Climate change and anthropogenic activities have severe and irreversible impacts on aquatic ecosystems globally. Huanglong, a UNESCO World Heritage site with tufa deposits, is significantly impacted by climate change and the influx of exogenous nutrients from tourism and vegetation. In this study, we investigate the influence of climate change (temperature increase) and nutrient input (P and N sources, breadcrumbs, and litter) on aquatic geochemical factors dynamics and associated biota (algae and bacteria) that impact tufa deposition. Our results show that tufa deposition is primarily influenced by abiotic factors, particularly temperature and pH, while biological processes, especially eutrophication by organic matter and phosphate input, negatively affect tufa formation. The nutrient input leads to a regime shift in the biotic communities and significantly impacts tufa deposition. Notably, P was identified as a limiting factor in Huanglong Ravine, showing a strong correlation with Proteobacteria and Chlorophyta. In contrast, nitrogen input has minimal effects on taxonomic composition and tufa deposition. Proteobacteria, Actinobacteria, and Bacteroidetes are conserved bacterial phyla associated with algae proliferation independent of nutrient availability or other environmental factors. Our findings support the efficacy of P reduction strategies in mitigating eutrophication and emphasize restricting nutrient and P inputs to maintain freshwater biodiversity and protect tufa landscapes. These insights are crucial for developing strategies and measures to mitigate the combined effects of climate change and anthropogenic activities on tufaceous karst ecosystems.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109291"},"PeriodicalIF":5.4,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614329","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}