IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-02-11 DOI: 10.1016/j.catena.2026.109905

Geraldo José Diogo Filho, José Pereira de Queiroz Neto

This study investigated soil processes along a catena under primary Atlantic Forest in southeastern Brazil. The role of biota in soil formation remains largely unaddressed at this region, a UNESCO World Heritage Site. This study innovatively investigates biological influences on pedogenesis along a representative catena. Three profiles were sampled at the crest, middle slope, and lower slope, where soils and litter were morphologically described, physically and chemically analyzed, and classified. Melanization in organomineral horizons was quantified using the Profile Darkening Index. The effects of root and earthworm bioturbation were characterized to evaluate biotic–abiotic interactions in soil formation. Bulk density varied from 0.53 g cm⁻³ (crest A horizon) to 1.72 g cm⁻³ (lower slope E horizon), while total carbon ranged from 123.5 g kg⁻¹ (crest Oa) to 2.9 g kg⁻¹ (lower slope E). Earthworm casts contained up to 77.1 g kg⁻¹C and enhanced nutrient contents (Ca²⁺: 0.7 cmol kg⁻¹; Mg²⁺: 0.5 cmol kg⁻¹). The combination of landform, water surplus, carbon input, and gneissic crystalline substrate creates a geochemical setting with strong leaching and acidity, where shallow soils develop. Organisms such as plants and earthworms play key roles in catena dynamics by enhancing infiltration, reducing erosion, and preserving organic matter, thereby directly influencing soil processes along the catena. Our findings demonstrate that organisms significantly affect pedogenetic processes across the hillslope. Integrating biotic–abiotic interactions is essential for interpreting tropical soil evolution and for guiding conservation strategies in Atlantic Forest environments under high denudation pressure.

本研究调查了巴西东南部大西洋原始森林下的土壤过程。作为联合国教科文组织世界遗产地，这一地区的生物群在土壤形成中的作用在很大程度上仍未得到解决。本研究创新性地研究了沿代表性链的生物对土壤形成的影响。在坡顶、中坡和下坡三个剖面取样，对土壤和凋落物进行了形态描述、物理和化学分析，并进行了分类。利用剖面暗化指数对有机层的黑化进行了量化。研究了根系和蚯蚓扰动对土壤形成过程中生物-非生物相互作用的影响。堆积密度从0.53 g cm−3（波峰A层）到1.72 g cm−3（下坡E层），而总碳量从123.5 g kg−1（波峰Oa）到2.9 g kg−1（下坡E层）不等。蚯蚓粪含有高达77.1 g kg - 1C和增强的营养含量（Ca2+: 0.7 cmol kg - 1; Mg2+: 0.5 cmol kg - 1）。地形、水分过剩、碳输入和片麻质晶体基质的结合，创造了一个具有强淋滤和酸性的地球化学环境，在这里，浅层土壤发育。植物和蚯蚓等生物通过增强入渗、减少侵蚀和保存有机质，从而直接影响着链带沿线的土壤过程，在链带动力学中起着关键作用。我们的研究结果表明，生物显著影响整个山坡的成土过程。整合生物-非生物相互作用对于解释热带土壤演变和指导高剥蚀压力下大西洋森林环境的保护策略至关重要。

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引用次数: 0

Wheel traffic may increase surface stratification of soil organic carbon in older apple plantations 车轮交通可能增加老苹果人工林土壤有机碳的表层分层

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-02-10 DOI: 10.1016/j.catena.2026.109887

Siyu Wang , Wei Hu , Heather Jenkins , Dougal Stalker , Craig Tregurtha , Rogerio Cichota , Henry Wai Chau , Jim Moir , Karin Müller , Brendon Malcolm

Soil organic carbon (SOC) is key to maintaining soil health and supporting ecosystem services. However, the impacts of wheel traffic-induced compaction on SOC stocks in perennial horticultural systems, particularly across contrasting soil types, plantation ages, and deep soil profiles, remain unclear. This study was conducted in two commercial apple orchards in New Zealand with contrasting plantation ages: Canterbury (3, 12, and 40 years) and Tasman (12, 17, and 28 years). At each site, soil cores were collected from 0 to 90 cm across tree rows, wheel tracks, and inter-track areas. Stocks of SOC and hot water extractable carbon (HWEC) were calculated using an equivalent soil mass approach to account for compaction-related differences in soil mass. We then quantified position-related differences in SOC and HWEC and tested whether these effects were modified by plantation age (sampling position × plantation age interactions). In the 0–30 cm depth, across all plantation ages, wheel-track areas had the highest SOC and HWEC stocks, with SOC stocks increasing by 3–20% higher than in other positions and HWEC stocks 7–41% higher. The compaction effect was more pronounced in older plantations (e.g., ≥17 years). However, when considering the deeper (0–90 cm) soil profile, compaction effects were generally insignificant. This study highlights that wheel traffic-induced compaction is associated with surface enrichment of SOC and HWEC, particularly in older plantations (e.g., ≥17 years). Additionally, SOC and HWEC stocks may initially increase with plantation age and then decrease, reaching a peak at a certain plantation age (12 and 28 years for SOC in Canterbury and Tasman, respectively, and 12 years for HWEC at both sites). For future research, the accuracy of SOC stock estimations could be improved by explicitly accounting for spatial variability across soil depths and sampling positions, and by considering how this variability changes with management practices and plantation age.

土壤有机碳（SOC）是维持土壤健康和支持生态系统服务的关键。然而，车轮交通压实对多年生园艺系统有机碳储量的影响，特别是不同土壤类型、人工林年龄和深层土壤的影响尚不清楚。本研究在新西兰的两个商业苹果园进行，不同的种植年龄：坎特伯雷（3、12和40年）和塔斯曼（12、17和28年）。在每个站点，在树木行、车轮轨迹和轨道间区域的0至90厘米处收集土壤岩心。利用等效土壤质量法计算土壤有机碳储量和热水可提取碳储量，以解释土壤质量与压实相关的差异。然后，我们量化了SOC和HWEC的位置相关差异，并检验了这些影响是否受到人工林年龄的影响（采样位置×人工林年龄的相互作用）。在0 ~ 30 cm深度，轮轨林地的SOC和HWEC储量最高，SOC储量比其他林地高3 ~ 20%，HWEC储量比其他林地高7 ~ 41%。压实效应在年龄较大（≥17年）的人工林中更为明显。然而，当考虑较深（0-90 cm）土壤剖面时，压实效应通常不显著。该研究强调，车轮交通引起的压实与土壤有机碳和HWEC的表面富集有关，特别是在较老的人工林（如≥17年）中。此外，SOC和HWEC储量均随林龄先增加后减少，并在某一林龄达到峰值（坎特伯雷和塔斯曼的SOC分别为12年和28年，两地的HWEC均为12年）。在未来的研究中，可以通过明确地考虑土壤深度和采样位置的空间变异性，并考虑这种变异性随管理实践和人工林年龄的变化，来提高土壤有机碳储量估算的准确性。

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引用次数: 0

Environmental gradients mediate divergent patterns of microbial nutrient use efficiency and metabolic limitation in arid desert ecosystems 环境梯度调节干旱荒漠生态系统微生物养分利用效率和代谢限制的差异模式

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-02-10 DOI: 10.1016/j.catena.2026.109913

Xiaotong Li , Yudong Chen , Jinlong Wang , Yulin Shu , Guang Yang , Guanghui Lv

Abstract

Transition zones between riparian and desert ecosystems are critical sentinels of environmental change, yet how microbial metabolic plasticity and resource use trade-offs respond to these steep environmental gradients remains poorly understood. This study investigated the transition zone along the Aqikesu River in the Ebinur Lake Wetland National Nature Reserve (ELWNNR), Xinjiang. By analyzing soil extracellular enzyme activities and stoichiometric characteristics across three habitats—mesic riparian (MR), arid desert (AD), and desert erosion (DE) areas, we explored the adaptive strategies of microbial metabolic limitation patterns and potential nutrient use efficiency, along with their driving mechanisms. Results revealed significant divergence in microbial nutrient limitations along the environmental gradient: the MR exhibited higher activities of carbon-acquisition enzymes and nitrogen-acquisition enzymes, while vector analysis indicated a relatively stronger carbon limitation in this area. The DE showed elevated phosphorus-acquisition enzyme activity with alleviated nitrogen limitation. Enzyme stoichiometric vector analysis demonstrated that nitrogen limitation dominated across the entire region, but carbon limitation was more pronounced in the MR area, while nitrogen limitation was mitigated in the DE area. Microbial carbon use efficiency (CUE) increased with increasing distance from the riverbank, whereas nitrogen use efficiency (NUE) declined. The random forest (RF) analysis identified litter nutrients, soil physicochemical properties, and the relative abundance of Acidobacteriota as the primary predictors of metabolic shifts. Partial least squares path modeling (PLS-PM) further elucidated the hierarchical regulatory pathways, revealing that abiotic constraints indirectly modulated CUE and NUE by driving shifts in microbial biomass and community diversity. These findings indicate that microbial nutrient use strategies are coregulated by environmental stressors and biological attributes, reflecting a distinct metabolic trade-off along the riparian-to-desert gradient. This study demonstrates the transition from growth-dominance to survival-dominance strategies in desert microbes and provides a theoretical basis for understanding the vulnerability and resilience of desert ecosystems under global desertification.

摘要河岸生态系统和沙漠生态系统之间的过渡区是环境变化的关键哨兵，但微生物代谢可塑性和资源利用权衡如何响应这些陡峭的环境梯度仍然知之甚少。本文对新疆艾比努湖湿地国家级自然保护区阿其克苏河沿岸过渡带进行了研究。通过分析近滨河岸（MR）、干旱荒漠（AD）和荒漠侵蚀（DE） 3种生境土壤胞外酶活性和化学计量学特征，探讨了微生物代谢限制模式和潜在养分利用效率的适应策略及其驱动机制。结果显示，微生物营养限制在环境梯度上存在显著差异：MR表现出较高的碳获取酶和氮获取酶活性，而载体分析显示该地区的碳限制相对较强。DE表现出磷获取酶活性升高，氮限制减轻。酶化学计量向量分析表明，氮限制在整个区域占主导地位，但碳限制在MR区更为明显，而氮限制在DE区有所缓解。微生物碳利用效率（CUE）随距离河岸的增加而增加，氮利用效率（NUE）随距离河岸的增加而降低。随机森林（RF）分析发现，凋落物养分、土壤理化性质和酸杆菌群的相对丰度是代谢变化的主要预测因子。偏最小二乘路径模型（PLS-PM）进一步阐明了分层调控途径，揭示了非生物约束通过驱动微生物生物量和群落多样性的变化间接调节CUE和NUE。这些发现表明，微生物养分利用策略受环境应激源和生物属性的共同调节，反映了沿河岸到沙漠梯度的独特代谢权衡。该研究揭示了荒漠微生物从生长优势向生存优势的转变，为理解全球沙漠化背景下荒漠生态系统的脆弱性和恢复力提供了理论依据。

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引用次数: 0

Precipitation on the spatiotemporal variations of soil volumetric water content at different depths in forested catchments 降水对森林流域不同深度土壤体积含水量时空变化的影响

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-01-23 DOI: 10.1016/j.catena.2026.109849

Hongfen Zhu , Dean F. Meason , Serajis Salekin , Priscilla Corbett-Lad , Jianming Xue

The interactions between precipitation and topography that control soil volumetric water content (VWC) dynamics remain poorly understood across soil depths and under varied environmental conditions in forested catchments. This study investigated the dynamics of VWC at multiple depths (0–100 cm) in two New Zealand forest catchments that differ in precipitation, soil, and geology. Using continuous VWC data and wavelet coherency method, we quantified the multiscale relationships among VWC, precipitation, and topographic factors. Results revealed that VWC increased with depth, while spatial variability decreased, reflecting an inverse relationship between VWC level and spatial heterogeneity. Precipitation accounted for over 65% of temporal VWC variation, with short-term effects dominating in the humid catchment and longer-term impacts in the moderately humid catchment. Precipitation generally reduced spatial VWC variability, although modulated by wet–dry cycles, tree phenological activity (active and dormant periods), and catchment-specific characteristics. Topographic factors—particularly the topographic wetness index (TWI), planform curvature (PFC), and topographic position index (TPI)—significantly shaped the spatial distribution of VWC at depths of 30–100 cm, however, the dominant topographic drivers in the topsoil varied between catchments. These findings underscore the complex interactions among precipitation, topography, and soil depth in shaping the spatiotemporal patterns of VWC. By clarifying these relationships across scales and environmental contexts, this study contributes to the development of improved frameworks for soil moisture monitoring and hydrological modeling in forested landscapes.

在森林流域，在不同的土壤深度和不同的环境条件下，降水和地形之间控制土壤体积含水量（VWC）动态的相互作用仍然知之甚少。本研究调查了新西兰两个不同降水、土壤和地质条件的森林集水区不同深度（0-100 cm）的VWC动态。利用连续VWC数据和小波相干方法，量化了VWC与降水和地形因子之间的多尺度关系。结果表明，植被覆盖面积随深度增加而增加，而空间变异性则减小，反映了植被覆盖面积与空间异质性呈反比关系。降水占VWC变化的65%以上，短期影响在湿润流域占主导地位，长期影响在中度湿润流域占主导地位。尽管降水受干湿循环、树木物候活动（活跃期和休眠期）和流域特征的调节，但总体上降低了VWC的空间变异性。地形因子，特别是地形湿度指数（TWI）、平台曲率（PFC）和地形位置指数（TPI）显著地影响了30-100 cm深度VWC的空间分布，但表土的主要地形驱动因素在不同流域之间存在差异。这些发现强调了降水、地形和土壤深度之间的复杂相互作用在形成VWC时空格局中的作用。通过澄清这些跨尺度和环境背景的关系，本研究有助于改进森林景观中土壤湿度监测和水文建模的框架。

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引用次数: 0

Dynamic vegetation responses to climate change and human activities in the eastern North China region over the past 3,500 years: Pollen record from the Caofeidian Wetland 近3500年来华北东部植被对气候变化和人类活动的动态响应——曹妃甸湿地的花粉记录

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-02-09 DOI: 10.1016/j.catena.2026.109881

Shiyao Chai , Ying Wang , Rongrong Wang , Hongyu Song , Ran Zhang , Xiangyue Kong , Yunfei Yang , Yawen Ge , Bing Li , Yuecong Li

Climate change and human activities during the late Holocene have jointly affected significant changes in ecosystems and regional landscapes; however, the relative importance of their roles may vary significantly over time. The REVEALS model provides a robust framework for quantitatively reconstructing the relative abundances of dominant regional vegetation. Using the Caofeidian Wetland pollen record, we combined REVEALS and Rate of Change (RoC) analysis to infer vegetation dynamics and applied the WA-PLS model to reconstruct past precipitation quantitatively. Our results indicate that the Caofeidian vegetation type has remained broadly stable over the past 3500 years, with Quercus-dominated deciduous broadleaved forest and herbaceous communities dominated by Poaceae and Chenopodium. Forest cover reached its maximum during 3500–3200 cal yr BP, after which there were two abrupt vegetation change events: at ∼2.5 ka BP and ∼220 cal yr BP. The ∼2.5 ka BP event is characterized by the lowest arboreal relative abundance (12.8%) and a shift from a forest to grassland. This vegetation change was likely driven by prolonged drought and a precipitation reduction of >30%. Concurrently, the significant increase in the relative abundance of Chenopodium was likely induced by a decline in relative sea level. In contrast, the ∼220 cal yr BP event is marked by increased arboreal relative abundance and fern spores percentage, coupled with decreases in the relative abundances of Poaceae and Chenopodium and vegetation pollen concentration, and was mainly associated with intensified human activities. This study provides new evidence documenting the responses of East Asian coastal wetland ecosystems to climate change and human activities, and it serves as a reference for predicting changes in vegetation ecosystems under future climate scenarios.

全新世晚期气候变化和人类活动共同影响了生态系统和区域景观的显著变化；然而，随着时间的推移，他们的角色的相对重要性可能会有很大的不同。揭示模型为定量重建优势区域植被的相对丰度提供了一个强大的框架。利用曹妃甸湿地花粉记录，结合reveal和RoC分析推断植被动态，并应用WA-PLS模型定量重建过去降水。结果表明，在过去的3500年里，曹菲甸的植被类型基本保持稳定，以栎科为主的落叶阔叶林和禾本科为主的草本群落。森林覆盖在3500 ~ 3200 cal yr BP期间达到最大值，之后在~ 2.5 ka BP和~ 220 cal yr BP发生了两次植被突变事件。~ 2.5 ka BP事件的特征是树木相对丰度最低（12.8%），从森林向草地转变。这种植被变化可能是由长期干旱和降水减少30%造成的。同时，Chenopodium相对丰度的显著增加可能是由相对海平面下降引起的。与此相反，在~ 220 cal yr BP事件中，树木的相对丰度和蕨类孢子率增加，禾科和藜科植物的相对丰度和植被花粉浓度下降，主要与人类活动加剧有关。本研究为东亚沿海湿地生态系统对气候变化和人类活动的响应提供了新的证据，并为预测未来气候情景下植被生态系统的变化提供了参考。

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引用次数: 0

Reconstructions of global last glacial maximum glaciers and climate in the Karakoram Mountains, northwestern Tibetan plateau 青藏高原西北部喀喇昆仑山脉末次冰期最大冰川与气候的重建

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-02-05 DOI: 10.1016/j.catena.2026.109900

Yaqing Sun , Xiangke Xu , Hongjie Zhang , Jiule Li

Understanding the historical response of Karakoram glaciers to climate forcing is essential for interpreting the “Karakoram anomaly.” However, quantitative studies examining the extent of palaeoglaciers in this region remain limited, particularly for the global Last Glacial Maximum (gLGM; 24–18 ka BP, Mix et al., 2001). Based on glacial geomorphological evidence and chronological constraints, we mapped 853 glaciers in the Karakoram Mountains representing their extent during the gLGM. We then used ArcGIS tools to reconstruct glacier thicknesses and surfaces, as well as to calculate equilibrium-line altitudes (ELAs). We also analyzed glacier changes in the study area since the gLGM. Based on the mean ELA change (∆ELA), we inferred the gLGM climate in the Karakoram region using a glacier–climate model. This study shows that during the gLGM, glaciers in the Karakoram Mountains covered an area of approximately 71,725 km² and a volume of about 23,899 km³, with a mean thickness of ∼127.7 m, a mean surface elevation of ∼4995.4 m, and a mean ELA of ∼4991.9 m. Since the gLGM, glaciers have lost 66.6% of their area and 90.2% of their volume, while the mean ELA has risen by 373.3 m. The gLGM mean annual temperature is estimated to have been ∼4.5–8.8 °C lower than present, with precipitation constrained to approximately 30%–70% of modern levels. Furthermore, our synthesis of gLGM regional climate reconstructions for the Tibetan Plateau (TP) and adjacent mountain regions, based on glacier proxy indicators, reveals a gradual decrease in the magnitude of temperature changes from the plateau margins toward the interior. However, the temperature trend inferred from climate proxy indicators contradicts the simulation results based on the Paleoclimate Modelling Intercomparison Project (PMIP), which underestimate the magnitude of temperature changes along the margins of the TP.

了解喀喇昆仑冰川对气候强迫的历史响应对于解释“喀喇昆仑异常”至关重要。然而，对该地区古冰川范围的定量研究仍然有限，特别是对全球末次盛冰期的研究（gLGM; 24-18 ka BP, Mix et al., 2001）。基于冰川地貌证据和年代学限制，我们绘制了喀喇昆仑山脉853个冰川，代表了gLGM期间的冰川范围。然后，我们使用ArcGIS工具重建冰川厚度和表面，并计算平衡线高度（ELAs）。我们还分析了gLGM以来研究区域的冰川变化。基于平均ELA变化（∆ELA），采用冰川-气候模式对喀喇昆仑地区gLGM气候进行了推断。研究表明，gLGM期间，喀喇昆仑山脉冰川面积约71725 km2，体积约23899 km3，平均厚度约127.7 m，平均地表高程约4995.4 m，平均ELA约4991.9 m。自gLGM以来，冰川面积减少了66.6%，体积减少了90.2%，而平均ELA上升了373.3 m。据估计，gLGM年平均温度比现在低~ 4.5-8.8°C，降水被限制在现代水平的约30%-70%。此外，基于冰川代用指标对青藏高原及其邻近山区的gLGM区域气候重建结果表明，青藏高原边缘向内部的温度变化幅度逐渐减小。然而，由气候代理指标推断出的温度趋势与基于古气候模拟比对项目（PMIP）的模拟结果相矛盾，前者低估了沿青藏高原边缘的温度变化幅度。

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引用次数: 0

Distribution of soil functional genes and enzymes jointly determined by slope positions and latitude in Mollisols belt 坡位和纬度共同决定Mollisols带土壤功能基因和酶的分布

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-01-25 DOI: 10.1016/j.catena.2026.109838

Haijun Zhang , Shaoliang Zhang , Weitao Xu , Sihua Yan , Xiaoguang Niu , Pengke Yan , Muhammad Aurangzeib , Ziliang Xiao , Mingming Guo , Jielin Liu , Jinzhong Xu

The spatial heterogeneity of microbial functional genes (FGs) and the enzymes is highly correlated with nutrient cycling in soils. However, it is debated how latitude and topography influence the spatial distribution of microbial function at large scale, especially lacks reports about their interactions. To elucidate their interactive and individual effects, this study collected soil samples from the top, middle and bottom slope positions in seven locations with intervals of 80 km along the Mollisols belt in Northeast China (42°47′N-48°9′N). Shotgun sequencing and micro assay were used to characterize soil FGs and enzyme, respectively. Results indicated that (1) when slope positions were neglected, the abundance of most carbon (C) degradation FGs (starch, lignin) decreased linearly with latitude, while enzyme increased linearly. When the slope positions were considered, the variation of them with latitude was greater in middle slope than other slope positions. Phosphorus (P) FGs and enzyme activity increase linearly with latitude, and greater variation in bottom slope. Nitrogen (N) fixation FGs abundance increases firstly and then decreases with latitude in bottom slope, while increases linearly in other slope positions; (2) when latitude and slope positions were considered together, their interaction significantly influenced the distribution of C, N, and P genes and enzyme; (3) the β diversity of FGs exhibited a unimodal pattern with latitude due to specific climate and soil heterogeneity, which differed from previous knowledge; (4) breaking previous insights, the correlation coefficient between FGs and corresponding enzyme showed quadratic function with latitude caused by microbial functional redundancy and environmental constraints, with significant positive only at 43.8°-47.7°. Our study highlights the interaction of slope position and latitude determined soil microbial function, and recommends sampling based on slope positions as the minimum unit. This may also enhance the accuracy of microbial function studies and C and N cycle models in Mollisols.

土壤微生物功能基因和酶的空间异质性与土壤养分循环密切相关。然而，人们对纬度和地形如何在大尺度上影响微生物功能的空间分布存在争议，特别是缺乏关于它们之间相互作用的报道。为了阐明它们之间的相互作用和个体效应，本研究在东北Mollisols带（42°47′n -48°9′n）上、中、底坡7个地点采集了土壤样品，采样间隔为80 km。采用散弹枪测序法和微量法分别对土壤FGs和酶进行表征。结果表明：(1)忽略坡位时，大多数碳(C)降解FGs（淀粉、木质素）丰度随纬度线性降低，而酶丰度随纬度线性增加。在考虑坡位的情况下，中坡的坡度随纬度的变化大于其他坡位。磷(P) gs和酶活性随纬度呈线性增加，且底部坡度变化较大。固氮FGs丰度在坡底随纬度先增大后减小，其他坡位呈线性增加；(2)当纬度和坡位同时考虑时，它们的相互作用显著影响C、N、P基因和酶的分布；(3)受特定气候和土壤异质性的影响，FGs β多样性随纬度呈单峰型分布，与以往认识不同；(4)在微生物功能冗余和环境约束下，FGs与相应酶的相关系数与纬度呈二次函数关系，仅在43.8°~ 47.7°呈显著正相关。我们的研究强调斜坡位置和纬度的相互作用决定了土壤微生物的功能，并建议以斜坡位置为最小采样单位。这也可能提高mollisol微生物功能研究和C、N循环模型的准确性。

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引用次数: 0

Fluvial-aeolian interactions in northeastern South America: Implications for provenance and paleoenvironmental interpretations 南美洲东北部河流-风沙相互作用：对物源和古环境解释的影响

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-01-31 DOI: 10.1016/j.catena.2026.109857

Daniel Rodrigues de Lira , Antonio Carlos de Barros Corrêa , Drielly Naamma Fonsêca , José Danilo da Conceição Santos , Bruno de Azevedo Cavalcanti Tavares , Keyla Manuela Alencar da Silva Alves

This study examines surface coverings in the sub-middle sector of the São Francisco River, situated in the semi-arid core of northeastern Brazil, to reconstruct environmental changes from the Last Glacial Maximum through the Holocene. A morphostratigraphic approach integrated sedimentological, geochemical, and Optically Stimulated Luminescence (OSL) analyses of colluvial, fluvial, fluvio-aeolian, and aeolian deposits. Geochemical results indicate predominantly felsic sediment sources and high degrees of chemical weathering, reflecting palaeoclimatic conditions wetter than at present, punctuated by periods of renewed severe semi-aridity. OSL ages spanning ∼20 ka to the Late Holocene reveal sedimentation pulses synchronous with major global climate events—including Heinrich stadials, the Bølling–Allerød, the Younger Dryas, and the Holocene Climatic Optimum—followed by progressive drying from the onset of the Late Holocene, with a return to aeolian deposition. Alternation between erosional and aggradational phases suggests strong regulation of the São Francisco's hydro-sedimentary regime by large-scale climatic teleconnections, with implications for understanding the resilience and vulnerability of semi-arid environments under future climate-change scenarios. The findings underscore the importance of Quaternary deposits as palaeoenvironmental archives and contribute to addressing key knowledge gaps on the geomorphological and palaeoclimatic dynamics of northeastern Brazil.

本研究考察了位于巴西东北部半干旱核心地带的奥弗朗西斯科河中下游的地表覆盖物，重建了从末次盛冰期到全新世的环境变化。一种形态地层学方法综合了沉积学、地球化学和光激发光（OSL）对崩积、河流、河流-风成和风成沉积物的分析。地球化学结果表明，长英质沉积物来源主要，化学风化程度高，反映了古气候条件比现在更湿润，偶尔出现严重半干旱期。OSL年龄跨越~ 20ka至晚全新世，揭示了与主要全球气候事件同步的沉积脉冲，包括海因里希冰期、b ølling - allero ød冰期、新仙女木期和全新世气候最佳期，随后从晚全新世开始逐渐干燥，并恢复到风成沉积。侵蚀阶段和沉积阶段之间的交替表明，大尺度气候遥相关对旧金山河的水文沉积制度有很强的调节作用，这对理解未来气候变化情景下半干旱环境的恢复力和脆弱性具有重要意义。这些发现强调了第四纪沉积物作为古环境档案的重要性，并有助于解决巴西东北部地貌和古气候动力学方面的关键知识空白。

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引用次数: 0

Characterization of nutrient release from volcanic rocks in soils from the southern Main Ethiopian Rift 埃塞俄比亚主裂谷南部土壤中火山岩中养分释放的特征

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-01-27 DOI: 10.1016/j.catena.2026.109830

David Buriánek , Emi Hažmuková , Jana Janderková , Petra Pacherová , Ilja Knésl , Kryštof Verner

The Ethiopian Rift, with its rugged topography and varied lithology, substantially influences soil physicochemical properties. Nutrient distribution within these landscapes is primarily influenced by rock geochemistry and weathering intensity, though their interactions remain debatable. Consequently, we investigated soil chemical and mineral composition across various volcanic substrates at different altitudes in the Ethiopian Highlands. At elevations up to 1800 m above sea level, kaolinite mineral dominates saprolite, reflecting advanced weathering. A-horizons in this region exhibit low pH levels (KCl/CaCl₂: 3.7 to 6.3) and medium to high cation exchange capacity (CEC: 11 to 51 cmolc.kg⁻¹). A positive correlation between Organic Carbon (Cox: 1.7 to 4.6 wt%) and CEC highlights the role of organic matter in nutrient retention in the A-horizon. By contrast, rift floor soils—modified by Holocene to Pleistocene pyroclastic deposits—show mixed mineralogy of kaolinite, smectites, chlorites, volcanic glass (pumice), feldspars, quartz, and iron hydroxides. Their A-horizons have pH values of 4.0–7.1 (KCl/CaCl₂), with medium to low levels of Cox (0.3–2.8 wt%), and CEC ranging from 14 to 58 cmolc.kg⁻¹. The CEC is positively correlated with clay mineral content, particularly smectite. Here, nutrient availability is closely related to clay mineral content, especially smectite, and the progressive weathering of volcanic glass. These findings indicate contrasting controls on soil fertility: in Highlands, organic matter strongly regulates nutrient availability, whereas in rift floor soils, mineralogy and volcanic glass weathering are the dominant drivers. Together, they highlight the dual importance of organic processes and parent material alteration in shaping soil development across the Main Ethiopian Rift.

埃塞俄比亚大裂谷地形崎岖，岩性多变，对土壤理化性质有很大影响。这些景观中的营养分布主要受岩石地球化学和风化强度的影响，尽管它们之间的相互作用仍有争议。因此，我们研究了埃塞俄比亚高原不同海拔的各种火山基质的土壤化学和矿物组成。在海拔1800米以上的地方，高岭石矿物以腐岩为主，反映出超前的风化作用。该地区的a层具有较低的pH值（KCl/CaCl2: 3.7 ~ 6.3）和中高的阳离子交换容量（CEC: 11 ~ 51 cmol .kg−1）。有机碳（Cox: 1.7 ~ 4.6 wt%）与CEC呈正相关关系，突出了有机质在A层营养物质保留中的作用。相比之下，裂谷底土壤——由全新世至更新世火山碎屑沉积物改造——显示出高岭石、蒙脱石、绿泥石、火山玻璃（浮石）、长石、石英和铁氢氧化物的混合矿物学特征。其a层的pH值为4.0-7.1 (KCl/CaCl2)， Cox含量中低（0.3-2.8 wt%）， CEC范围为14 - 58 cmolc.kg−1。CEC与粘土矿物含量，尤其是蒙脱石含量呈正相关。在这里，营养物质的有效性与粘土矿物含量密切相关，特别是蒙脱石，以及火山玻璃的渐进风化。这些发现表明了土壤肥力的不同控制因素：在高地，有机质强烈地调节养分有效性，而在裂谷底土壤，矿物学和火山玻璃风化是主要的驱动因素。总之，他们强调了有机过程和母质变化在塑造埃塞俄比亚主裂谷土壤发育中的双重重要性。

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Mapping land degradation in the Massili River Basin, Burkina Faso: a spatio-temporal analysis of contributing factors 布基纳法索马西利河流域土地退化制图：影响因素的时空分析

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena

Pub Date : 2026-04-01 Epub Date: 2026-01-30 DOI: 10.1016/j.catena.2026.109873

Victorine Koala , Samuel Olalekan Olajuyigbe , Blaise Ouedraogo , Kelvin C. Kamei , Kouamé Donald Kouman

Land degradation reduces soil fertility and alters ecosystem structure, leading to reduced productivity. This study analysed the spatial and temporal trends of factors driving land degradation in the Massili River Basin, Burkina Faso from 1992 to 2022. An integrated approach was applied by combining climatic (precipitation, temperature, aridity index), ecological (Normalised Difference Vegetation Index (NDVI), Rain Use Efficiency (RUE)), and anthropogenic (Human Influence Index) indicators, using Landsat imagery, meteorological records, demographic and vector data. Results showed a significant increase in rainfall and slight cooling, which together have shifted the basin from predominantly semi-arid to semi-humid conditions. Despite the changes in climatic trends, vegetation recovery was uneven, with NDVI revealing persistent declines in the southern basin alongside localized greening in central and northern areas, while RUE decreased in several zones, due to the influence of non-climatic pressures. Land use and land cover analyses revealed marked expansions of farmland and settlements, with fluctuating savanna cover and riparian forest regeneration. The integrated land degradation map showed that 86.1% of the basin remained unaffected, while 9% was moderately degraded and 4.9% was severely degraded. Most hotspots were concentrated in the southern and southeastern zones under high human pressure. These findings demonstrate that although climate variability shapes vegetation dynamics, anthropogenic activities are the primary drivers of degradation. The study provided empirical evidence to guide restoration initiatives, support targeted interventions, and inform regional sustainable land management strategies aligned with SDG 15.3.1.

土地退化降低了土壤肥力，改变了生态系统结构，导致生产力下降。研究分析了1992 - 2022年布基纳法索马西利河流域土地退化驱动因素的时空变化趋势。采用综合方法，结合气候（降水、温度、干旱指数）、生态（归一化植被差异指数（NDVI）、雨水利用效率（RUE））和人为（人类影响指数）指标，利用陆地卫星图像、气象记录、人口统计和媒介数据。结果显示，降雨量显著增加，气温略有下降，这些因素共同使该盆地从主要的半干旱状态转变为半湿润状态。尽管气候趋势发生了变化，但植被恢复并不均衡，NDVI显示南部盆地持续下降，中部和北部地区局部绿化，而由于非气候压力的影响，几个区域的RUE下降。土地利用和土地覆盖分析显示，农田和定居点明显扩大，稀树草原覆盖和河岸森林更新变化不定。综合土地退化图显示，流域86.1%的土地未受影响，9%的土地中度退化，4.9%的土地严重退化。大多数热点地区集中在人类活动压力较大的南部和东南部地区。这些发现表明，尽管气候变率影响植被动态，但人为活动是退化的主要驱动因素。该研究为指导恢复举措、支持有针对性的干预措施以及为符合可持续发展目标15.3.1的区域可持续土地管理战略提供了经验证据。

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