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Metagenomic insight reveals the microbial structure and function of nitrous oxide emission from agricultural ditches 宏基因组揭示了农业沟渠排放一氧化二氮的微生物结构和功能
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-02-02 DOI: 10.1016/j.jhydrol.2026.135085
Zhangmu Jing , Qingqian Li , Shengqiang Tu , Yanjie Wei , Peng Yuan , Xiaoling Liu , Hongjie Gao
Nitrous oxide (N2O) is a potent greenhouse gas, with agricultural activities representing its major source. However, the emission mechanism of nitrous oxide efficient by agricultural activities has not yet been fully studied. This study employs metagenomic analysis to elucidate the microbial community structure and functional potential associated with N2O emissions in river and ditch systems of the Yangtze River Delta. The N2O dissolved concentration in the rivers (0.08 ± 0.03 μmol N·L−1) was significantly lower than that in the ditches (0.21 ± 0.14 μ mol N·L−1) (P < 0.05). According to eight wind-based models, agricultural ditches emissions were 3.53–4.70 times higher than those of the rivers. All models significantly overestimated fluxes (P < 0.05), revealing a systematic overestimation of EF values when using the Intergovernmental Panel on Climate Change (IPCC) methodology. Particulate organic carbon supported microbial activity by providing energy and adhesion sites, while electrical conductivity (EC) served as an indicator of ion inputs from surrounding land use, serving as a critical abiotic driver of EF values in the ditches. The co-occurrence network showed that denitrification genes (norB, nirS, nosZ) formed a tightly clustered subnetwork exclusively in the ditches, indicating broader nitrification niches and stronger functional coupling among denitrifiers in these systems. Metagenomic evidence revealed that EF value correlated significantly with denitrification genes, notably napAB, nirK, norBC and nirK/nosZ (P < 0.05), underscoring denitrification as the primary biotic driver of N2O production. These findings demonstrate the value of metagenomic approaches in revealing microbial mechanisms behind N2O emissions and support the development of more accurate, EF estimates for greenhouse gas inventories in agricultural landscapes.
一氧化二氮(N2O)是一种强有力的温室气体,农业活动是其主要来源。然而,农业活动对氧化亚氮的有效排放机制尚未得到充分的研究。本研究采用宏基因组分析方法,探讨了长三角河沟系统中与N2O排放相关的微生物群落结构和功能潜力。河流中N2O溶解浓度(0.08±0.03 μmol N·L−1)显著低于沟渠中(0.21±0.14 μmol N·L−1)(P < 0.05)。根据八个基于风的模型,农业沟渠的排放量是河流排放量的3.53-4.70倍。所有模型都显著高估了通量(P < 0.05),表明在使用政府间气候变化专门委员会(IPCC)方法时,系统高估了EF值。颗粒有机碳通过提供能量和粘附位点来支持微生物活动,而电导率(EC)作为周围土地利用离子输入的指标,是沟渠中EF值的关键非生物驱动因素。共现网络表明,反硝化基因(norB, nirS, nosZ)在沟渠中形成了紧密聚集的子网络,表明这些系统中硝化生态位更广泛,反硝化菌之间的功能耦合更强。元基因组学证据显示,EF值与反硝化基因显著相关,尤其是napAB、nirK、norBC和nirK/nosZ (P < 0.05),强调反硝化是N2O产生的主要生物驱动因素。这些发现证明了宏基因组方法在揭示N2O排放背后的微生物机制方面的价值,并支持对农业景观中温室气体清单进行更准确的EF估算。
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引用次数: 0
Sensitivity and scale dependence of discretization and roughness in the hydrodynamic modeling of surface runoff caused by torrential rainfall 暴雨径流水动力模拟中离散化和粗糙度的敏感性和尺度依赖性
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-02-02 DOI: 10.1016/j.jhydrol.2026.135088
David Feldmann , Patrick Laux , Andreas Heckl , Marinko Nujić , Brian Böker , Manfred Schindler , Harald Kunstmann
Hydrodynamic surface runoff simulations are an effective method for assessing flash flood risks. In engineering, the lack of observations for model calibration poses a challenge. Therefore, understanding the sensitivity to specific model parameters is crucial for reliable flood protection planning. This study analyzes how surface discretization and roughness affect surface runoff generation and depression storage in a hydrodynamic 2D-model in a southern German alpine region.
We compare the runoff generation across five discretization methodologies at 211 selected locations within the model domain. These locations are associated with subcatchments ranging in size from 0.2 to 4 km2.
The discretization methodologies comprise a one-meter grid refined with survey data, a two-meter grid, a high-resolution and low-resolution irregular mesh and a four-meter grid. These are combined with seven different depth-dependent and constant roughness parameterizations.
The sensitivity analysis shows that a higher depth-dependent roughness is needed to achieve comparable results to those of a coarse resolution model. Significant differences were observed with varying roughness parameterizations and meshing approaches. Modest alterations to surface resolution have the potential to yield deviations of up to 20% in maximum runoff. Coarser resolution models tend to create artificial depressions, leading to unrealistic water storage on hillsides.
These findings aid in identifying the sources of sensitivity in hydrodynamic surface runoff modeling, especially in ungauged basins and provide guidance on specific model setups. This is particularly relevant given the continued use of coarse-resolution models due to computational constraints and the availability of various roughness parameterizations, while calibration data are scarce.
水动力地表径流模拟是评估山洪风险的有效方法。在工程中,缺乏用于模型校准的观测值是一个挑战。因此,了解对特定模型参数的敏感性对于可靠的防洪规划至关重要。本研究在德国南部高山地区的水动力2d模型中分析了地表离散化和粗糙度如何影响地表径流产生和洼地储存。我们比较了在模型域中211个选定位置的五种离散化方法的径流生成。这些地点与面积从0.2平方公里到4平方公里不等的子集水区有关。离散化方法包括用调查数据细化的1米网格、2米网格、高分辨率和低分辨率不规则网格以及4米网格。这些结合了7种不同的深度依赖和恒定粗糙度参数化。灵敏度分析表明,要获得与粗分辨率模型相当的结果,需要更高的深度相关粗糙度。不同的粗糙度参数化和网格划分方法观察到显著的差异。对地表分辨率的适度改变有可能使最大径流产生高达20%的偏差。较粗分辨率的模型倾向于制造人工洼地,导致山坡上不切实际的水储存。这些发现有助于确定水动力地表径流模型的敏感性来源,特别是在未测量的流域,并为具体的模型设置提供指导。考虑到由于计算限制和各种粗糙度参数化的可用性而继续使用粗分辨率模型,而校准数据很少,这一点尤为重要。
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引用次数: 0
Response of runoff and sediment transport process to climate change in the headwater regions of Yangtze River 长江源区径流输沙过程对气候变化的响应
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-02-02 DOI: 10.1016/j.jhydrol.2026.135079
Li Wang , Fan Zhang , Xiaonan Shi , Chen Zeng , Yao Chen , Xing Xu , Xudong Fu
Runoff and sediment transport process in high mountain areas are sensitive to climate change and important for downstream ecosystem. This study employs the SWAT model and General Circulation Models (GCMs) with consideration of cryosphere processes to assess climate change impacts on runoff and sediment transport in the Tuotuo River (TTR) basin, headwaters of the Yangtze River. The 4800–––5200  m elevation zone, covering 65.4% of the basin, contributes disproportionately to runoff (73.3%) and soil erosion (83.8%). Total runoff comprises 33.4% surface runoff, 21.3% lateral runoff, and 45.3% groundwater. From 1986 to 2014, warming and increased precipitation led to rising trends in total runoff and sediment flux, driven by increases in groundwater and lateral runoff. In contrast, surface runoff declines due to enhanced infiltration from surface thawing, resulting in reduced overland erosion and sediment deposition. Under future climate scenarios (2025–––2100), continued warming and wetting will further enhance infiltration and change runoff generation, with surface runoff expected to peak earlier in June. Consequently, total runoff and sediment flux are projected to increase, while soil erosion and deposition are likely to decrease. Partial Least Squares Structural Equation Modeling (PLS-SEM) indicates that both precipitation and temperature positively influence total runoff and sediment flux. Precipitation increases surface and lateral runoff and indirectly promotes erosion and sediment transport. Temperature enhances groundwater, lateral runoff and sediment flux, but reduces surface runoff, erosion and deposition. These findings offer a scientific basis for developing adaptive soil and water conservation strategies under a changing climate.
高山区径流输沙过程对气候变化敏感,对下游生态系统具有重要意义。利用SWAT模式和考虑冰冻圈过程的大气环流模式(GCMs),研究了气候变化对长江源区沱沱河流域径流输沙的影响。海拔4800 - 5200米的区域占流域面积的65.4%,对径流(73.3%)和土壤侵蚀(83.8%)的贡献不成比例。总径流包括33.4%的地表径流、21.3%的侧向径流和45.3%的地下水径流。1986 - 2014年,在地下水和侧向径流增加的驱动下,气候变暖和降水增加导致总径流和泥沙通量呈上升趋势。相比之下,由于地表融化的入渗增强,地表径流减少,导致地面侵蚀和泥沙沉积减少。在未来的气候情景下(2025 - 2100年),持续的升温和湿润将进一步增强入渗并改变径流生成,地表径流预计将在6月早些时候达到峰值。因此,预计总径流和泥沙通量将增加,而土壤侵蚀和沉积可能减少。偏最小二乘结构方程模型(PLS-SEM)表明,降水和温度对径流和输沙通量均有正向影响。降水增加地表径流和侧向径流,间接促进侵蚀和输沙。温度增加了地下水、侧向径流和沉积物通量,但减少了地表径流、侵蚀和沉积。这些发现为在气候变化条件下制定适应性水土保持策略提供了科学依据。
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引用次数: 0
Impact of vegetation greening on runoff under climate change in the Yarlung Tsangpo-Brahmaputra River basin 气候变化下雅鲁藏布江流域植被绿化对径流的影响
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-02-01 DOI: 10.1016/j.jhydrol.2026.135072
Haoyang Lyu , Fuqiang Tian , Yi Nan , Liming Wang , Mahmut Tudaji
As a result of climate change and global warming, vegetation greening can influence the hydrological processes of river basins. This study evaluated the possible impact of vegetation greening under the CMIP6 SSP585 scenario on the runoff volume till 2100 at key sections of the Yarlung Tsangpo-Brahmaputra River, which is renowned for its abundant hydropower resources and the complex relations among riparian countries and regions. From 2020 to 2100, with the greening vegetation, annual runoff at Bahadurabad can decrease by 3 to 31 billion m3 on average. Water yield decline brought by vegetation greening frequently happens in upper and middle reaches of the basin. The decrease in runoff also shows significant seasonal characteristics. The main peak of runoff reduction usually occurs during the monsoon season from June to October. The sensitivity analysis shows that the greening of areas with less current vegetation distribution is the more significant factor causing runoff reduction than the increasing lushness of existing vegetation. Dominance of vegetation coverage (FVC) and lushness (LAI) can also vary in different areas of the basin. The findings of this study underscore the importance of accurately predicting the spatial distribution of vegetation species and their temporal dynamics in hydrological modeling. The enhanced understanding of runoff tendency under climate change and vegetation evolution would help supporting more precise management of water resources in large transboundary river basins, promoting basin-wide cooperation, and increasing the efficiency of climate adaptation.
由于气候变化和全球变暖的影响,植被绿化可以影响流域的水文过程。本研究评估了CMIP6 SSP585情景下植被绿化对雅鲁藏布江关键河段至2100年径流量的可能影响。雅鲁藏布江以其丰富的水电资源和复杂的沿江国家和地区关系而闻名。2020 - 2100年,随着植被的绿化,巴哈杜拉巴德年径流量可平均减少30 - 310亿m3。流域中上游频繁发生植被绿化带来的出水量下降。径流减少也表现出明显的季节特征。径流减少的主要高峰通常出现在6月至10月的季风季节。敏感性分析表明,现有植被分布较少的地区的绿化比现有植被的繁茂度增加对径流减少的影响更显著。植被覆盖度(FVC)和郁郁葱葱度(LAI)的优势度在流域不同区域也存在差异。本研究结果强调了准确预测植被物种的空间分布及其时间动态在水文建模中的重要性。加强对气候变化和植被演变下径流趋势的认识,有助于更精确地管理大型跨界河流流域的水资源,促进全流域合作,提高气候适应效率。
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引用次数: 0
High-resolution modelling of dissolved organic carbon dynamics in a boreal nested catchment: insights from the Krycklan-HYPE model 北方地区嵌套集水区溶解有机碳动态的高分辨率建模:来自Krycklan-HYPE模型的见解
IF 6.4 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-01-31 DOI: 10.1016/j.jhydrol.2026.135039
Renkui Guo, Andrea L. Popp, Martin Berggren, Junzhi Liu, Jiaojiao Liu, David Gustafsson, Zheng Duan
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引用次数: 0
AVFF-RI: an improved rainfall intensity measurement using common cameras AVFF-RI:一种改进的降雨强度测量,使用普通相机
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-01-31 DOI: 10.1016/j.jhydrol.2026.135045
Manuel Fiallos-Salguero , Soon-Thiam Khu , Mingna Wang
Rainfall measurements and modelling have faced a critical bottleneck due to data scarcity and limited performance of conventional methods, hindering precision in urban hydrology applications. In contrast, surveillance cameras have emerged as a cost-effective alternative for rainfall monitoring, although continuous detection remains computationally intensive due to the increasing variability and intensity of rainfall events. To tackle this, we propose AVFF-RI, a novel audio-visual fusion framework that leverages temporally resolved information from spatially distributed surveillance cameras for reliable rainfall estimation. The proposed framework is based on a two-stage approach for modality-specific pre-processing, followed by an adaptive fusion stage, which addresses the challenges of ambient noise, visual obstructions, and environmental conditions. The pre-processing stage includes a denoising network to isolate rainfall acoustic features from audio recordings, and a dual-stream detection scheme to extract rain streaks while removing visual distractors. Thus, these enhanced features are fused using a tailored multimodal regression model, improved with a bidirectional GRU-based adaptive fusion strategy that dynamically weights modality relevance and captures spatial and temporal dependencies. The framework evaluation was across varying rainfall events and conditions at two locations, demonstrating the AVFF-RI robustness, with R2 ranging from 0.87 to 0.91 and mean absolute percentage errors ranging from 5.9% to 13.7%. Compared to unimodal and alternative fusion models, AVFF-RI exhibited lower error metrics and better generalization, underlining its effectiveness through late adaptive fusion and attention-guided weighting. This study highlights the viability of scalable rainfall estimation using widely deployed surveillance infrastructure, contributing to urban hydrology and disaster response systems.
由于数据稀缺和传统方法的性能有限,降雨测量和建模面临着一个关键的瓶颈,阻碍了城市水文应用的精度。相比之下,监控摄像机已成为一种具有成本效益的降雨监测替代方案,尽管由于降雨事件的变异性和强度不断增加,连续检测仍然需要大量计算。为了解决这个问题,我们提出了AVFF-RI,这是一种新的视听融合框架,利用来自空间分布的监控摄像机的时间分辨信息进行可靠的降雨估计。所提出的框架基于两阶段方法,用于模态特定的预处理,然后是一个自适应融合阶段,该阶段解决了环境噪声、视觉障碍和环境条件的挑战。预处理阶段包括一个去噪网络,从录音中分离降雨声学特征,以及一个双流检测方案,在去除视觉干扰的同时提取雨条。因此,使用定制的多模态回归模型融合这些增强的特征,并使用基于gru的双向自适应融合策略进行改进,该策略动态加权模态相关性并捕获空间和时间依赖性。框架评估在两个地点不同的降雨事件和条件下进行,证明了AVFF-RI的稳健性,R2范围为0.87 ~ 0.91,平均绝对百分比误差范围为5.9% ~ 13.7%。与单模和备选融合模型相比,AVFF-RI具有更低的误差指标和更好的泛化,强调了其通过后期自适应融合和注意引导加权的有效性。这项研究强调了使用广泛部署的监测基础设施进行可扩展的降雨估计的可行性,有助于城市水文和灾害响应系统。
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引用次数: 0
Land cover influences microclimate and non-rainfall water inputs in temperate agricultural environment 在温带农业环境中,土地覆被影响小气候和非降雨水的投入
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-01-31 DOI: 10.1016/j.jhydrol.2026.135040
Jannis Groh , Thomas Pütz , Daniel Beysens , Joan Cuxart , Nurit Agam , Werner Küpper , Paul D. Colaizzi , Harry Vereecken , Horst H. Gerke , Wulf Amelung
Non-rainfall water inputs (NRWI) from dew, fog, frost, rime and soil water vapour adsorption (WVA) are key components of the terrestrial water cycle, but their individual contribution to the water budget is unclear due to a lack of suitable methods for identification and quantification. Here, we present a refined method to quantify and partition NRWI using weighing lysimeters. The method’s novelty lies in the variables used to determine when dew and frost (leaf-wetness), fog and rime (air visibility) occur. We applied this methodology to grassland and arable land lysimeters and compared it to the established method that relies on relative humidity and estimated dew-point temperature to quantify and partition NRWI.
Our results showed large differences between the refined and established method. The established method predicted larger amounts of dew (55 %) and WVA (2522 %), but no fog. NRWI mostly came from dew. Dew rates per event were generally higher on arable land, but the total amount of dew was larger on grassland due to higher frequency of dew formation. Dew amount differences could be attributed to land cover type, which promoted dew formation in the grassland while the arable ecosystem largely lost water through evapotranspiration (e.g. stomatal conductance, canopy-structure). We conclude that land cover type is a key control for microclimate (surface temperature, relative humidity), which significantly affects dew formation, while effects on fog or WVA are weaker. These effects are better determined by lysimeter assessment with a visibility and leaf-wetness device than by other existing NRWI identification systems.
来自露水、雾、霜、霜和土壤水蒸气吸附(WVA)的非降雨水输入(NRWI)是陆地水循环的关键组成部分,但由于缺乏合适的识别和量化方法,它们对水收支的单独贡献尚不清楚。在这里,我们提出了一种改进的方法来量化和划分NRWI使用称重渗滤仪。该方法的新颖之处在于,它使用了一些变量来确定露水和霜(叶片湿度)、雾和霜(空气能见度)何时出现。我们将该方法应用于草地和耕地蒸渗仪,并与现有的依赖相对湿度和估计露点温度来量化和划分NRWI的方法进行比较。结果表明,改进后的方法与建立的方法存在较大差异。所建立的方法预测了大量的露水(55%)和WVA(2522%),但没有雾。NRWI主要来自露水。耕地的单事件结露率普遍较高,但草地因结露频率较高,总结露量较大。露量的差异可归因于土地覆被类型的不同,草地的土地覆被类型促进了露量的形成,而耕地生态系统的水分主要通过蒸散发(如气孔导度、冠层结构)流失。研究结果表明,土地覆被类型是控制小气候(地表温度、相对湿度)的关键因素,对露水形成有显著影响,而对雾和WVA的影响较弱。与其他现有的NRWI识别系统相比,使用带有能见度和叶片湿度装置的渗湿计评估可以更好地确定这些影响。
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引用次数: 0
Enhancing SWAT with mechanistic plant hydraulics: development and application in the Hanjiang River Basin 利用机械水力学加强SWAT:在汉江流域的开发与应用
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-01-31 DOI: 10.1016/j.jhydrol.2026.135066
Xiaoqiang Wei , Shuai Xie , Boyu Zhang , Lingcheng Li , Quan Zhang
Plant transpiration plays a critical role in global water and energy cycles, requiring better process understanding as climate change intensifies drought stress and alters plant responses. Most hydrological models such as the widely-used SWAT lack representation of plant hydraulics, the mechanistic processes controlling plant water regulation and transpiration. This study developed SWAT-PHS by integrating a plant hydraulics scheme (PHS) into SWAT hydrological model, enabling explicit simulation of root water uptake, sap flow, storage and transpiration at 30-minute timescales for watershed-scale modeling. In the Hanjiang River Basin, SWAT-PHS mitigated overestimation of runoff during the rainy season and underestimation during the dry season, reducing the overall simulation error by 29% across the entire simulation period. The model can simulate reasonable plant water dynamics, including diurnal transpiration patterns and drought responses showing declining transpiration flux, hydraulic buffering through stem water storage, and depth-dependent root water uptake strategies. Sensitivity analysis shows that SWAT-PHS captured mechanistic relationships between plant hydraulic traits and transpiration, with root distribution and stem capacitance positively affecting annual transpiration while vulnerability parameters showed negative effects. This work provides a pathway for improving hydrologic modeling and water resource management by better representing plant water regulation under climate change and expected intensifying water stress conditions.
植物蒸腾在全球水和能量循环中发挥着关键作用,随着气候变化加剧干旱胁迫和改变植物反应,需要更好地了解这一过程。大多数水文模型,如广泛使用的SWAT,缺乏植物水力学的表征,即控制植物水分调节和蒸腾的机械过程。本研究通过将植物水力学方案(PHS)集成到SWAT水文模型中,开发了SWAT-PHS,能够在30分钟的时间尺度上明确模拟根系水分吸收、液流、储存和蒸腾,用于流域尺度建模。在汉江流域,SWAT-PHS缓解了雨季对径流的高估和旱季对径流的低估,使整个模拟周期的总体模拟误差降低了29%。该模型可以模拟合理的植物水分动态,包括日蒸腾模式和干旱响应,显示蒸腾通量下降、茎储水的水力缓冲以及深度依赖的根系水分吸收策略。敏感性分析表明,SWAT-PHS捕获了植物水力性状与蒸腾之间的机制关系,根系分布和茎容量对年蒸腾有正向影响,而易损性参数对年蒸腾有负向影响。该研究通过更好地反映气候变化和预期加剧的水分胁迫条件下植物的水分调节,为改善水文建模和水资源管理提供了途径。
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引用次数: 0
Quantifying the uncertainty contribution in runoff projection and the time scale effects 量化径流预测中的不确定性贡献和时间尺度效应
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-01-31 DOI: 10.1016/j.jhydrol.2026.135067
Zhanling Li , Yingtao Ye , Cheng Xie , Xiaoyan Zhai
Quantifying the uncertainty contribution in hydrological projections from various factors has received much attention in hydrological science. However, how the contributions respond to the changes of hydrological forecasting period has not received enough attention so far. This study focused on quantifying the uncertainty contributions of different factors to hydrological projections and exploring their time scale effects. Taking the upper Heihe River Basin (UHRB) and the upper Yalong River Basin (UYRB) as the study areas, this study employed the time-series analysis of variance method to explore the contributions of four modeling chain factors and the internal variability of hydrological system to the uncertainty of runoff projection. The results indicate that, for short-term hydrological forecasting of less than 20 years, the internal variability of the system is the main source of uncertainty, basically explaining more than 50% of the total uncertainty in Qmean, Q10, and Q90 projections for both basins. As the time scale increases, the contribution from the internal variability gradually weakens, and that from the modeling chain strengthens. When the time scale reaches 35 years, the impacts of the internal variability and the modeling chain on forecast results reach a relatively balanced state. For the 75-year long-term hydrological forecasting, the modeling chain is the main source of uncertainty, explaining 80–87% of the total uncertainty in Qmean, Q10, and Q90 projections for both basins. In the modeling chain, the general circulation model contributes most to the total uncertainty for the UYRB and the forecast model contributes most for the UHRB.
在水文科学中,如何量化各种因素对水文预估的不确定性贡献受到了广泛关注。然而,这些贡献如何响应水文预报周期的变化,目前还没有得到足够的重视。本研究的重点是量化不同因素对水文预估的不确定性贡献,并探讨其时间尺度效应。本研究以黑河上游和雅砻江上游为研究区,采用时间序列方差分析方法,探讨4个建模链因子和水文系统内部变率对径流预测不确定性的贡献。结果表明,在20年以内的短期水文预报中,系统内部变率是不确定性的主要来源,对两个流域Qmean、Q10和Q90预估的不确定性贡献率基本达到50%以上。随着时间尺度的增加,内部变率的贡献逐渐减弱,而模拟链的贡献增强。当时间尺度达到35年时,内部变率和模式链对预测结果的影响达到相对平衡的状态。对于75年长期水文预报,模拟链是不确定性的主要来源,解释了两个流域Qmean、Q10和Q90预估中总不确定性的80-87%。在模拟链中,一般环流模式对UHRB的总不确定性贡献最大,预报模式对UHRB的总不确定性贡献最大。
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引用次数: 0
Global quantification of the bidirectional dependence between vegetation productivity and multi-layer soil moisture 植被生产力与多层土壤水分双向依赖关系的全球量化
IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL Pub Date : 2026-01-30 DOI: 10.1016/j.jhydrol.2026.135065
Ying Liu, Jiumeilin Shi, Hui Yue, Xu Wang
Soil moisture serves as a crucial water source for vegetation growth, while vegetation dynamics in turn regulate soil moisture through processes such as evapotranspiration and canopy interception. Quantitatively characterizing this mutual feedback is essential for optimizing hydrological processes and promoting coordinated vegetation–water management. However, the bidirectional interactions between soil moisture and vegetation productivity across different climate zones, vegetation types, and soil depths remain poorly understood. Based on Global Solar Induced Chlorophyll Fluorescence, soil moisture, the average air temperature at 2 m, and solar radiation datasets, this study employed trend analysis, causal inference, and multiple linear regression to explore the Granger causality between vegetation productivity and multi-layer soil moisture under different environmental conditions. Results revealed widespread bidirectional dependence between vegetation productivity and soil moisture across all soil layers, with interaction strength declining from 79.84% in the surface layer (0–10 cm) to 72.04% in the deep layer (100–200 cm). The magnitude of this bidirectional coupling varied significantly across climate zones: dependence peaked in surface soils within temperate regions (82.52%), while tropical zones exhibited maxima in the shallow (82.99%) and deep (78.05%) layers. Boreal zones showed the strongest dependence in the middle soil layer (76.25%). Furthermore, driven by differences in transpiration rates and water retention capacity, woody plants demonstrated higher average bidirectional dependence (79.4%) than herbaceous plants (75.75%), whereas shrubland vegetation exhibited relatively lower dependence (74%). Considering the spatial distribution of climate and vegetation types, tropical zones (dominated by evergreen broadleaf forests) and boreal zones (dominated by shrublands) both showed peak bidirectional dependence in the shallow soil layer. Other climate zones, primarily influenced by grassland vegetation, exhibited peak dependence within the surface soil layer. This study reveals the variability in bidirectional dependence between vegetation productivity and multilayer soil moisture across different climatic zones and vegetation types, which will provide a robust theoretical foundation for improving regional soil moisture regulation and guiding ecosystem restoration under changing climatic conditions.
土壤水分是植被生长的重要水源,而植被动态又通过蒸散发和冠层截流等过程调节土壤水分。定量表征这种相互反馈对于优化水文过程和促进协调的植被-水管理至关重要。然而,在不同气候带、植被类型和土壤深度中,土壤水分与植被生产力之间的双向相互作用仍然知之甚少。基于全球太阳诱导叶绿素荧光、土壤湿度、2 m平均气温和太阳辐射数据,采用趋势分析、因果推理和多元线性回归等方法,探讨不同环境条件下植被生产力与多层土壤湿度之间的格兰杰因果关系。结果表明,各土层植被生产力与土壤水分存在广泛的双向依赖关系,交互作用强度从表层(0 ~ 10 cm)的79.84%下降到深层(100 ~ 200 cm)的72.04%。这种双向耦合的程度在不同气候带之间存在显著差异:温带地区表层土壤的依赖性最大(82.52%),而热带地区表层土壤的依赖性最大(82.99%),深层土壤的依赖性最大(78.05%)。寒带对中层土壤的依赖性最强(76.25%)。此外,在蒸腾速率和保水能力差异的驱动下,木本植物的平均双向依赖(79.4%)高于草本植物(75.75%),而灌木植被的平均双向依赖(74%)相对较低。从气候和植被类型的空间分布来看,热带地区(常绿阔叶林为主)和寒带地区(灌丛为主)在浅层土壤中均表现出最大的双向依赖性。其他气候带主要受草地植被影响,在表层土壤中表现出峰值依赖性。该研究揭示了不同气候带和植被类型下植被生产力与多层土壤水分双向依赖关系的变异,为气候变化条件下改善区域土壤水分调节和指导生态系统恢复提供了坚实的理论基础。
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Journal of Hydrology
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