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Regional patterns of parameter sensitivity in the plant hydraulics scheme of Noah-MP: Insights into plant-water interactions Noah-MP植物水力学方案中参数敏感性的区域模式:植物-水相互作用的见解
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2026-01-05 DOI: 10.1016/j.agrformet.2026.111018
Weijing Chen , Jinliang Hou
A plant hydraulic scheme (PHS) integrated into Noah-MP improves the simulation of hydrological processes, yet its impacts on key variables remain unclear. This study employs a global sensitivity analysis method (the Sobol’ indices) to identify the key parameters in the PHS scheme that affecting evapotranspiration (ET), soil moisture (SMC), gross primary productivity (GPP), and water flux absorbed by the plant roots (Qroot). By combining model simulations, stations measurements and satellite data, this study conducts a systematic analysis of the sensitivity of each parameter to various variables and evaluates the spatial variability of the sensitivity. Additionally, the influence of three climate-related factors—aridity index, precipitation, and vapor pressure deficit—on the regional sensitivity pattern of parameters was investigated. The results indicate that the Sobol’ indices of individual parameters show noticeable differences depending on the data source. Overall, TLP(leaf turgor loss water potential) and Ks,sat(xylem saturated water conductivity) exert a significant influence on ET and GPP, while the simulation of SMC and Qroot is jointly affected by multiple parameters, with ri(root distribution parameter) and Cstem(stem volume specific water capacitance) taking the leading roles, respectively. Although the dominant parameters vary across regions, their sensitivity indices show no strong correlation with the three climate factors examined. Furthermore, the model’s simulation accuracy was validated against observation data from both stations and satellite. The evaluation indicates that ET, GPP, and Qroot are simulated with relatively high accuracy, although the performance declines in arid regions. In contrast, the simulation accuracy of SMC exhibits greater spatial variability and performs worse in areas with dense vegetation cover. The findings suggest that identifying region-specific sensitive parameters can provide valuable guidance for model parameter optimization. Targeted parameter optimization or the integration of new schemes can significantly enhance the simulation of specific variables.
整合到Noah-MP中的植物水力方案(PHS)改善了水文过程的模拟,但其对关键变量的影响尚不清楚。本研究采用全局敏感性分析方法(Sobol指数)识别小PHS方案中影响蒸散发(ET)、土壤湿度(SMC)、总初级生产力(GPP)和植物根系吸收水量(Qroot)的关键参数。结合模式模拟、台站实测和卫星数据,系统分析了各参数对各变量的敏感性,并评价了敏感性的空间变异性。此外,还研究了干旱指数、降水和水汽压亏缺3个气候相关因子对各参数区域敏感性的影响。结果表明,不同数据源下各参数的Sobol指数存在显著差异。总体而言,TLP(叶片膨松损失水势)和Ks,sat(木质部饱和水电导率)对ET和GPP有显著影响,而SMC和Qroot的模拟受多个参数的共同影响,其中ri(根系分布参数)和system(茎体积比水电容)分别起主导作用。虽然主导参数在区域间存在差异,但其敏感性指数与3种气候因子的相关性不强。通过台站和卫星观测资料验证了模型的模拟精度。结果表明,在干旱区,模拟ET、GPP和Qroot具有较高的精度,但精度有所下降。SMC的模拟精度空间变异性较大,在植被覆盖较密的地区表现较差。研究结果表明,区域敏感参数的识别可以为模型参数优化提供有价值的指导。有针对性的参数优化或新方案的集成可以显著增强特定变量的模拟效果。
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引用次数: 0
Evaluating ecosystem water use efficiency and recovery dynamics during flash droughts: insights from observations and model simulations 评估突发性干旱期间生态系统水分利用效率和恢复动态:来自观测和模式模拟的见解
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2025-12-13 DOI: 10.1016/j.agrformet.2025.110982
Yuefeng Hao , Jiafu Mao , Yaoping Wang , Lianhong Gu , Jeffrey Wood , Paul J. Hanson , Melanie A. Mayes , Mingzhou Jin , Peter E. Thornton , Xiaoying Shi , Daniel M. Ricciuto
Flash droughts (FD), rapidly emerging in a warming future, disrupt ecosystems, agriculture, and water security. Ecosystem water use efficiency (WUE), the ratio of gross primary production (GPP) to actual evapotranspiration (AET), balances carbon assimilation and water loss. FD rapidly disrupts this balance, making WUE critical for assessing plant stress and recovery. This study investigates the dynamics of landscape-scale WUE, and the components of GPP and AET under FD utilizing both observed data from the Missouri Ozark AmeriFlux site (US-MOz) and version 2 of the U.S. Department of Energy’s Earth, Energy, Exascale System Model (E3SM) Land Model (ELMv2). Observations and simulations reveal GPP as dominant for WUE during earlier FD events (2005, 2007, 2012), shifting to AET in recent events (2014, 2018). This agreement indicates that the ELM can capture the shifting dynamics of GPP and AET in regulating WUE under FD conditions. However, the ELM systematically underestimates both GPP and AET and does so in a manner that does not preserve their ratio. As a result, WUE is also underestimated, suggesting that GPP is more strongly underestimated than AET. Furthermore, the ELM also underestimates the speed of GPP recovery, producing an artificially prolonged GPP recovery time following FD events. Observed environmental drivers such as vapor pressure deficit (VPD), soil moisture (SM), and predawn leaf water potential (PLWP) effectively predict WUE, but ELM primarily highlights SM, underestimating VPD’s role. This study demonstrates that relying solely on soil moisture fails to capture the rapid hydraulic recovery observed in PLWP, underscoring the necessity of integrating plant hydraulics into land surface models to improve flash drought predictability.
在全球变暖的未来,突发性干旱(FD)会迅速出现,破坏生态系统、农业和水安全。生态系统水分利用效率(WUE),即总初级生产量(GPP)与实际蒸散(AET)之比,平衡了碳同化和水分流失。FD迅速破坏了这种平衡,使水分利用效率成为评估植物胁迫和恢复的关键。本研究利用密苏里Ozark AmeriFlux站点(US-MOz)和美国能源部地球、能源、百亿次系统模型(E3SM)陆地模型(ELMv2)的第2版观测数据,研究了FD下景观尺度WUE的动态变化,以及GPP和AET的组成。观测和模拟显示,在早期FD事件(2005年、2007年、2012年)中,GPP是WUE的主导因素,在最近的事件(2014年、2018年)中转向AET。这表明,在FD条件下,ELM可以捕捉GPP和AET在调节WUE方面的变化动态。然而,ELM系统地低估了GPP和AET,并没有保持它们的比例。因此,WUE也被低估了,说明GPP比AET被严重低估。此外,ELM还低估了GPP的恢复速度,人为地延长了FD事件后的GPP恢复时间。观测到的环境驱动因素如水汽压亏缺(VPD)、土壤湿度(SM)和黎明前叶片水势(PLWP)可以有效预测水分利用效率,但ELM主要强调SM,低估了VPD的作用。该研究表明,仅依靠土壤湿度无法捕捉PLWP观测到的快速水力恢复,强调了将植物水力学纳入陆地表面模型以提高突发性干旱可预测性的必要性。
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引用次数: 0
Comprehensive review of detrending methods for crop yields: Approaches, applications, and future directions 作物产量趋势分析方法综述:方法、应用和未来发展方向
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2026-01-10 DOI: 10.1016/j.agrformet.2026.111017
Yanbo He, Xianglong Chen, Haijun Li, Xuan Li, Shaojie Sun, Menxin Wu
Against the backdrop of the severe challenges posed by global climate change and food insecurity, accurate yield forecasting is critically important for agricultural risk management, policymaking, and resource allocation. Crop yields result from the combined effects of meteorological conditions and advances in agricultural technology. A key scientific challenge in yield forecasting is accurately distinguishing short-term yield fluctuations caused by weather variability from long-term trends driven by technological progress. This separation is essential for producing reliable datasets that support the analysis of yield variability and predictive modeling. For decades, the detrending of crop yields has been a central focus in fields such as agricultural meteorology and crop science. This paper systematically reviews the development of detrending techniques in yield forecasting over the past six decades, from traditional linear and polynomial methods to advanced machine learning algorithms and multi-model integration approaches in recent years. It thoroughly examines the theoretical foundations, advantages and limitations, application scenarios, performance variations, and empirical outcomes of different detrending methods. The analysis reveals that the choice of method can significantly influence research outcomes, with important implications for climate change impact assessments, agricultural policymaking, crop yield forecasting, and food security planning. Furthermore, the paper highlights current research hotspots and challenges while outlining future directions and development trends in the field. This paper offers a systematic perspective on understanding the evolving trends in crop yields and proposes that future research should focus on adaptive and dynamic detrending algorithms, uncertainty quantification, integration of external variables, standardization of methods, and the use of big data resources. This comprehensive assessment provides both methodological guidance for researchers and a strategic roadmap for advancing the study of detrending techniques in agricultural yield analysis.
在全球气候变化和粮食不安全带来严峻挑战的背景下,准确的产量预测对农业风险管理、政策制定和资源配置至关重要。农作物产量是气象条件和农业技术进步共同作用的结果。产量预测的一个关键科学挑战是准确区分由天气变化引起的短期产量波动和由技术进步驱动的长期趋势。这种分离对于生成支持产量变异性分析和预测建模的可靠数据集至关重要。几十年来,作物产量趋势一直是农业气象学和作物科学等领域的中心焦点。本文系统回顾了过去六十年来产量预测中去趋势技术的发展,从传统的线性和多项式方法到近年来先进的机器学习算法和多模型集成方法。全面考察了不同趋势方法的理论基础、优势和局限性、应用场景、性能变化和实证结果。分析表明,方法的选择可以显著影响研究成果,对气候变化影响评估、农业政策制定、作物产量预测和粮食安全规划具有重要意义。此外,本文还强调了当前的研究热点和挑战,并概述了该领域的未来方向和发展趋势。本文从系统的角度理解了作物产量的演变趋势,并提出未来的研究应侧重于自适应和动态去趋势算法、不确定性量化、外部变量的整合、方法的标准化以及大数据资源的利用。这一综合评估既为研究人员提供了方法论指导,也为推进农业产量分析中趋势化技术的研究提供了战略路线图。
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引用次数: 0
Northeast Italian viticulture affected by heat and vegetation stress. A satellite-based study from 2000 to 2024 炎热和植被胁迫对意大利东北部葡萄栽培的影响。从2000年到2024年的卫星研究
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.agrformet.2025.110962
Vincenzo Baldan, Eugenio Straffelini, Vincenzo D’Agostino, Paolo Tarolli
The impact of extreme temperatures on viticulture in northeastern Italy is emerging as a significant risk for farmers due to the changing climate. Rising temperatures and stronger heatwaves are exacerbating the frequency of heat and the vegetation stress on the phenology of the plants. However, the influence of climate change in extreme surface temperature and the frequency of the vegetation stress over the years in northeastern Italy’s vineyards is still less explored. This study aims to analyse daytime and nighttime Land Surface Temperature (LST) and the Vegetation Health Index (VHI) from 2000 to 2024. The frequency distribution of extreme temperatures and vegetation stress was analysed using satellite data from the MODIS dataset, also considering three main vineyard classes. The study was conducted using Google Earth Engine platform, followed by a non-parametric trend analysis assessment. Results shows that nighttime LST is increasing significantly across the study area, while the daytime LST shows a significant increasing trend in flat vineyards, which are also more exposed to heat and vegetation stress. In contrast, steep and heroic vineyards are more affected by higher night temperatures. The VHI is getting worse in most of the study area, while the occurrences of the stress level increased in the 2020–2024 period. The findings could be used for structure guidelines for policy makers to design strategies to mitigate the impacts on vineyards. This work aims to stimulate further research into the effects of climate change on land surface temperature and vegetation stress in the Italian viticulture.
由于气候变化,极端气温对意大利东北部葡萄种植业的影响正成为农民面临的重大风险。不断上升的气温和更强的热浪加剧了高温的频率,也加剧了植物物候上的植被压力。然而,气候变化对极端地表温度的影响以及多年来意大利东北部葡萄园植被压力的频率仍然很少被探索。本研究旨在分析2000 - 2024年白天和夜间地表温度(LST)和植被健康指数(VHI)。利用MODIS数据集的卫星数据分析了极端温度和植被应力的频率分布,并考虑了三个主要的葡萄园类别。研究使用谷歌Earth Engine平台进行,随后进行非参数趋势分析评估。结果表明:夜间地表温度在整个研究区呈显著上升趋势,而白天地表温度在平坦葡萄园呈显著上升趋势,且平坦葡萄园更容易受到高温和植被胁迫;相比之下,陡峭而英勇的葡萄园更容易受到夜间高温的影响。在2020-2024年期间,大部分研究区VHI呈恶化趋势,而应力水平的发生次数有所增加。研究结果可以为政策制定者提供结构指导,以设计减轻对葡萄园影响的策略。这项工作旨在促进气候变化对意大利葡萄栽培中地表温度和植被胁迫的影响的进一步研究。
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引用次数: 0
Using point dendrometers to improve forest transpiration estimation accuracy at stand scales 利用点树木计提高林分尺度森林蒸腾估算精度
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2025-12-16 DOI: 10.1016/j.agrformet.2025.110986
Ryan M. Bright , Danielle Creek , Holger Lange , Helge Meissner , Morgane Merlin , Junbin Zhao
Forest transpiration is often quantified by scaling up stem sap flow measured on a few trees within a stand. This procedure carries uncertainty related to the (ill)representativeness of the sampled trees for the entire stand, often comprising several thousand transpiring trees. Here, we explored the uncertainty reduction potential afforded by increasing the number of sampled trees within the stand – not by costly sap flow monitoring equipment – but by point dendrometers measuring sub-daily fluctuations in stem radii which partially correlate with xylem water movement (i.e., sap flow). Using measurements collected in a forest dominated by even-aged spruce trees over two growing seasons, we built an empirical model for estimating hourly sap flow from individual trees equipped with point dendrometers, then applied it to estimate the daily transpiration of the stand both with and without trees equipped with point dendrometers. We found that the expanded tree sample size reduced the uncertainty of the stand-level estimate by 31–37 %, suggesting that the benefit afforded by increasing the stand representativeness outweighed the cost of introducing modeling error. Given their relative simplicity and affordability, we encourage additional investigations into the use of point dendrometers for studying tree water relations and water consumption patterns of entire forested stands.
森林蒸腾作用通常是通过在一个林分内的几棵树上按比例测量茎液流来量化的。这一过程具有与整个林分(通常包括数千棵蒸腾树)取样树木的(不良)代表性相关的不确定性。在这里,我们探索了通过增加林分内采样树木的数量来减少不确定性的潜力——不是通过昂贵的液流监测设备——而是通过测量与木质部水分运动(即液流)部分相关的茎半径次日波动的点树木计。利用两个生长季节在均龄云杉为主的森林中采集的数据,我们建立了一个经验模型来估算每小时的树液流量,然后将其应用于估算有树和没有树的林分的日蒸腾。我们发现,扩大的树木样本量将林分水平估算的不确定性降低了31 - 37%,这表明增加林分代表性所带来的好处超过了引入建模误差的成本。鉴于点树木密度计相对简单和可负担,我们鼓励进一步研究点树木密度计的使用,以研究树木的水分关系和整个林分的水消耗模式。
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引用次数: 0
Critical snowpack thresholds and escalating risks for extreme decreases in vegetation productivity across Northern Hemisphere ecosystems 北半球生态系统植被生产力极端下降的关键积雪阈值和不断上升的风险
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2025-12-16 DOI: 10.1016/j.agrformet.2025.110992
Hao Liu , Pengfeng Xiao , Xueliang Zhang , Xin Miao , Bo Tang , Yantao Liu , Siyong Chen , Gareth Rees , Weimin Ju
Seasonal snowpack is a key driver of vegetation productivity dynamics, but it is unclear at which levels of snowpack changes cause extreme decreases in vegetation productivity (EDVP), increasing the uncertainty in assessing the terrestrial carbon cycle. Here, we investigate the impact of different levels of snowpack changes on EDVP and identify the roles of different ecological processes of snowpack changes in the Northern Hemisphere (NH). The results show that over 30 % of snowpack decrease events are followed by EDVP events in ∼10 % of NH areas (p < 0.05), which is mainly attributed to snowpack’s moisture effect (via altering soil moisture). On average, the response of EDVP to snowpack changes increases rapidly when snow water equivalent (SWE) is –0.85 standard deviations (σ) below the mean, peaking at –1.33σ. Moreover, vegetation in warm and dry regions, especially grasslands, is more vulnerable to decreased SWE, and its resistance significantly increases with increasing precipitation. The future risk of EDVP occurrence will significantly increase in more regions owing to decreased snowpack, with ∼8 % of NH areas experiencing EDVP annually after ∼2083 under SSP5-8.5 scenario. Our findings underscore the significance of decreased snowpack in regulating EDVP and provide insights for better projecting and mitigating ecological consequences of snowpack changes.
季节性积雪是植被生产力动态的关键驱动因素,但目前尚不清楚积雪变化在何种程度上导致植被生产力(EDVP)的极端下降,这增加了陆地碳循环评估的不确定性。在此基础上,研究了北半球不同程度积雪变化对EDVP的影响,并确定了不同生态过程在积雪变化中的作用。结果表明,在约10%的NH地区,超过30%的积雪减少事件之后是EDVP事件(p < 0.05),这主要归因于积雪的水分效应(通过改变土壤水分)。平均而言,当雪水当量(SWE)低于平均值-0.85标准差(σ)时,EDVP对积雪变化的响应迅速增加,在-1.33σ处达到峰值。温暖干燥地区植被,尤其是草地,更容易受到SWE降低的影响,其抵抗能力随降水量的增加而显著增强。由于积雪减少,未来EDVP发生的风险将在更多地区显著增加,在SSP5-8.5情景下,在~ 2083年后,约8%的NH地区每年都会发生EDVP。我们的研究结果强调了积雪减少对EDVP的调节作用,并为更好地预测和减轻积雪变化的生态后果提供了见解。
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引用次数: 0
Satellite derived product benchmarking and empirical model development for estimating photosynthetically active radiation at high latitudes 估算高纬度地区光合有效辐射的卫星衍生产品基准和经验模型开发
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2026-01-10 DOI: 10.1016/j.agrformet.2025.111014
Sebastian Zainali , Silvia Ma Lu , Tomas Landelius , Pietro Elia Campana
Photosynthetically Active Radiation (PAR) is a critical parameter for understanding plant growth and optimising agricultural productivity. Accurate estimation and measurement of PAR are essential for various applications, including the design of agrivoltaic systems, which enable dual use of land for solar energy conversion and crop cultivation. Despite its importance, routine measurements of PAR remain scarce globally, creating a significant gap in comprehensive tracking. This study addresses this gap by comparing PAR estimates derived from satellite sources such as CERES and SARAH-3 and the mesoscale model STRÅNG with weather station measurements. In addition, a multiple linear regression model was developed and calibrated for Sweden using data from the Integrated Carbon Observation System network. Seasonal and hourly variations in the PAR to Global Horizontal Irradiance (GHI) ratio were also analysed to understand their dynamic changes over time. The findings indicate that linear models using GHI as the primary predictor for PAR demonstrated high accuracy, with normalised Mean Absolute Error below 8% at all stations, with values such as 4% at Degerö and 3.2% at Norunda. Seasonal variability in the PAR to GHI ratio was observed, particularly during winter months at higher latitudes, where the ratio fluctuated between 0.39 and 0.42 at Degerö. In contrast, the summer period showed minimal variation, with the PAR/GHI ratio remaining stable across locations. Moreover, the spatial regression model, which combined data from different stations, successfully predicted PAR at new sites such as Norunda, achieving an R² of 0.98 to 0.99. Model residuals were within the typical uncertainty of PAR sensors (±5%), confirming remaining deviations are dominated by measurement error rather than modelling uncertainty. This demonstrates the model’s applicability across Sweden, providing a robust and versatile tool for estimating PAR in areas lacking measurements. The linear model reduces the need for extensive PAR measurement campaigns.
光合有效辐射(PAR)是了解植物生长和优化农业生产力的关键参数。PAR的准确估计和测量对于各种应用至关重要,包括农业光伏系统的设计,它可以将土地用于太阳能转换和作物种植。尽管PAR很重要,但全球对PAR的常规测量仍然很少,在全面跟踪方面造成了重大差距。本研究通过比较来自CERES和SARAH-3等卫星来源以及中尺度模式STRÅNG的PAR估计值与气象站测量值来解决这一差距。此外,利用综合碳观测系统网络的数据,开发并校准了瑞典的多元线性回归模型。还分析了PAR与全球水平辐照度(GHI)比值的季节和小时变化,以了解它们随时间的动态变化。研究结果表明,使用GHI作为PAR的主要预测因子的线性模型具有很高的准确性,所有站点的归一化平均绝对误差低于8%,例如Degerö的值为4%,Norunda的值为3.2%。观测到PAR与GHI比值的季节变化,特别是在高纬度地区的冬季月份,该比值在Degerö处在0.39至0.42之间波动。相比之下,夏季变化最小,PAR/GHI比值在各地点保持稳定。此外,结合不同站点数据的空间回归模型成功地预测了Norunda等新站点的PAR, R²为0.98 ~ 0.99。模型残差在PAR传感器的典型不确定度(±5%)内,证实剩余偏差主要是由测量误差而不是建模不确定度决定的。这证明了该模型在整个瑞典的适用性,为缺乏测量的地区估计PAR提供了一个强大而通用的工具。线性模型减少了广泛的PAR测量活动的需要。
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引用次数: 0
Corrigendum to “Global optimization of a water-constrained two-leaf light use efficiency model through multi-biome FLUXNET observations” [Agricultural and Forest Meteorology 375 (2025) 1–18/110845] “基于多生物群群FLUXNET观测的水约束双叶光利用效率模型的全局优化”[农林气象375(2025)1-18/110845]的勘误表
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2026-01-01 DOI: 10.1016/j.agrformet.2025.110997
Sha Zhang , Wenchao Wang , Jinguo Yuan , Yun Bai
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引用次数: 0
Delineating hierarchical agro-ecological zones for crop production environments in Kansas 划定了堪萨斯州农作物生产环境的等级农业生态区
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2026-01-03 DOI: 10.1016/j.agrformet.2025.110999
Sarah Sexton-Bowser, Kraig Roozeboom, Andres Patrignani
Agro-ecological zones (AZs), defined as areas with relatively homogeneous climate and soil conditions, are important for agricultural management and planning, yet previous studies have often relied on single-step clustering, excluded edaphic attributes, or lacked validation with independent datasets. The objectives of this study were to: 1) delineate hierarchical AZs for Kansas using climate and edaphic variables, and 2) validate AZs using external datasets of environmental causes of crop yield loss and land cover. AZs were delineated using the k-means clustering with macro-AZs derived from long-term climatic features and nested micro-AZs based on soil physical attributes. Climate features included annual precipitation, annual reference evapotranspiration, and mean annual temperature. Soil physical attributes included plant available water capacity, soil organic matter, and effective soil depth. The validation consisted of a multinomial regression model with datasets of environmental causes of crop yield loss and land cover, which reflect the influence of climate and soils on crop performance. The analysis resulted in three macro-AZs partitioning the state into northwest, southwest, and east regions, each with two nested micro-AZs based on soil attributes. The multinomial model resulted in a validation accuracy of 88% for the macro-AZs and 67% for nested micro-AZs. Our study provides a scalable framework for hierarchical AZs that capture spatial variability in climate and soil conditions and can support regional agricultural planning, guide the design of area crop performance trials, facilitate scaling of point-level crop model simulations to broader regions, and inform the placement of future environmental monitoring stations.
农业生态区(AZs)被定义为气候和土壤条件相对均匀的地区,对农业管理和规划至关重要,但以往的研究往往依赖于单步聚类,排除了土壤属性,或者缺乏独立数据集的验证。本研究的目的是:1)利用气候和地理变量划定堪萨斯州的分层AZs; 2)利用作物产量损失和土地覆盖的环境原因的外部数据集验证AZs。采用k-means聚类方法,根据长期气候特征划分宏观az,根据土壤物理属性划分嵌套微观az。气候特征包括年降水量、年参考蒸散量和年平均气温。土壤物理属性包括植物有效水分、土壤有机质和土壤有效深度。该验证包括一个多项式回归模型,该模型包含作物产量损失和土地覆盖的环境原因数据集,反映了气候和土壤对作物生产性能的影响。分析结果表明,三个宏观az将该州划分为西北、西南和东部区域,每个区域根据土壤属性嵌套两个微观az。多项模型对宏观azs的验证精度为88%,对嵌套的微观azs的验证精度为67%。我们的研究为分层AZs提供了一个可扩展的框架,该框架可以捕获气候和土壤条件的空间变异性,可以支持区域农业规划,指导区域作物性能试验的设计,促进点水平作物模型模拟的扩展到更广泛的区域,并为未来环境监测站的放置提供信息。
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引用次数: 0
Synergistic importance of memory and spatial neighbourhood effects in modelling net ecosystem productivity 记忆和空间邻域效应在模拟净生态系统生产力中的协同重要性
IF 5.7 1区 农林科学 Q1 AGRONOMY Pub Date : 2026-03-01 Epub Date: 2025-12-12 DOI: 10.1016/j.agrformet.2025.110985
Jian Liu , Tao Zhou , Jingyu Zeng , Jingzhou Zhang , Xuemei Wu , Yajie Zhang , Qi Zhang , Yancheng Qu , Peixia Liu , Wenjuan Zhang , E Tan , Ying Yu , Li Cao
Net ecosystem productivity (NEP) is a key indicator of terrestrial carbon balance, and elucidating its spatiotemporal patterns is essential for understanding global carbon cycle processes and response mechanisms under climate change. However, substantial uncertainty persists owing to lag, legacy, and spatial neighbourhood effects, necessitating the joint consideration of memory and neighbourhood information for accurate NEP simulation. We developed a convolutional long short-term memory (ConvLSTM) deep-learning model using global flux observations, multisource remote sensing, and environmental driver data to capture spatiotemporal dependencies in simulating global terrestrial NEP and quantitatively compared it with models that consider only memory (LSTM), only neighbourhoods (CNN), or neither (ANN) to assess the synergistic importance of memory and neighbourhood effects in NEP simulations. The results demonstrated that (1) ConvLSTM performed best (mean site-level validation R2 = 0.72; RMSE = 0.86 g C m-2 d-1), with closer agreement to observations in long-term trends and interannual variation. LSTM (R2 = 0.66; RMSE = 0.94 g C m-2 d-1) and CNN (R2 = 0.67; RMSE = 0.93 g C m-2 d-1) results were intermediate, and the ANN was the worst (R2 = 0.56; RMSE = 1.06 g C m-2 d-1). (2) The results from ConvLSTM indicate that global terrestrial NEP increased from 2001 to 2023 (0.052 Pg C yr-2), with marked regional differences: parts of the Amazon and Congo showed declining sink capacity, whereas eastern China and India strengthened. Ignoring both memory and neighbourhood effects overestimated sink strength and growth in highly productive regions, and memory effects dominated neighbourhood effects in shaping NEP spatial patterns. (3) Jointly modelling memory and neighbourhood information also improved the detection of drought legacy effects and NEP responses to ENSO events.
净生态系统生产力(NEP)是陆地碳平衡的重要指标,阐明其时空格局对理解气候变化下全球碳循环过程及其响应机制具有重要意义。然而,由于滞后、遗留和空间邻域效应,大量的不确定性仍然存在,因此需要联合考虑记忆和邻域信息来进行准确的NEP模拟。我们开发了一个卷积长短期记忆(ConvLSTM)深度学习模型,利用全球通量观测、多源遥感和环境驱动数据来捕捉模拟全球陆地NEP的时空依赖性,并将其与仅考虑记忆(LSTM)、仅考虑邻域(CNN)或两者都不考虑(ANN)的模型进行定量比较,以评估记忆和邻域效应在NEP模拟中的协同重要性。结果表明:(1)ConvLSTM表现最佳(平均站点水平验证R2 = 0.72; RMSE = 0.86 g C m-2 d-1),与长期趋势和年际变化的观测结果更为吻合。LSTM (R2 = 0.66, RMSE = 0.94 g C m-2 d-1)和CNN (R2 = 0.67, RMSE = 0.93 g C m-2 d-1)结果为中等,ANN最差(R2 = 0.56, RMSE = 1.06 g C m-2 d-1)。(2) ConvLSTM结果表明,2001 - 2023年全球陆地NEP增加(0.052 Pg C -2),且区域差异显著:亚马逊河流域和刚果(金)部分地区的汇容量下降,而中国东部和印度的汇容量增强。在忽略记忆效应和邻域效应的情况下,高估了高产地区的汇强度和增长,记忆效应在形成新经济政策空间格局方面主导了邻域效应。(3)记忆和邻域信息的联合建模提高了干旱遗留效应的检测和NEP对ENSO事件的响应。
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Agricultural and Forest Meteorology
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