Rangeland Ecology & Management最新文献_第7页

Tallgrass Prairie Responses to Weather Variability and Management: Analyses of Vegetation Dynamics and Water Use 高草草原对气候变化和管理的响应：植被动态和水分利用分析

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-09-17 DOI: 10.1016/j.rama.2025.08.003

Pradeep Wagle , Tanka Kandel , Brian K. Northup , Xiangming Xiao , Corey Moffet , Stephen Teet , Sherry Hunt , Stacey A. Gunter

The tallgrass prairie of the Great Plains is an ecologically and economically important grassland ecosystem in the United States. Prairies face significant challenges from weather variability (such as changing precipitation patterns, increased droughts, and heat waves) and management-related disturbances (such as prescribed burns, hay production, and grazing). This study examines the responses of tallgrass prairie to weather variability and management practices using data from the long-term, multi-factor “integrated Grassland-Livestock and Burning Experiment (iGLOBE)” in central Oklahoma. The experiment includes a cluster of eddy covariance (EC) systems across five native tallgrass prairies managed with different grazing, hay production, and burning regimes. The major objectives were to 1) quantify the variations in EC-measured evapotranspiration (ET) at different temporal scales across differently managed prairies under varying environmental conditions, and 2) combine remotely sensed vegetation indices with ET to assess their potential for monitoring and examining ecosystem responses to variable weather and management. Interannual variations in precipitation patterns during the study period (2019–2024) influenced vegetation dynamics, forage production, and ET. Temperature variability also played a crucial role in modifying the impact of precipitation, particularly during the early and late growing seasons. The observed ranges of maximum daily, growing season (April-October), and annual ET were 4.9–8.64 mm d^-1, 468–716 mm, and 546–861 mm, respectively, across pastures. Annual ET: precipitation ratios ranged from 0.67 in wet years to 1.15 in dry years. This study provides a ground-truth ET dataset across different weather and management scenarios, enabling validation of ET estimates from models and satellite-derived products for tallgrass prairies, even where direct ET measurements are unavailable. A strong agreement (R² ≥ 0.70) between satellite-derived enhanced vegetation index (EVI) and EC-measured ET demonstrated the potential to combine these datasets for more precise quantification of how weather and management affect productivity and water use across native prairie landscapes.

大平原的高草草原是美国生态和经济上重要的草原生态系统。草原面临着来自天气变化（如降水模式的变化、干旱和热浪的增加）和管理相关干扰（如规定的焚烧、干草生产和放牧）的重大挑战。本研究利用俄克拉何马州中部长期、多因素的“草地-牲畜和燃烧综合实验（iGLOBE）”数据，考察了高草草原对天气变化和管理实践的反应。该实验包括一组涡流相关（EC）系统，分布在五个本地高草草原上，采用不同的放牧、干草生产和燃烧制度进行管理。研究的主要目标是：1)量化在不同环境条件下，不同管理方式的草原上不同时间尺度上ec测量的蒸散发（ET）的变化；2)将遥感植被指数与ET结合起来，评估其监测和研究生态系统对不同天气和管理的响应的潜力。研究期间（2019-2024年）降水模式的年际变化影响了植被动态、牧草生产和ET。温度变率在调节降水影响方面也发挥了关键作用，尤其是在生长季的早期和晚期。各牧场最大日蒸散量、生长期（4 ~ 10月）蒸散量和年蒸散量分别为4.9 ~ 8.64 mm d-1、468 ~ 716 mm和546 ~ 861 mm。年ET：降水比值在湿润年为0.67 ~干旱年为1.15。本研究提供了不同天气和管理情景下的真实ET数据集，即使在无法获得直接ET测量的情况下，也可以通过模型和卫星衍生产品对高草草原的ET估计进行验证。卫星衍生的增强型植被指数（EVI）与ec测量的ET之间具有很强的一致性（R2≥0.70），表明可以将这些数据集结合起来，更精确地量化天气和管理如何影响原生草原景观的生产力和水资源利用。

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引用次数: 0

Uninsured Pastoralists - Adoption and Attitudes towards Index-Based Livestock Insurance in Four Kenyan Counties 没有保险的牧民——肯尼亚四个县对基于指数的牲畜保险的采用和态度

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-09-17 DOI: 10.1016/j.rama.2025.08.005

Göran Bostedt , Per Knutsson , Deborah Muricho , Stephen Mureithi , Ewa Wredle

Index-based livestock insurance (IBLI) is promoted as a proactive measure to protect against climate-related risks. Despite initial efforts to introduce the insurance, its adoption has generally been low in most developing countries. This paper compares adopters and nonadopters of IBLI in four arid or semi-arid counties in Kenya, focusing specifically on household demographics, climate effects, land tenure arrangements, and the interaction between other coping strategies and the decision to adopt livestock insurance. The household survey was conducted in 12 counties, whereby 491 respondents were interviewed, of which about 4.5% had insurance. The results showed that IBLI adoption was influenced by the socioeconomic, environmental, and existing adoption strategies. Lack of awareness was the most common reason (44.2% of respondents) for not adopting insurance, showing the need for simplifying information, because the respondents with more schooling were likely to purchase insurance. High precipitation reduced the need for livestock insurance due to low drought risk. Active fodder management positively influenced insurance uptake, likely due to the use of the indemnity for investment in other adaptive strategies. Otherwise, pastoralists were more likely to purchase insurance if they had to travel a long distance to the alternative grazing grounds. Likewise, insurance premiums limited insurance uptake due to the imperfect correlation between drought and indemnity payments (basis risk). Generally, insurance alone is not a panacea for pastoralists. Presently, they seem to be too expensive compared to the value they provide. Either the prediction accuracy of IBLIs must be increased, or premiums more heavily subsidized, for insurance to be a genuine alternative for pastoralists.

基于指数的牲畜保险（IBLI）作为防范气候相关风险的一项积极措施得到推广。尽管最初努力引入这种保险，但在大多数发展中国家，它的采用率普遍较低。本文比较了肯尼亚四个干旱或半干旱县采用IBLI和未采用IBLI的情况，特别关注家庭人口统计、气候影响、土地权属安排以及其他应对策略与采用牲畜保险决策之间的相互作用。住户调查在12个县进行，共采访了491名受访者，其中约4.5%的人有保险。结果表明，社会经济、环境和现有的采用策略对IBLI的采用有影响。缺乏意识是不投保的最常见原因（44.2%的受访者），表明需要简化信息，因为受教育程度较高的受访者更有可能购买保险。由于干旱风险低，高降水减少了对牲畜保险的需求。积极饲料管理积极影响保险吸收，可能是由于使用补偿投资于其他适应性策略。否则，如果牧民不得不长途跋涉到另一个牧场，他们更有可能购买保险。同样，由于干旱和赔款（基本风险）之间的不完全相关性，保险费限制了保险的吸收。一般来说，保险本身并不是牧民的灵丹妙药。目前，与它们提供的价值相比，它们似乎太贵了。要么必须提高ibli的预测准确性，要么必须加大对保费的补贴，这样保险才能真正成为牧民的选择。

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引用次数: 0

Efficacy of Four Non-destructive Methods for Estimating Aboveground Biomass in Subtropical Grasslands 四种非破坏性方法估算亚热带草原地上生物量的有效性

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-09-17 DOI: 10.1016/j.rama.2025.08.008

Akiem M. Gough, Kathryn G. Smith, Grégory Sonnier, Karen E. Rice, Emily Anderson, Fern Barker, Tyler Bernard, Emmy Stewart, Jacqueline Valiente, Elizabeth H. Boughton

Reliably measuring aboveground vegetative biomass is essential for managing grazing lands and protecting the ecosystem services these lands provide. Destructive methods of measuring aboveground biomass (clipping and weighing biomass) are time-consuming and labor-intensive. We evaluated the efficacy of four non-destructive methods for estimating aboveground biomass: visual obstruction (VO¹) measured with a Robel pole, vegetation height with a meter stick, a 1.6 kg weighted plate, and a 3.7 kg weighted plate.

This study was conducted at Archbold Biological Station’s Buck Island Ranch, a working cattle ranch in south-central Florida. Ninety plots were measured within ten 16-ha pastures for each month of the five-month study: eight cultivated improved pastures (IMP²) and two semi-native pastures (SNP³). We hypothesized that (1) VO measured with a Robel pole would provide the most reliable measurements while the meter stick would provide the least reliable measurements and (2) non-destructive methods would have a higher correlation to clipped biomass in more homogenous IMP. Linear regressions were used to determine if correlations existed between observed biomass weights and vegetation height from each of the non-destructive sampling methods. All methods showed a positive relationship with biomass, but in both IMP and SNP, the 3.7 kg weighted plate had the strongest correlation with biomass (R² = 0.72, 0.62, respectively) and the meter stick had the least (R² = 0.54, 0.23, respectively).

However, different methods were found to be more effective at estimating biomass when dominant species were modeled individually. This study demonstrated that there are reliable, less time-consuming, and labor-intensive alternatives to destructive methods of biomass estimation. Less intensive measurements may allow land managers to make more efficient grazing decisions or simplify calibrating remote sensing products that will allow biomass estimates to be taken at scales relevant to management.

可靠地测量地上植物生物量对于放牧地的管理和保护这些土地提供的生态系统服务至关重要。测量地上生物量的破坏性方法（剪切和称重生物量）既耗时又费力。我们评估了四种估算地上生物量的非破坏性方法的有效性：用罗贝尔杆测量视觉阻塞（VO1），用米尺测量植被高度，用1.6 kg称重板和3.7 kg称重板。这项研究是在阿奇博尔德生物站的巴克岛牧场进行的，这是佛罗里达州中南部的一个工作牧场。在为期5个月的研究中，每个月在10个16公顷的牧场内测量90个样地，其中8个改良牧场（IMP2）和2个半原生牧场（SNP3）。我们假设(1)用罗贝尔杆测量的VO是最可靠的测量值，而米尺测量的VO是最不可靠的测量值；(2)在更均匀的IMP中，非破坏性采样方法与剪切生物量的相关性更高。我们使用线性回归来确定每种非破坏性采样方法观察到的生物量重量与植被高度之间是否存在相关性。所有方法均与生物量呈正相关，但在IMP和SNP中，3.7 kg加权板与生物量的相关性最强（R2分别为 = 0.72、0.62），米尺与生物量的相关性最小（R2分别为 = 0.54、0.23）。然而，当优势种单独建模时，发现不同的方法在估算生物量方面更有效。这项研究表明，有可靠的，更少的时间和劳动密集型替代破坏性的生物量估算方法。不那么密集的测量可能使土地管理者能够作出更有效的放牧决定，或简化遥感产品的校准，从而能够在与管理有关的尺度上进行生物量估算。

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引用次数: 0

Erratum to “Pollination Needs and Diverse Bees of a Prospective Fuelbreak Wildflower, Curlycup Gumweed (Grindelia squarrosa) (Asteraceae)” [Rangeland Ecology & Management volume 102, September 2025, pages 186-192] “一种未来的燃料中断野花的授粉需求和多样化的蜜蜂，卷叶菊（Grindelia squarrosa）（Asteraceae）”的勘误[牧场生态与管理第102卷，2025年9月，186-192页]

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-09-13 DOI: 10.1016/j.rama.2025.08.004

James H. Cane , Byron G. Love , Skyler Burrows , Alexander Fortin , Kelsey K. Graham

引用次数: 0

Remote Sensing of Drought Impacts to Support Resilient Land Use and Urban Fringe Planning and Power Supply System 干旱影响遥感支持弹性土地利用和城市边缘规划及供电系统

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-09-04 DOI: 10.1016/j.rama.2025.08.002

Siqi Zhang , WenYang Xu , Iram Naz , Xiangtian Zheng , Mohammad Suhail Meer , Habib Kraiem , Rana Muhammad Zulqarnain , Qaiser Abbas

Drought poses a critical threat to rangeland ecosystems, land use sustainability, and the resilience of infrastructure systems, including energy networks near urban fringes. This study applies a multi-index remote sensing approach to evaluate the spatial and temporal impacts of drought on rangelands by comparing nondrought (2023) and drought (2024) conditions. Satellite-derived indices such as Vegetation Health Index (VHI), Vegetation Condition Index (VCI), Normalized Difference Vegetation Index (NDVI), Soil Moisture Index (SMI), Normalized Difference Water Index (NDWI), Temperature Condition Index (TCI), Land Surface Temperature (LST), Standardized Precipitation Index (SPI), Evaporative Stress Index (ESI), Palmer Drought Severity Index (PDSI), and Drought Severity Index (DSI) were integrated to characterize drought manifestations. Principal Component Analysis identified three core drought dimensions: vegetation response, thermal stress, and soil moisture dynamics, explaining 78% of the total variance. Notably, VCI, NDWI, and TCI emerged as the most sensitive indicators of drought stress. Western regions rangelands experienced the highest severity, while eastern regions showed greater ecological resilience. Land cover analysis revealed a 1.2% increase in rangeland area during drought, largely due to the conversion of shrublands, indicating a potential shift in vegetation regimes. These findings inform not only ecological management but also urban fringe planning, where land-use shifts under drought may affect infrastructure vulnerability and power system reliability. By offering a comprehensive, spatially explicit drought assessment framework, this study supports integrated land-use planning and enhances the adaptive capacity of socio-ecological and energy systems in semi-arid urbanizing regions. The results enhance our understanding of how rangeland ecosystems respond to drought and offer a methodological framework for assessing drought impacts in comparable semi-arid regions worldwide.

干旱对牧场生态系统、土地利用的可持续性和基础设施系统（包括城市边缘附近的能源网络）的复原力构成严重威胁。本研究采用多指数遥感方法，通过对比非干旱（2023年）和干旱（2024年）条件，评价干旱对草地的时空影响。利用植被健康指数（VHI）、植被状况指数（VCI）、归一化植被指数（NDVI）、土壤湿度指数（SMI）、归一化水分指数（NDWI）、温度状况指数（TCI）、地表温度（LST）、标准化降水指数（SPI）、蒸发胁迫指数（ESI）、帕尔默干旱严重指数（PDSI）和干旱严重指数（DSI）等卫星衍生指数来描述干旱的特征。主成分分析确定了三个核心干旱维度：植被响应、热应力和土壤水分动态，解释了总方差的78%。值得注意的是，VCI、NDWI和TCI是干旱胁迫最敏感的指标。西部放牧区生态恢复能力最强，东部放牧区生态恢复能力最强。土地覆盖分析显示，干旱期间牧场面积增加1.2%，这主要是由于灌木地的转变，表明植被制度可能发生变化。这些发现不仅为生态管理提供了信息，也为城市边缘规划提供了信息，在城市边缘规划中，干旱下土地利用的变化可能会影响基础设施的脆弱性和电力系统的可靠性。本研究通过提供一个全面、空间明确的干旱评价框架，支持半干旱城市化地区土地利用综合规划，增强社会生态系统和能源系统的适应能力。这些结果增强了我们对牧场生态系统如何响应干旱的理解，并为评估全球类似半干旱地区的干旱影响提供了一个方法学框架。

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引用次数: 0

Adapting to Climatic Extremes: Do Grazing Management Strategies Matter? 适应极端气候：放牧管理策略重要吗？

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-09-02 DOI: 10.1016/j.rama.2025.07.016

Merilynn C. Schantz , Douglas R. Smith , Kabindra Adhikari , Douglas J. Goodwin , Douglas R. Tolleson , Javier M. Osorio Leyton , Kelly R. Thorp , R. Daren Harmel

Frequent and extreme weather events have increased the need for improved grazing land management strategies that can withstand these disturbances. Alternative grazing strategies of rotational and supplemental forage cover crop use have been suggested as producing greater environmental benefits than prevailing practices of continuous use with supplemental forage oat grazing in pasturelands. How plant and animal performance differs by these grazing strategies, especially during climactic extremes, however, is unknown as it requires long-term studies that occur across common land management (large) spatial scales. Dynamic precipitation patterns in central Texas provide a unique environment to test the differences in grazing management strategies by weather inputs. For this study, we sought to compare plant production and animal nutrition between alternative adaptive grazing land management strategies of rotationally grazed pastures and forage cover crops to prevailing methods of continuously grazed pastures and supplemental forage oats across a 10-yr period in central Texas. Our results suggest that alternative strategies of rotational grazing with supplemental cover crops resulted in greater plant production, especially in ungrazed regions during drought, compared to prevailing practices of continuous pasture grazing with supplemental forage oats. Animal nutrition was, alternatively, inconclusive as fecal crude protein in cattle was greater when animals grazed the prevailing treatment of forage oats and continuously grazed pastures, although the ratio of digestible organic matter to crude protein was greater when cattle grazed the alternative treatment of rotational and cover crop pastures. Collectively, these results suggest that alternative grazing strategies may be more resistant to climatic extremes.

频繁和极端的天气事件增加了改进牧场管理战略以抵御这些干扰的需求。轮牧和补充牧草覆盖作物的替代放牧策略被认为比在草地上连续使用补充牧草的做法产生更大的环境效益。然而，由于需要在共同土地管理（大）空间尺度上进行长期研究，因此尚不清楚这些放牧策略如何影响植物和动物的生产性能，特别是在极端气候条件下。德克萨斯州中部的动态降水模式提供了一个独特的环境，可以根据天气输入来测试放牧管理策略的差异。在这项研究中，我们试图在德克萨斯州中部10年的时间里，比较轮牧和牧草覆盖作物的替代适应性放牧土地管理策略与连续放牧和补充牧草燕麦的流行方法之间的植物生产和动物营养。我们的研究结果表明，与持续放牧和补充牧草燕麦相比，轮牧和补充覆盖作物的替代策略可以提高植物产量，特别是在干旱期间的未放牧地区。另一方面，动物营养也不确定，因为当动物放牧牧草燕麦和连续放牧时，牛的粪便粗蛋白质含量更高，尽管当牛放牧轮作和覆盖作物交替处理时，可消化有机质与粗蛋白质的比例更高。总的来说，这些结果表明，替代放牧策略可能更能抵御极端气候。

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引用次数: 0

Mule Deer Response to Invasive Annual Grasses: Implications for Strategic Management in Sagebrush Priority Areas 骡鹿对一年生草入侵的响应：对山艾树优先区战略管理的启示

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-09-02 DOI: 10.1016/j.rama.2025.07.012

Kurt T. Smith , Brian A. Mealor , Jerod A. Merkle

Invasive annual grasses (IAG) are a widespread threat to the sagebrush steppe (Artemisia spp. L) rangelands and associated wildlife of the western United States. Multiple ungulate species including mule deer (Odocoileus hemionus Rafinesque) rely on sagebrush steppe seasonally. While substantial efforts have been made to conserve critical mule deer habitat, less attention has been given to mule deer habitat affected by IAGs and there is limited information about how mule deer respond to IAG invasions. We evaluated mule deer resource selection in a sagebrush grassland community impacted by IAGs in northeast Wyoming. We then used empirical model estimates to forecast how IAG management could impact mule deer habitat in the future following a strategic IAG framework focused on defending and growing sagebrush core areas most threatened by IAGs. We found that mule deer responded to IAGs in a nonlinear pattern across all seasons and strongly avoided areas once cover exceeded approximately 20%. When projecting results 20 yr into the future, we found that over half of the study area is expected to experience significant declines in mule deer habitat quality if IAGs continue to spread at the same rate observed over the past two decades. However, with targeted IAG treatments, we predicted widespread improvements in mule deer habitat, particularly in priority areas where ecological integrity can be restored with future IAG management. Our findings reinforce the emerging notion that ecosystem-based frameworks designed to defend and grow intact sagebrush steppe through strategic management efforts also have the potential to benefit species of conservation interest. As current conservation efforts to mitigate IAGs are not progressing fast enough to address the magnitude of the IAG problem in sagebrush across the west, strategic management efforts will be necessary to maintain important habitats for numerous sagebrush occurring wildlife.

入侵的一年生草（IAG）是美国西部艾草草原（Artemisia spp. L）牧场和相关野生动物的广泛威胁。包括骡鹿（Odocoileus hemionus Rafinesque）在内的多种有蹄类动物季节性地依赖于山艾草草原。尽管人们为保护重要的骡鹿栖息地做出了大量努力，但对IAG对骡鹿栖息地的影响关注较少，关于骡鹿如何应对IAG入侵的信息有限。以怀俄明东北部受iag影响的山艾草群落为研究对象，对该群落的骡鹿资源选择进行了评价。然后，我们使用经验模型估计，预测IAG管理在未来如何影响骡鹿栖息地，并遵循IAG战略框架，重点是保护和种植受IAG威胁最严重的山艾树核心地区。我们发现，在所有季节，骡鹿对iag的反应都是非线性的，一旦覆盖面积超过20%，它们就会强烈避开。在预测未来20年的结果时，我们发现，如果iag继续以过去20年观察到的相同速度传播，预计超过一半的研究区域将经历骡鹿栖息地质量的显着下降。然而，通过有针对性的IAG处理，我们预测骡鹿栖息地的广泛改善，特别是在未来IAG管理可以恢复生态完整性的重点地区。我们的研究结果加强了一个新兴的概念，即通过战略管理工作来保护和生长完整的山艾草草原的基于生态系统的框架也有可能使保护感兴趣的物种受益。由于目前减少IAG的保护工作进展不够快，不足以解决整个西部山艾树IAG问题的严重性，因此有必要采取战略管理措施，以维护大量山艾树野生动物的重要栖息地。

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引用次数: 0

Remote Sensing of Forage Droughts in the Dry Chaco (Argentina) 阿根廷查科干旱区牧草干旱遥感研究

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-08-30 DOI: 10.1016/j.rama.2025.07.014

Lisandro Blanco , Walter Agüero , Alicia Sancho , Marcos Texeira

Background

Drought is widely recognized as one of the most complex natural hazards due to its gradual onset and long-lasting impacts. With climate change, droughts are becoming increasingly intense, frequent, and prolonged, particularly in arid and semiarid rangelands, posing a serious threat to the sustainability of livestock systems. The objective of this study was to develop, calibrate, and validate a methodology for detecting forage droughts and monitoring their spatial and temporal patterns using satellite-derived anomalies in the Normalized Difference Vegetation Index (NDVI), hereafter NDVI anomalie (NDVIA).

Methods

Forage droughts are defined as temporary reductions in forage productivity in rangelands, grasslands, and pastures caused by rainfall falling below the long-term average. These reductions are so severe that even with adaptive forage management, the forage biomass accumulated during the growing season is insufficient to sustain livestock during the vegetative rest period (forage drought model). The study focuses on the dry Chaco region of Argentina. NDVIA values were correlated with forage biomass data collected in the field at 20 sites over a 10-yr period. Using a logistic regression model, the NDVIA threshold indicating the presence or absence of forage drought was determined.

Results

Results revealed a significant relationship (P < 0.05) between NDVIA and forage drought presence/absence. During the study period (2001–2023), forage droughts in the region typically recurred every 5 ± 2 growing seasons. A cluster analysis identified two subzones with significant differences (P < 0.05) in the temporal dynamics of forage drought occurrence.

Implications

The combined application of the forage drought model and this NDVI-based monitoring system could serve as a “guidebook” for implementing forage management strategies at the farm scale (e.g., adaptive forage management) and shaping public policies at the regional scale (e.g., satellite index-based insurance). This methodological approach, first-of-its-kind in region, could be adapted to other arid and semiarid ecosystems globally, enhancing the early warning and management of forage droughts.

干旱是公认的最复杂的自然灾害之一，因其发生缓慢且影响持久。随着气候变化，干旱变得越来越严重、频繁和持续时间越来越长，特别是在干旱和半干旱的牧场，对畜牧业系统的可持续性构成严重威胁。本研究的目的是开发、校准和验证一种方法，该方法可以利用归一化植被指数（NDVI）（以下简称NDVI异常（NDVIA））的卫星衍生异常来检测牧草干旱并监测其时空模式。方法草料干旱被定义为由于降雨量低于长期平均水平而导致的牧场、草原和牧场草料生产力的暂时下降。这些减少是如此严重，以至于即使采用适应性饲料管理，在生长季节积累的饲料生物量也不足以在营养休息期间维持牲畜（饲料干旱模型）。这项研究的重点是阿根廷干旱的查科地区。NDVIA值与在20个地点收集的10年牧草生物量数据相关。利用logistic回归模型，确定了牧草干旱存在与否的NDVIA阈值。结果NDVIA与牧草干旱存在与否呈显著相关（P <； 0.05）。研究期间（2001-2023年），该地区草料干旱每5个 ± 2个生长季发生一次。聚类分析发现两个亚区在牧草干旱发生的时间动态上存在显著差异（P <； 0.05）。牧草干旱模型与基于ndvi的监测系统的结合应用可以作为在农场规模上实施牧草管理策略（如适应性牧草管理）和在区域规模上制定公共政策（如基于卫星指数的保险）的“指南”。该方法在区域内首创，可适用于全球其他干旱和半干旱生态系统，加强牧草干旱的预警和管理。

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引用次数: 0

Compost and Native Seeding Interactively Increase Bulk Soil Carbon, but Compost Addition Favors Nonnative Plants 堆肥和本地种子相互作用增加土壤碳量，但堆肥添加有利于非本地植物

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-08-30 DOI: 10.1016/j.rama.2025.07.010

Justin C. Luong , Jazmine Mejia-Muñoz , Pam Krone

Rangelands are globally distributed habitats with high potential for supporting nature-based climate solutions. Yet, rangelands will be affected by human disturbances that result in severe habitat degradation and may need intervention to sufficiently recover. Compost addition can help improve soil carbon and water holding capacity, whereas native seeding can help bolster plant cover and richness; synergistically, they could have cascading effects on plant communities and forage quality. To better understand the utility of combining these range improvements, we treated a degraded working grassland (used to stage wildfire-fighting operations) in coastal California with compost broadcasting (1.48 kg · m⁻²) and native seeding (eight California species) treatments annually for 3 consecutive yr (2020–2022). We evaluated plant community composition, forage quality and toxicity, and soil biogeochemistry (soil inorganic carbon [SIC] and soil organic carbon [SOC] concentrations [%] and bulk soil carbon [T C · ha⁻¹]). Compost addition resulted in higher concentrations of soil organic matter (SOM) but did not increase SOC and SIC. Nonnative plant cover increased over time only in compost addition plots. Native cover and richness were unaffected by native seeding, but native cover was lower with compost addition. Compost resulted in higher relative cover of low-quality and less toxic forage, but also lower relative cover of high-quality forage. Bulk soil carbon was unaffected by independent compost addition or native seeding but increased significantly when treatments were combined. Our results demonstrate that compost application and native seeding have the potential to support soil recovery of SOM and bulk soil carbon in a degraded rangeland. The findings also suggest there are trade-offs in these practices, as compost addition could promote nonnative species and higher relative plant cover of low-quality forage. Low success from native seeding indicates that recommended seeding rates may be insufficient to establish plants in a degraded rangeland with compacted soils.

牧场是全球分布的栖息地，具有支持基于自然的气候解决方案的巨大潜力。然而，牧场将受到人类干扰的影响，导致生境严重退化，可能需要干预才能充分恢复。添加堆肥可以帮助提高土壤的碳和水保持能力，而本地播种可以帮助增加植物覆盖和丰富度；在协同作用下，它们可能对植物群落和饲料质量产生级联效应。为了更好地了解结合这些范围改进的效用，我们连续3年（2020-2022），每年使用堆肥广播（1.48 kg·m - 2）和本地播种（8种加州物种）处理加利福尼亚沿海退化的工作草地（用于进行野火灭火行动）。我们评估了植物群落组成、牧草质量和毒性以及土壤生物地球化学（土壤无机碳[SIC]和土壤有机碳[SOC]浓度[%]和土壤总碳[T C·ha−1]）。堆肥增加了土壤有机质（SOM）浓度，但没有增加土壤有机碳（SOC）和SIC。随着时间的推移，只有在添加堆肥的地块上，非本土植物的覆盖面积才会增加。原生盖度和丰富度不受原生播种的影响，但堆肥的添加降低了原生盖度。堆肥提高了低质低毒牧草的相对覆盖度，降低了优质牧草的相对覆盖度。土壤碳量不受单独添加堆肥和本地播种的影响，但在组合处理时显著增加。我们的研究结果表明，在退化的草地上，施用堆肥和本地播种具有支持土壤SOM和大量土壤碳恢复的潜力。研究结果还表明，在这些做法中存在权衡，因为堆肥添加可以促进非本地物种和提高低质量饲料的相对植物覆盖率。原生播种的低成功率表明，推荐的播种率可能不足以在土壤压实的退化牧场上种植植物。

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引用次数: 0

Northern Bobwhite Response to Drought is Biome-Specific 北方山齿鹑对干旱的反应是生物群系特有的

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management

Pub Date : 2025-08-30 DOI: 10.1016/j.rama.2025.07.001

Samantha M. Cady, Craig A. Davis, Samuel D. Fuhlendorf

Weather extremes are increasing in frequency and magnitude, and this trend is projected to continue as anthropogenic climate change progresses. These extremes can include increases in severe drought as well as anomalously heavy rainfall. As birds continue to face novel climatic pressures, including precipitation extremes, the need to hone our understanding of their variable responses is becoming increasingly urgent. Though many studies have evaluated wildlife responses to precipitation variability, less is known about possible biome-specific responses within a single species. Using a half-century of systematically collected count data, we investigate northern bobwhite (Colinus virginianus) responses to drought and abnormally high rainfall in the Great Plains and Eastern Temperate Forest biomes of North America. Our study demonstrated that, though bobwhite underwent a significant response to declining precipitation throughout its range, the direction of effect was biome-dependent. Specifically, bobwhite relative abundance declined following 12-month droughts prior to the breeding season April in the Great Plains but had a weak, positive association with drought in the Eastern Temperate Forest. This study adds complexity to our understanding of how bobwhite respond to the same environmental pressure (i.e., drought) across its geographic range and highlights the importance of developing region-specific management strategies in the face of a changing climate.

极端天气的频率和强度都在增加，预计随着人为气候变化的加剧，这一趋势将继续下去。这些极端情况可能包括严重干旱的增加以及异常的强降雨。随着鸟类继续面临新的气候压力，包括极端降水，我们对鸟类变化反应的理解变得越来越迫切。尽管许多研究已经评估了野生动物对降水变化的反应，但对单一物种内可能的生物群系特异性反应知之甚少。利用半个世纪系统收集的计数数据，研究了北美大平原和东温带森林生物群落中北方山齿鹑（Colinus virginianus）对干旱和异常高降雨的响应。研究表明，尽管山齿鹑对降水下降有显著的响应，但其影响方向与生物群落有关。具体而言，大平原地区的山齿鹑相对丰度在4月繁殖季节之前的12个月干旱后下降，但与东温带森林的干旱呈弱正相关。这项研究增加了我们对山齿鹑如何应对其地理范围内相同的环境压力（即干旱）的理解的复杂性，并强调了面对气候变化制定区域特定管理策略的重要性。

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引用次数: 0