Landscape Ecology最新文献_第6页

Green or grain? Impact of green space expansion on grain production in Chinese cities and its implications for national urban greening schemes 绿化还是粮食？中国城市绿地扩张对粮食生产的影响及其对国家城市绿化计划的启示

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-06-17 DOI: 10.1007/s10980-024-01921-0

Yulin Dong, Wenhui Kuang, Zhibin Ren, Yinyin Dou, Xiangzheng Deng

Context

Expansion of urban green space (UGS) enhances greenery and its benefits in cities. However, the impacts of such expansions on regional landscape sustainability and their spatiotemporal traits across the national scale remain unclear.

Objectives

This study uncovers a trade-off between agricultural ecosystem services and urban human well-being—the loss of grain production due to UGS expansion consuming cropland—in China from 2000 to 2020. It proposes a safety boundary for UGS expansion to minimize the costs of grain production while addressing the escalating demand for UGS exposure.

Methods

UGS expansion and cropland loss are quantified using land cover products, with statistical data contributing to the established relationship between grain loss and UGS coverage. UGS expansion scenarios for 2040 are simulated through bottom-up modeling.

Results

Quadrupled UGS area growth contributed approximately one-third to urban expansion during 2000–2020 in China. Despite improvements in per capita UGS area implying enhanced UGS exposure during rapid urbanization, UGS expansion resulted in a national grain production loss of 4.2 ± 1.4 million t from 2000 to 2020, accelerating post-2010. This loss is equivalent to the annual food intake of 9.3 million Chinese people. We propose a 30.87% UGS coverage target in China by 2040 to preserve UGS access while minimizing grain loss under future urbanization.

Conclusions

Acknowledging the critical role of UGS expansion in the issue of cropland loss to urbanization is imperative. Our results offer insights into ensuring human well-being and ecosystem services through landscape and urban planning.

背景城市绿地（UGS）的扩展提高了城市的绿化及其效益。本研究揭示了 2000 年至 2020 年中国农业生态系统服务与城市人类福祉之间的权衡--城市绿地扩张消耗耕地导致的粮食产量损失。本研究提出了扩大城市综合服务系统的安全边界，以最大限度地降低粮食生产成本，同时应对不断增长的城市综合服务系统风险需求。研究方法：利用土地覆被产品对城市综合服务系统的扩大和耕地损失进行量化，统计数据有助于确定粮食损失与城市综合服务系统覆盖率之间的关系。通过自下而上的模型模拟了 2040 年的 UGS 扩张情景。结果2000-2020 年期间，UGS 面积的翻番式增长约占中国城市扩张的三分之一。尽管在快速城市化过程中，人均 UGS 面积的增加意味着 UGS 暴露程度的提高，但 UGS 的扩张导致 2000-2020 年间全国粮食产量损失为 420±140 万吨，2010 年后损失加速。这一损失相当于 930 万中国人的年粮食摄入量。我们建议中国到 2040 年实现 30.87% 的粮食保障计划覆盖率目标，以保护粮食保障计划的可及性，同时最大限度地减少未来城市化进程中的粮食损失。我们的研究结果为通过景观和城市规划确保人类福祉和生态系统服务提供了启示。

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引用次数: 0

Same, but different: similar states of forest structure in temperate mountain regions of Europe despite different social-ecological forest disturbance regimes 同中有异：欧洲温带山区森林结构状态相似，但社会生态森林干扰机制不同

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-06-03 DOI: 10.1007/s10980-024-01908-x

Ana Stritih, Cornelius Senf, Tobias Kuemmerle, Catalina Munteanu, Lasha Dzadzamia, Jernej Stritih, Dragan Matijašić, Owen Cortner, Rupert Seidl

Context

Ecosystem services provided by mountain forests are critically linked to forest structure. Social-ecological disturbance regimes (i.e., the rate, frequency, and patch size distribution of disturbances driven by interacting natural and anthropogenic processes) and land use affect forest structure, but their specific impacts are not fully understood.

Objectives

We examine how differences in disturbance regimes affect patterns of forest structure across three European mountain ranges with similar vegetation types but different land-use histories: the European Alps, the Carpathians, and the Caucasus.

Methods

We related data on horizontal and vertical forest structure, measured by spaceborne lidar (GEDI), with Landsat-derived information on forest disturbances (1986–2020) and topographic, climatic, and anthropogenic predictors.

Results

We found similar social-ecological disturbance regimes in the Alps and Carpathians (average annual disturbance rates of 0.34% and 0.39%, respectively, and median patch size < 0.5 ha), yet much lower disturbance rates and patch sizes in the Caucasus (0.08% yr⁻¹ and < 0.2 ha). Despite different disturbance regimes, we found similar patterns of forest structure. Two alternative states emerged consistently across all mountain ranges: a tall and closed-canopy state in 74–80% of forests and a low and open-canopy state (< 50% canopy cover) in the rest. While forest structure responded consistently to abiotic drivers such as topography and climate, its association with anthropogenic pressures differed between mountain ranges. Stand-replacing disturbances played an important role in the Carpathians, while forest structure in the Caucasus was related to proximity to settlements, reflecting local forest use.

Conclusions

Different social-ecological contexts in mountain regions can produce markedly different forest disturbance regimes. Despite these differences, similar states of forest structures emerge, suggesting strong attractors of structure in temperate mountain forests.

背景山地森林提供的生态系统服务与森林结构密切相关。社会生态干扰机制（即我们研究了干扰机制的差异如何影响欧洲阿尔卑斯山脉、喀尔巴阡山脉和高加索山脉这三个植被类型相似但土地利用历史不同的山脉的森林结构模式。方法我们将空间激光雷达（GEDI）测量的水平和垂直森林结构数据与大地遥感卫星获取的森林干扰信息（1986-2020 年）以及地形、气候和人为预测因子联系起来。结果我们发现阿尔卑斯山脉和喀尔巴阡山脉的社会生态干扰机制相似（年平均干扰率分别为 0.34% 和 0.39%，中位斑块面积为 0.5 公顷），但高加索地区的干扰率和斑块面积要低得多（年平均干扰率为 0.08% 和 0.2 公顷）。尽管扰动机制不同，但我们发现了类似的森林结构模式。在所有山脉中都出现了两种可供选择的状态：74-80%的森林处于高大和郁闭树冠状态，其余森林处于低矮和开阔树冠状态（树冠覆盖率为 50%）。虽然森林结构对地形和气候等非生物驱动因素的反应是一致的，但其与人为压力的关系却因山脉而异。在喀尔巴阡山脉，立地重置干扰起着重要作用，而高加索地区的森林结构则与是否靠近居民点有关，这反映了当地的森林使用情况。尽管存在这些差异，但却出现了类似的森林结构状态，这表明温带山区森林结构具有很强的吸引力。

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引用次数: 0

Land-use change alters specialist bee diet and drives body size declines 土地使用的变化改变了特种蜂的食性，并导致体型缩小

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-06-03 DOI: 10.1007/s10980-024-01893-1

Sarah E. Anderson, Philip Hahn, Gabriela Gonzalez, Rachel E. Mallinger

Context

Land-use change can cause decreases in plant abundance and richness and the replacement of wild plants with domesticated plants. Changes in plant community composition disrupt mutualistic plant-pollinator interactions with ecological consequences for plants and pollinators, and especially for specialists that rely on certain plants.

Objectives

We assessed the effects of land-use change and subsequent shifts in plant communities on resource collection and body size for a bee pollinator, Habropoda laboriosa, a purported specialist of blueberries and related Ericaceae plants.

Methods

We collected Habropoda laboriosa across a gradient of land use in north-central Florida including agricultural, natural, and urban habitats. We assessed landcover and floral community composition at each site and related these to bee body size (intertegular distance) and resource use (proportion host plant pollen and pollen diversity collected).

Results

Host plant pollen collection and bee body size generally responded similarly to the landscape, both increasing with habitats containing host plants (blueberry farms and natural habitat) but decreasing with urban development. However, host pollen collection and bee body size responded in opposite ways to overall cropland in the landscape, with cropland negatively affecting body size despite positively affecting host pollen collection, indicating other factors associated with cropland might drive declines in bee body size.

Conclusions

Land-use change can adversely affect bee diet and body size, and changes in diet likely contribute to changes in body size over time. Specialists are particularly at risk for negative impacts of land-use change due to their inability to shift plant hosts.

背景土地利用的变化会导致植物丰度和丰富度的下降，并以驯化植物取代野生植物。我们评估了土地利用变化和植物群落随之变化对蜜蜂授粉者 Habropoda laboriosa 的资源采集和体型的影响，蜜蜂授粉者 Habropoda laboriosa 据称是蓝莓和相关 Ericaceae 植物的专家。结果寄主植物花粉采集量和蜜蜂体型对地貌的反应大致相同，都随着含有寄主植物的栖息地（蓝莓农场和自然栖息地）的增加而增加，但随着城市的发展而减少。然而，寄主植物花粉采集量和蜜蜂体型对景观中总体耕地的反应却相反，尽管耕地对寄主植物花粉采集量有积极影响，但对蜜蜂体型却有消极影响，这表明与耕地相关的其他因素可能会导致蜜蜂体型下降。特种蜂由于无法转移植物寄主，因此特别容易受到土地利用变化的负面影响。

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引用次数: 0

Relative effects of arable land-use, farming system and agri-environment schemes on landscape-scale farmland bird assemblages 耕地使用、耕作制度和农业环境计划对景观尺度农田鸟类群落的相对影响

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-05-29 DOI: 10.1007/s10980-024-01906-z

Laura Bosco, Aleksi Lehikoinen, Markus Piha, Tuomas Seimola, Juha Tiainen, Johan Ekroos

Context

Farmland biodiversity has been declining because of agricultural intensification and landscape simplification. Many farmland birds breeding in non-crop habitats use arable land as their feeding habitat (and vice versa) and understanding habitat composition and configuration at the landscape scale is important for their conservation.

Objectives

We explored the relationship between farmland bird densities and land-use characteristics at a landscape-scale (mean size 235 ha) to reveal the most important land-use elements driving avian farmland abundance.

Methods

We used bird territory mapping from 36 study landscapes across Finland to study relationships between densities of total farmland birds, open field species, edge species, farmyard species, and Farmland Bird Indicator (FBI) species, and multiple descriptors of the composition and configuration of the study landscape mosaics, reflecting the full range of available crop types, farmland structures, non-crop habitat types, and soil type.

Results

Densities of farmland birds increased with greater areas of leys and pastures, subsidized grasslands, habitat diversity, and farmyards with animals, and those effects were consistently stronger compared to effects of non-crop habitats. Positive effects of the relative area of leys and pastures in the landscape was most often consistent in the species-specific models, whereas species-level responses to other landscape characteristics were idiosyncratic, reflecting the variety of the species’ ecologies and habitat requirements.

Conclusions

We demonstrate that overall habitat diversity, and habitat elements like subsidized grasslands, pastures, and farmsteads with animal production support higher bird diversity at the level of landscape mosaics. Our results suggest that studies based on field-scale study units need to be complemented with landscape-scale studies to reveal a holistic understanding of land-use intervention impacts on farmland birds.

背景由于农业集约化和景观简化，农田生物多样性不断减少。我们探讨了景观尺度（平均面积为 235 公顷）上农田鸟类密度与土地利用特征之间的关系，以揭示驱动农田鸟类丰度的最重要的土地利用要素。方法我们利用芬兰 36 个研究景观的鸟类领地分布图，研究了农田鸟类总数、空地物种、边缘物种、农田物种和农田鸟类指标（FBI）物种的密度与研究景观镶嵌的组成和配置的多个描述因子之间的关系，这些描述因子反映了所有可用的作物类型、农田结构、非作物栖息地类型和土壤类型。结果农田鸟类的密度随着leys和牧场、补贴草地、栖息地多样性和有动物的农田面积的增加而增加，与非作物栖息地的影响相比，农田鸟类的影响更强。在物种特异性模型中，景观中牧场和草场相对面积的积极影响最为常见，而物种对其他景观特征的反应则具有特异性，反映了物种生态和栖息地要求的多样性。我们的研究结果表明，基于田野尺度研究单元的研究需要辅以景观尺度研究，以全面了解土地利用干预对农田鸟类的影响。

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引用次数: 0

New criteria for sustainable land use planning of metropolitan green infrastructures in the tropical Andes 热带安第斯山脉大都市绿色基础设施可持续土地利用规划的新标准

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-05-28 DOI: 10.1007/s10980-024-01911-2

María José LaRota-Aguilera, Emmanuel Zapata-Caldas, Oscar Buitrago-Bermúdez, Joan Marull

Context

Urbanization is rapidly increasing worldwide, with about 60% of the global population currently residing in cities and expected to reach 68% by 2050. In Latin America's tropical Andes region, managing these changes poses challenges, including biodiversity loss and vulnerability to climate change.

Objectives

This study assesses urban growth and agricultural intensification impacts on the ecological functionality of metropolitan green infrastructures and their capacity to provide ecosystem services using a landscape sustainability and sociometabolic approach. Specifically, it aims to identify landscape configurations promoting socio-ecological sustainability amidst rapid urbanization.

Methods

A landscape-metabolic model (IDC) was applied to evaluate the interactions between land use changes and ecosystem functions in the metropolitan region of Cali.

Results

Agricultural intensification and industrialization, coupled with uncontrolled urban growth, have significantly transformed the landscape, posing threats to its sustainability. The prevailing biocultural landscapes hold a substantial potential to provide essential ecosystem services to the metropolis. The IDC offers an approach that utilizes a land cover map and agricultural production/metabolism data to calculate an indicator closely related to ecosystem services and multifunctionality.

Conclusions

The IDC model stands out for efficiently capturing landscape dynamics, providing insights into landscape configuration and social metabolism without extensive resource requirements. This research highlights the importance of adopting a landscape-metabolic and green infrastructure framework to guide territorial policies in the tropical Andes and similar regions. It stresses the need for informed land use planning to address challenges and leverage opportunities presented by biocultural landscapes for regional sustainability amidst rapid urbanization and agricultural expansion.

背景城市化在全球范围内迅速发展，目前全球约有 60% 的人口居住在城市，预计到 2050 年将达到 68%。本研究采用景观可持续性和社会计量代谢方法，评估城市增长和农业集约化对大都市绿色基础设施的生态功能及其提供生态系统服务能力的影响。具体而言，该研究旨在确定在快速城市化过程中促进社会生态可持续性的景观配置。结果农业集约化和工业化，加上无节制的城市增长，极大地改变了景观，对其可持续性构成了威胁。现有的生物文化景观具有为大都市提供基本生态系统服务的巨大潜力。IDC 提供了一种利用土地覆被图和农业生产/代谢数据来计算与生态系统服务和多功能性密切相关的指标的方法。这项研究强调了在热带安第斯山脉和类似地区采用景观代谢和绿色基础设施框架来指导领土政策的重要性。它强调了在快速城市化和农业扩张的过程中，有必要进行知情的土地利用规划，以应对生物文化景观带来的挑战并利用其机遇促进地区的可持续发展。

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引用次数: 0

Time-lag effects of habitat loss, but not fragmentation, on deadwood-dwelling lichens 栖息地丧失（而非破碎化）对枯木栖息地草本植物的时滞效应

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-05-28 DOI: 10.1007/s10980-024-01910-3

Aino Hämäläinen, Lenore Fahrig

Context

Landscape habitat amount is known to increase biodiversity, while the effects of habitat fragmentation are still debated. It has been suggested that negative fragmentation effects may occur with a time lag, which could explain inconsistent results. However, there is so far no empirical support for this idea.

Objectives

We evaluated whether habitat amount and fragmentation at the landscape scale affect the species density of deadwood-dwelling lichens, and whether these effects occur with a time lag.

Methods

We surveyed deadwood-dwelling lichens in woodland key habitats in two regions in northern Sweden, and modelled their species density as a function of past (1960s) and present (2010s) habitat amount (old forest area) and fragmentation (edge density) in the surrounding landscapes.

Results

Present habitat amount generally had weak positive effects on lichen species density. Positive effects of the past habitat amount were stronger, indicating a time lag in habitat amount effects. Habitat fragmentation effects were generally weak and similar whether fragmentation was measured in the past or the present landscapes, indicating no time lag in fragmentation effects.

Conclusions

We found a time lag effect of habitat amount, but not fragmentation. This result is not consistent with suggestions that time lags explain the mixed observations of fragmentation effects. Time-lag effects of habitat amount suggest that the studied lichen communities face an extinction debt. Conservation should therefore prioritize increasing the amount of old forest, for example by creating forest reserves, to maintain the current lichen diversity. More generally, our results imply that studies examining only the present habitat amount risk under-estimating its importance.

背景众所周知，景观栖息地数量可增加生物多样性，而栖息地破碎化的影响仍存在争议。有观点认为，片段化的负面影响可能会随着时间的推移而发生，这可以解释不一致的结果。我们评估了景观尺度上的栖息地数量和破碎化是否会影响枯木栖息地草本植物的物种密度，以及这些影响是否会出现时间差。方法我们调查了瑞典北部两个地区林地主要栖息地中的枯木栖息地草本植物，并将其物种密度与周围景观中过去（20 世纪 60 年代）和现在（2010 年代）的栖息地数量（老林区）和破碎化程度（边缘密度）建立了模型。过去的栖息地数量对地衣物种密度的正面影响较强，表明栖息地数量的影响存在时滞。栖息地破碎化效应一般较弱，而且无论是在过去还是现在的景观中测量破碎化程度，其效应都相似，这表明破碎化效应没有时滞。这一结果与认为时间滞后可以解释破碎化效应的混合观测结果的观点不一致。栖息地数量的时滞效应表明，所研究的地衣群落面临着灭绝债务。因此，保护工作应优先考虑增加古老森林的数量，例如建立森林保护区，以维持当前的地衣多样性。更广泛地说，我们的研究结果表明，仅研究目前的栖息地数量可能会低估其重要性。

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引用次数: 0

Behavioral state-dependent selection of roads by guanacos 鬣羚根据行为状态选择道路

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-05-27 DOI: 10.1007/s10980-024-01909-w

Mitchell W. Serota, Pablo A. E. Alarcón, Emiliano Donadio, Arthur D. Middleton

Context

Widespread globally, roads impact the distribution of wildlife by influencing habitat use and avoidance patterns near roadways and disrupting movement across them. Wildlife responses to roads are known to vary across species; however within species, the response to roads may depend on the season or the individual’s behavioral state.

Objectives

We assess the movement behavior and space use of the most widespread large herbivore in Patagonia, the guanaco (Lama guanicoe). We estimated the preference or avoidance to paved or unpaved roads (the proximity effect) and the preference or avoidance to traverse them (the crossing effect).

Methods

Using GPS collar data, we combined Hidden Markov Models with an integrated step selection analysis to segment guanaco movement trajectories into individual behaviors and test for differences in road effects on movement.

Results

We found that guanacos display distinct movement responses to different types of roads depending on their behavioral state. Guanacos select for proximity to paved roads while foraging, but against them when traveling. Yet, guanacos select for unpaved roads when traveling. Despite the selection for proximity to paved roads, guanacos avoid crossing them, irrespective of their behavioral state.

Conclusion

Our findings offer significant implications for guanaco distribution and management across Patagonia. The selection for roads strongly influences the distribution of guanacos, which could concentrate grazing in some areas while freeing others. Despite potential benefits such as increased vegetation near roadsides, increased association with roads while foraging may result in an ecological trap. Finally, the strong aversion to crossing paved roads raises concerns about habitat loss and connectivity.

背景在全球范围内，道路通过影响栖息地的使用和避开道路附近的模式以及干扰穿越道路的行动，对野生动物的分布产生影响。众所周知，野生动物对道路的反应因物种而异；但在物种内部，对道路的反应可能取决于季节或个体的行为状态。目标我们评估了巴塔哥尼亚地区最广泛分布的大型食草动物--番牛科动物（Lama guanicoe）的移动行为和空间利用。方法利用 GPS 颈圈数据，我们将隐马尔可夫模型与综合阶跃选择分析相结合，将观鸟的运动轨迹划分为个体行为，并检验道路对运动影响的差异。结果我们发现，观鸟根据其行为状态对不同类型的道路表现出不同的运动反应。驼鸟在觅食时会选择靠近铺设好的道路，而在行进时则会反对靠近铺设好的道路。然而，疣羚在行进时会选择未铺设路面的道路。结论：我们的研究结果对巴塔哥尼亚地区观鸟的分布和管理具有重要意义。对道路的选择极大地影响了瓜纳科鸟的分布，这可能会使一些地区集中放牧，而另一些地区则可以自由放牧。尽管有潜在的好处，如增加路边的植被，但觅食时与道路的更多联系可能会导致生态陷阱。最后，关东羚对穿越铺设好的道路的强烈反感引发了对栖息地丧失和连通性的担忧。

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引用次数: 0

Correction: Inferring future changes in gene flow under climate change in rivers capes: a pilot case study in fluvial sculpin 更正：推断河流岬角在气候变化下基因流的未来变化：河口鲭的试点案例研究

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-05-27 DOI: 10.1007/s10980-024-01904-1

Souta Nakajima, Hiroaki Suzuki, Makoto Nakatsugawa, Ayumi Matsuo, Shun K. Hirota, Yoshihisa Suyama, Futoshi Nakamura

引用次数: 0

From past habitats to present threats: tracing North American weasel distributions through a century of climate and land use change 从过去的栖息地到现在的威胁：通过一个世纪的气候和土地利用变化追踪北美黄鼠狼的分布情况

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-05-03 DOI: 10.1007/s10980-024-01902-3

Amanda E. Cheeseman, David S. Jachowski, Roland Kays

Context

Shifts in climate and land use have dramatically reshaped ecosystems, impacting the distribution and status of wildlife populations. For many species, data gaps limit inference regarding population trends and links to environmental change. This deficiency hinders our ability to enact meaningful conservation measures to protect at risk species.

Objectives

We investigated historical drivers of environmental niche change for three North American weasel species (American ermine, least weasel, and long-tailed weasel) to understand their response to environmental change.

Methods

Using species occurrence records and corresponding environmental data, we developed species-specific environmental niche models for the contiguous United States (1938–2021). We generated annual hindcasted predictions of the species’ environmental niche, assessing changes in distribution, area, and fragmentation in response to environmental change.

Results

We identified a 54% decline in suitable habitat alongside high levels of fragmentation for least weasels and region-specific trends for American ermine and long-tailed weasels; declines in the West and increased suitability in the East. Climate and land use were important predictors of the environmental niche for all species. Changes in habitat amount and distribution reflected widespread land use changes over the past century while declines in southern and low-elevation areas are consistent with impacts from climatic change.

Conclusions

Our models uncovered land use and climatic change as potential historic drivers of population change for North American weasels and provide a basis for management recommendations and targeted survey efforts. We identified potentially at-risk populations and a need for landscape-level planning to support weasel populations amid ongoing environmental changes.

背景气候和土地利用的变化极大地改变了生态系统，影响了野生动物种群的分布和状况。对于许多物种来说，数据缺口限制了对种群趋势以及与环境变化之间联系的推断。我们调查了三种北美黄鼬（美洲狐鼬、小黄鼬和长尾黄鼬）环境生态位变化的历史驱动因素，以了解它们对环境变化的反应。方法利用物种出现记录和相应的环境数据，我们为美国毗连地区（1938-2021 年）开发了特定物种的环境生态位模型。结果我们发现最小黄鼠狼的适宜栖息地减少了 54%，同时破碎化程度较高；美洲朱鼠和长尾黄鼠狼的适宜栖息地呈地区性趋势；西部地区适宜栖息地减少，东部地区适宜栖息地增加。气候和土地利用是预测所有物种环境生态位的重要因素。栖息地数量和分布的变化反映了过去一个世纪中广泛的土地利用变化，而南部和低海拔地区栖息地数量的减少与气候变化的影响是一致的。我们发现了潜在的濒危种群，以及在持续的环境变化中支持黄鼠狼种群的景观规划需求。

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引用次数: 0

Short-term evolution pattern in salt marsh landscapes: the importance of physical constraints 盐沼地貌的短期演化模式：物理约束的重要性

IF 5.2 2区环境科学与生态学 Q1 ECOLOGY

Landscape Ecology

Pub Date : 2024-05-03 DOI: 10.1007/s10980-024-01898-w

Liming Xue, Tianyou Li, Xiuzhen Li, Yuxin Bi, Lin Su, Yuanhao Song, Wenzhen Zhao, Jianzhong Ge, Qing He, Benwei Shi

Context

Salt marsh landscapes at the land-sea interfaces exhibit contrasting spatiotemporal dynamics, resulting from varying physical constraints that limit new marsh establishment. The expansion of salt marsh landscapes towards the sea or their retreat towards the land is determined by patch-level changes, relying on the balance of power between the intrinsic biota traits and external physical disturbances.

Objectives

Examine how marsh dynamics respond to physical constraints, and clarify the pathway from coupled physical processes involving hydrodynamic forces, sediment transport, and morphological changes to rapid patch evolution and landscape changes.

Methods

We defined and distinguished four types of marsh changes based on patch proximities from five-month drone images in two typical marsh pioneer zones of the Yangtze Estuary, China: outlying expansion, edge expansion, infilling expansion, and retreat. Hydrodynamics and sediment transport were synchronously measured and compared near the two marsh edges, and morphological changes were generated by drone-derived digital elevation models (DEMs).

Results

We identified distinct seasonal patterns of net marsh expansion at the accretion-prone site, that is: Net marsh expansion started from the outlying expansion in spring, followed by edge expansion in summer and infilling expansion in autumn. However, at the erosion-prone site that experienced high bed shear stress, low sediment availability and high seaward sediment transport, we only observed limited infilling and edge expansion in spring. This suggests that the potential for long-distance patch formation beyond the initial marsh edges is diminished in areas subjected to intensive physical disturbances.

Conclusions

Patch evolution dynamics in response to site-specific physical constraints drive state differentiation of salt marsh landscape changes. Consequently, the heterogeneous evolution in salt marsh landscapes should be taken into account in restoration practice.

背景海陆交界处的盐沼地貌呈现出截然不同的时空动态，这是由于限制新沼泽建立的物理约束条件不同造成的。盐沼景观向海洋扩展或向陆地退缩是由斑块级变化决定的，取决于内在生物群落特征与外部物理干扰之间的力量平衡。方法我们在中国长江口的两个典型沼泽先行区，根据为期五个月的无人机图像中的斑块邻近度，定义并区分了四种类型的沼泽变化：外围扩展、边缘扩展、填充扩展和退缩。对两个沼泽边缘附近的水动力和沉积物运移进行了同步测量和比较，并通过无人机获得的数字高程模型（DEM）生成了形态变化：沼泽净扩展始于春季的外围扩展，随后是夏季的边缘扩展和秋季的填充扩展。然而，在海床剪应力大、沉积物可用性低和向海沉积物迁移量大的易受侵蚀地点，我们只观察到春季有限的内填和边缘扩展。这表明，在受到强烈物理干扰的地区，最初沼泽边缘以外的长距离斑块形成的潜力减弱了。因此，在恢复实践中应考虑到盐沼景观的异质性演变。

{"title":"Short-term evolution pattern in salt marsh landscapes: the importance of physical constraints","authors":"Liming Xue, Tianyou Li, Xiuzhen Li, Yuxin Bi, Lin Su, Yuanhao Song, Wenzhen Zhao, Jianzhong Ge, Qing He, Benwei Shi","doi":"10.1007/s10980-024-01898-w","DOIUrl":"https://doi.org/10.1007/s10980-024-01898-w","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Context</h3><p>Salt marsh landscapes at the land-sea interfaces exhibit contrasting spatiotemporal dynamics, resulting from varying physical constraints that limit new marsh establishment. The expansion of salt marsh landscapes towards the sea or their retreat towards the land is determined by patch-level changes, relying on the balance of power between the intrinsic biota traits and external physical disturbances.</p><h3 data-test=\"abstract-sub-heading\">Objectives</h3><p>Examine how marsh dynamics respond to physical constraints, and clarify the pathway from coupled physical processes involving hydrodynamic forces, sediment transport, and morphological changes to rapid patch evolution and landscape changes.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>We defined and distinguished four types of marsh changes based on patch proximities from five-month drone images in two typical marsh pioneer zones of the Yangtze Estuary, China: outlying expansion, edge expansion, infilling expansion, and retreat. Hydrodynamics and sediment transport were synchronously measured and compared near the two marsh edges, and morphological changes were generated by drone-derived digital elevation models (DEMs).</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>We identified distinct seasonal patterns of net marsh expansion at the accretion-prone site, that is: Net marsh expansion started from the outlying expansion in spring, followed by edge expansion in summer and infilling expansion in autumn. However, at the erosion-prone site that experienced high bed shear stress, low sediment availability and high seaward sediment transport, we only observed limited infilling and edge expansion in spring. This suggests that the potential for long-distance patch formation beyond the initial marsh edges is diminished in areas subjected to intensive physical disturbances.</p><h3 data-test=\"abstract-sub-heading\">Conclusions</h3><p>Patch evolution dynamics in response to site-specific physical constraints drive state differentiation of salt marsh landscape changes. Consequently, the heterogeneous evolution in salt marsh landscapes should be taken into account in restoration practice.</p>","PeriodicalId":54745,"journal":{"name":"Landscape Ecology","volume":"13 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140883013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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