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Multi-scale drivers of soil resistance predict vulnerability of seasonally wet meadows to trampling by pack stock animals in the Sierra Nevada,USA

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Ecological processes 2020年第1期9卷 364-377页

作者： Joy S.Baccei mitchel p.mcclaran Tim J.Kuhn Stephen C.Hart Environmental Systems Graduate Group University of CaliforniaMercedCA 95343USA UC Merced Vernal pools and Grassland Reserve UC Merced Natural Reserve SystemMercedCA 95343USA School of Natural Resources and the Environment University of ArizonaTucsonAZ 85721USA Resources Management and Science Yosemite National ParkEl PortalCA 95318USA Department of Life&Environmental Sciences and Sierra Nevada Research Institute University of CaliforniaMercedCA 95343USA.

Background:Meadow ecosystems have important ecological functions and support socioeconomic services,yet are subject to multiple stressors that can lead to rapid *** the Sierra Nevada of the western USA,recreational pack stock(horses and mules)use in seasonally wet mountain meadows may lead to soil trampling and meadow degradation,especially when soil water content is high and vegetation is ***:In order to improve the ability to predict meadow vulnerability to soil disturbance from pack stock use,we measured soil resistance(SR),which is an index of vulnerability to trampling disturbance,at two spatial scales using a stratified-random sampling *** then compared SR to several soil and vegetation explanatory variables that were also measured at the two spatial scales:plant community type(local scale)and topographic gradient class(meadow scale).Results:We found that local-scale differences in drivers of SR were contingent on the meadow scale,which is important because multiple spatial scale evaluation of ecological metrics provides a broader understanding of the potential controls on ecological processes than assessments conducted at a single spatial *** also found two contrasting explanatory models for drivers of SR at the local scale:(1)soil gravimetric water content effects on soil disaggregation and(2)soil bulk density and root mass influence on soil *** resistance was insufficient to sustain pack stock use without incurring soil deformation in wet plant communities,even when plant cover was maximal during a major ***:Our study provides new information on seasonally wet meadow vulnerability to trampling by pack stock animals using multi-scale drivers of SR,including the contrasting roles of soil disaggregation,friction,and *** work aims to inform meadow management efforts in the Sierra Nevada and herbaceous ecosystems in similar regions that are subject to seasonal soil saturation and livestock u

关键词： Hydrogeomorphic classification Hydrologic regime pack stock plant communities Soil properties Soil strength

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UAV and Satellite-Based Sensing to Map Ecological States at the Landscape Scale

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Open Journal of Ecology 2023年第8期13卷 560-596页

作者： Guillermo E. ponce-Campos mitchel mcclaran philip Heilman Jeffrey K. Gillan School of Natural Resources & Environment University of Arizona Tucson Arizona USA Southwest Watershed Research Center USDA Agricultural Research Service Tucson Arizona USA Bio5 Institute Tucson Arizona USA

Mapping ecological states in semi-arid rangelands is crucial for effective land management and conservation efforts because it identifies difference in the ecological conditions across a landscape. This study presents an innovative approach for mapping two ecological states, Large Shrub Grass (LSG) and Large Shrub Eroded (LSE), within the Sandy Loam Upland and Deep (SLUD) ecological sites using a combination of drone and satellite data. The methodology leverages the Largest patch Index (LpI) as a proxy metric to estimate eroded areas and classify ecological states. The integration of unmanned aerial vehicle (UAV) data with satellite-based remote sensing provides a scalable approach that can benefit various stakeholders involved in rangeland management. The study demonstrates the potential of this methodology by generating spatial layers at the landscape scale to inform on the state of rangeland ecosystems. The workflow showcases the power of remote sensing technology to map ecological states and addresses limitations in spatial coverage by integrating UAV and satellite data. By utilizing the bare ground LpI metric, which indicates the connectedness of bare ground, the methodology enables the classification of ecological states at a regional scale. This cost-effective approach potentially offers a standardized and reproducible method applicable across different sites and regions. The accuracy of the classification process is evaluated by comparing the results to ground-based polygons, dirt roads, and water locations. While the model performs well in identifying eroded areas, misclassifications occur in regions with mixed vegetation cover or low biomass. Future research should focus on incorporating temporal information from historical remote sensing archives to improve understanding of ecological state dynamics. Additionally, validation efforts can be enhanced by incorporating more ground-truth data and testing the methodology in diverse rangeland areas. The workflow

关键词： Ecological Sites Ecological States Rangeland Largest patch Index UAV Remote Sensing

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Sclerotherapy. Treatment of Varicose and Telangiectatic Leg Veins

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2011年

作者： Goldman mitchel p.

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Advances in Cosmetic and Cutaneous Laser Surgery

Advances in Cosmetic and Cutaneous Laser Surgery

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中华医学会第14次全国皮肤性病学术年会

作者： mitchel p.Goldman Clinical professor of Dermatology University of California

This lecture will discuss rejuvenation of skin through fractional CO laser, treatment of pigmented lesions with a combination of Intense pulsed Light(IpL)and Q-switched Ruby Laser and Acne treatment with photody- namic therapy(pDT). Fractional CO laser treatment combines the proven efficacy of CO laser resuffacing with the promotion of rapid healing through tissue preservation. Unlike other fractionated laser wavelengths, 10,640nm given in a micro-

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光动力疗法与医学美容美容皮肤科实用技术

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丛书名：国际经典美容皮肤科学丛书

2007年

作者：（美）mitchel p. Goldman 李峻亨主译

本书主要介绍光动力疗法在美容皮肤科中的应用，内容包括光动力疗法的机制、光动力疗法治疗痤疮、皮肤癌前期病变、皮肤癌预防性治疗和治疗、人类乳头瘤状病毒的治疗等。

ISBN: (纸本)7509108195

关键词：医药、卫生皮肤病学与性病学

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以眼还眼

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作者： (美)米切尔·p. 罗斯(mitchel p. Roth)

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