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Competitive effect, but not competitive response, varies along a climatic gradient depending on tree species identity

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Forest Ecosystems 2024年第2期11卷 142-151页

作者： Teresa Valor llu.s coll David I.Forrester Hans Pretzsch Miren del Río Kamil Bielak Bogdan Brzeziecki Franz Binder Torben Hilmers Zuzana sitková Roberto Tognetti Aitor Ameztegui Department of Agricultural and Forest sciences and Engineering(DCEFA) University of LleidaAv.Alcalde Rovira Roure 191E25198 LleidaSpain Joint Research Unit CTFC-AGROTECNIO-CERCA Ctra.Sant LlorençKm.225280SolsonaSpain swiss Federal Institute of Forest Snow and Landscape Research WSLZürcherstrasse 1118903BirmensdorfSwitzerland CsIRO Land and Water GPO Box 1700CanberraACT2601Australia Chair of Forest Growth and Yield science School of Life Sciences WeihenstephanTechnical University of MunichHans-Carl-Von-Carlowitz-Platz 285354FreisingGermany Forest Research Center INIA-CSICCtra.A Coruña Km 7.528040MadridSpain IuFOR Sustainable Forest Management Research InstituteUniversity of Valladolid&INIASpain Department of silviculture Institute of Forest SciencesWarsaw University of Life SciencesNowoursynowska 159/3402776WarsawPoland Bavarian state Institute of Forestry(LWF) Hans-Carl-von-Carlowitz-Platz 1D-85354FreisingGermany National Forest Centre Forest Research InstituteT.G.Masaryka 2296001ZvolenSlovakia Faculty of Agricultural Environmental and Food SciencesFree University of Bozen-Bolzano Piazza Università1 I-39100Bolzano

Background: Understanding the role of species identity in interactions among individuals is crucial for assessing the productivity and stability of mixed forests over time. However, there is limited knowledge concerning the variation in competitive effect and response of different species along climatic gradients. In this study, we investigated the importance of climate, tree size, and competition on the growth of three tree species: spruce(Picea abies), fir(Abies alba), and beech(Fagus sylvatica), and examined their competitive response and effect along a climatic ***: We selected 39 plots distributed across the European mountains with records of the position and growth of 5,759 individuals. For each target species, models relating tree growth to tree size, climate and competition were proposed. Competition was modelled using a neighbourhood competition index that considered the effects of inter-and intraspecific competition on target trees. Competitive responses and effects were related to *** methods and information theory were used to select the best ***: Our findings revealed that competition had a greater impact on target species growth than tree size or climate. Climate did influence the competitive effects of neighbouring species, but it did not affect the target species? response to competition. The strength of competitive effects varied along the gradient, contingent on the identity of the interacting species. When the target species exhibited an intermediate competitive effect relative to neighbouring species, both higher inter-than intraspecific competitive effects and competition reduction occurred along the gradient. Notably, species competitive effects were most pronounced when the target species' growth was at its peak and weakest when growing conditions were far from their ***: Climate modulates the effects of competition from neighbouring trees on the target tree and not the susceptibility of th

关键词： Competition coefficient Competition reduction Interspecific competition Intraspecific competition Mixing effects Mixed species forest Neighbourhood models Plant-plant interactions

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Assessing Post-storm Forest Dynamics in the Pyrenees Using High-Resolution LIDAR Data and Aerial Photographs

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Journal of Mountain science 2015年第4期12卷 841-853页

作者： ángela BLáZQUEZ-CAsADO José R.GONZáLEZ-OLABARRIA santiago MARTíN-ALCóN Ariadna JUsT Mariló CABRé llu.s coll Forest sciences Center of Catalonia (CTFC) Institut Cartogràfic i Geològic de Catalunya (ICGC)

We evaluated how historical storm events have shaped the current forest landscape in three Pyrenean subalpine forests(NE spain).For this purpose we related forest damage estimations obtained from multi-temporal aerial photographic comparisons to the current forest typology generated from airborne Li DAR data, and we examined the role of past natural disturbance on the current spatial distribution of forest structural *** found six forest structural types in the landscape: early regeneration(T1 and T2), young even-aged stands(T3), uneven-aged stands(T4) and adult stands(T5and T6).All of the types were related to the timing and severity of past storms, with early-regeneration structures being found in areas markedly affected in recent times, and adult stands predominating in those areas that had suffered lowest damage levels within the study *** general, landscapes where high or medium levels of damage were recurrent also presented higher levels of spatial heterogeneity,whereas the opposite pattern was found in the less markedly affected landscape, characterized by thepresence of large regular *** results show the critical role that storm regimes in terms of timing and severity of past storms can play in shaping current forest structure and future dynamics in subalpine *** knowledge gained could be used to help define alternative forest management strategies oriented toward the enhancement of landscape heterogeneity as a measure to face future environmental uncertainty.

关键词： storm regime Forest succession Forest structure Airborne Li DAR spatial patterns Pyrenean subalpine forests

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城市中心区的结核病分子流行病学与传统流行病学

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国际结核病与肺部疾病杂志 2001年第4期 172-179页

作者： J.solsona J.A.Caylà E.Verdú M.P.Estrada s.Garcia D.RocaDirección de Asistencia Primària (DAP) de Ciutat Vella (Barcelona) reas Básicas de salud (ABs) 'Raval Nord' 'Raval sud' 'Casc Antic' 'Gàtic' 'llu.s sayé' y 'Barceloneta' B.Miquel P.coll F.March the Cooperative Group for Contact study of Tuberculosis Patients in Ciutat Vella 张宗德 Centro de Prevención y Control de la Tuberculosis 'Dr llu.s sayé servicio de Epidemiologia. Instituto Municipal de la salud Hospital de san Pau Servei de Microbiologia Dirección de Asistencia Primària (DAP) de Ciutat Vella (Barcelona) reas Básicas de Salud (ABS) 'Raval Nord' 'Raval Sud' 'Casc Antic' 'Gàtic' 'Lluís Sayé' y 'Barceloneta' Departament de Genética i Microbiologia Universidad Autònoma de Barcelona Barcelona Spain

背景:分子流行病学在近期的结核病传播中的重要性得到了加强,但同时也发现了一些与传统流行病学的显著区别。目的:1.在城市中心区的结核病高流行区(163/100000)和有成簇危险的人群中用RFLP法确定成簇病例的百分比。2.比较传统接触者追... 详细信息

背景:分子流行病学在近期的结核病传播中的重要性得到了加强,但同时也发现了一些与传统流行病学的显著区别。目的:1.在城市中心区的结核病高流行区(163/100000)和有成簇危险的人群中用RFLP法确定成簇病例的百分比。2.比较传统接触者追踪法(CCT)与RFLP法的作用。分析:1997-1998年间巴塞罗纳市Ciutat Vella区收集的培养阳性的165例标本,利用Is6110和pTBN12(PGRs)序列进行RFLP分析:对251例公布的病例中的171例(68.1％)进行了接触者追踪调查。通过计算比值比(OR)、使用95％的可信区间(CI)评价它们之间的联系。多变量的分析采用逻辑回归。结果:通过RFLP分析,发现76例(46.0％)的分离株在Is6110和PGRs序列上有成簇现象,通过传统接触者追踪法(CCT),在858名接触者中,发现了30名新病人,57名病人存在关联。就RFLP和CCT调查结果来看,主要危险因素为静脉吸毒(IVDU)。44名独居者病例未包括在传统接触者追踪中,50％的病例用RFLP分析存在成簇。RFLP和CCT法的符合率为8/13(61.5％);5例不符合者为新近的非洲移民。在随后的RFLP分析中15/55例病例发现有流行病学关联。结论:成簇病例的百分率很高。CCT在发现新病例时很有用,但在追踪传播路径时存在缺陷。CCT的覆盖面需要在被忽视的个体及与RFLP结果的符合率方面提高。

关键词：结核(TB) 传统接触追踪(CCT) RFLP 流行病学

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