Characterizing Non-Industrial Private Forest Landowners' Forest Management Engagement and Advice Sources     

Morgan A. Crowley  Joel Hartter  Russell G. Congalton  Lawrence C. Hamilton  Nils D. Christoffersen 《社会与自然资源》2019,32(2):204-221

Non-industrial private forestland (NIPF) owners have options for engagement by following management strategies that reduce wildfire risk on their forestlands. Forest management engagement is a broad term with underlying categories and management implications. To better understand these categories, we examine interview data on the engagement of forest landowners from a case study of private forestland owner perspectives in northeast Oregon, USA. NIPF landowners outline two types of forest management engagement, one for property and one for community-focused forestland management. NIPF owners describe actions for engagement in public forestland management and how these actions differ from engagement in private management. Additionally, NIPF owners establish barriers to engagement in both public and private forestland management. Our findings can be used to better identify unengaged private forestland owners in the U.S. West, informing the design and implementation of extension and outreach for NIPF owners.  相似文献   

Chloride in precipitation and streamwater for the upland catchment of river severn,mid-wales; some consequences for hydrochemical models     

Colin Neal  Nils Christophersen  Richard Neale  Christopher J. Smith  Paul G. Whitehead  Brian Reynolds 《水文研究》1988,2(2):155-165

Variations in the concentration of Cl in rainfall and stream runoff are presented for two catchments in the Hafren forest of mid-Wales, Great Britain. Despite the large fluctuations in rainfall concentrations, Cl in the streamwater remains relatively constant. Using the two-reservoir Birkenes model, an attempt was made to simulate observed Cl in streamwater. The original model was unable to reproduce the observations and several modifications are suggested to provide better simulations. The resulting model is not the only one capable of reproducing the observations; other hydrochemical models will most probably also achieve this although emphasis will in each case be placed on different aspects. In this paper, it is suggested that the stochastic properties of water movement and chemical processes can account for the streamwater chemistry responses observed. On the catchment scale these processes will lead to an apparently deterministic behaviour that may well be described by simple relationships.  相似文献   

A note on the gravitational field of Phobos     

Nils Aall Barricelli 《Earth, Moon, and Planets》1988,43(3):307-309

Phobos' proximity to the Roche limit, and some of its consequences deserving attention by the Phobos' mission, are the subject of this note.  相似文献   

Proceedings of the Pro Mare Symposium on Polar Marine Ecology, Trondheim, Norway, 12-16 May 1990     

Egil Sakshaug  Christopher C.E. Hopkins  Nils Are Øritsland 《Polar research》1991,10(1):1-4

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3D modelling of hydrothermal alteration associated with VHMS deposits in the Kristineberg area,Skellefte district,northern Sweden     

Riia M. Chmielowski  Nils Jansson  Mac Fjellerad Persson  Pia Fagerström 《Mineralium Deposita》2016,51(1):113-130

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Changes in monsoon-driven upwelling in the South China Sea over glacial Terminations I and II: a multi-proxy record     

Henrik Sadatzki  Michael Sarnthein  Nils Andersen 《International Journal of Earth Sciences》2016,105(4):1273-1285

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Equilibrium and structural studies of silicon(iv) and aluminium(iii) in aqueous solution. V. Acidity constants of silicic acid and the ionic product of water in the medium range 0.05–2.0 M Na(CI) at 25°C     

Staffan Sjöberg  Yvonne Hägglund  Agneta Nordin  Nils Ingri 《Marine Chemistry》1983,13(1):35-44

The apparent ionization constants for silicic acid, k₁ and k₂, and the ionic product of water, k_w, have been determined in 0.05, 0.1, 0.2, 0.4 and 2.0 M Na(CI) media at 25°C. The medium dependence of these constants was found to fit equations of the form where K₁ is the ionization constant in pure water, α_i and b_i are parameters of which b_i has been adjusted to present data. The following results were obtained (α_i, b_i): pK₁ = 9.84, (1.022, ?0.11); pK₂ = 13.43, (2.044, ?0.20); and pK_w = 14.01 (1.022, ?0.22). k_i values are collected in Tables I and II. Attempts have been made to explain the medium dependence of k₁ and k₂ with weak sodium silicate complexing according to the equilibria giving k₁₁ = 0.37M^?1 and k₂₁= 3.0M^?1. However, these weak interactions cannot be interpreted unambiguously from potentiometric data at different 1-levels. Probably the medium dependence could equally well be expressed by variations in the activity coefficients.The measurements were performed as potentiometric titrations using a hydrogen electrode. The average number of OH^- reacted per Si(OH)₄, Z, has been varied within the limits 0 ? Z ? 1.1 and B₁, the total concentration of Si(OH)₄, between 0.001 M and 0.008 M. k₁ was evaluated from experimental data with B ? 0.003 M, and k₂ with B ? 0.008 M and Z ? 0.95.  相似文献   

Behaviour of herring (Clupea harengus L.) towards an approaching autonomous underwater vehicle     

Patel  Ruben; Handegard  Nils Olav; Godo  Olav Rune 《ICES Journal of Marine Science》2004,61(7):1044-1049

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Seasonal distribution, exploitation and present abundance of stocks of large baleen whales (Mysticeti) and sperm whales (Physeter macrocephalus) in Norwegian and adjacent waters   总被引：1，自引：0，他引：1  

Christensen  Ivar; Haug  Tore; Oien  Nils 《ICES Journal of Marine Science》1992,49(3):341-355

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Where could catch shares prevent stock collapse?     

Florian K. Diekert  Anne Maria Eikeset  Nils Chr. Stenseth 《Marine Policy》2010

In a widely received study Costello and his colleagues found that catch shares give better stock persistence and higher catch for fishermen. The conclusions made by Costello et al. were further supported by Grafton and McIlgorm where they suggested a framework in order to determine the costs and benefits of separate ITQ management in seven Australian commonwealth fisheries, and what the alternatives should be if the net benefits do not justify ITQs. This raises the question why we do not see catch shares being used more often. We explore at a global scale which countries would have the potential to, and indeed do, fulfil the conditions necessary to implement such a management strategy.  相似文献