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   

High-pressure–low-temperature metamorphism of metasedimentary rocks, southern Menderes Massif, western Turkey     

Donna L. Whitney  Christian Teyssier  Seth C. Kruckenberg  Valerie L. Morgan  Lindsay J. Iredale 《Lithos》2008,101(3-4):218-232

Kilometer-scale lenses of quartz-rich metasedimentary rocks crop out in a discontinuous belt along the southern margin of the Menderes Massif, Turkey, and preserve evidence for high-pressure–low-temperature (HP–LT) metamorphism related to subduction of a continental margin during Alpine orogeny. Kyanite schist, quartzite, and quartz veins contain kyanite + phengite + Mg-chlorite, and the veins also contain magnesiocarpholite. A deformed carbonate metaconglomerate juxtaposed with the quartzite-dominated unit does not contain HP index minerals, and likely represents the tectonized boundary of the siliceous rocks with adjacent marble. The HP–LT rocks (10–12 kbar, 470–570 °C) record different pressure conditions than the adjacent, apparently lower pressure Menderes metasedimentary sequence. Despite this difference there is disagreement as to whether these HP–LT rocks are part of the Menderes sequence or are related to the tectonically overlying Cycladic blueschist unit. If the former, the entire southern Menderes Massif experienced HP–LT metamorphism but the evidence has been obliterated from most rocks; if the latter, rocks recording different metamorphic-kinematic conditions experienced different tectonic histories and were tectonically juxtaposed during thrusting. Based on observations and data in this study, the second model better accounts for the differences in P–T-deformation histories of the southern Menderes Massif rocks, and suggests that the HP–LT rocks are not part of the Menderes cover sequence.  相似文献   

Slow regolith degradation without creep determined by cosmogenic nuclide measurements in Arena Valley, Antarctica     

Jaakko Putkonen  Greg Balco  Daniel Morgan 《Quaternary Research》2008,69(2):242-249

Estimates of regolith degradation in the McMurdo Dry Valleys of Antarctica are currently based on indirect evidence and ancient ashes at or near the soil surface that suggest excellent preservation of surfaces. On the other hand, the existing cosmogenic-nuclide surface exposure ages from many parts of the Dry Valleys are younger than the age of surface deposits inferred from stratigraphic relations. This suggests some combination of surface erosion or past ice cover, both of which would reduce the apparent exposure age. This paper quantifies the regolith degradation and/or past ice cover by measuring ¹⁰Be and ²⁶Al from a landslide deposit that contains 11.3 Ma volcanic ash. The surface sample yields an apparent exposure age of only 0.4 Ma. However, measurements of the subsurface nuclide concentrations show that the deposit has not been shielded by ice, and that the age of the ash does not conflict with the apparent exposure age when slow degradation of the deposit (2 m Ma⁻¹) is taken into account. Soil creep, which is a common degradational process in a wide variety of environments, is non-existent at this field site, which likely reflects the persistent lack of bio- and cryoturbation.  相似文献   

THETAPLOT,an equivalent potential temperature diagram     

G. Morgan 《Meteorology and Atmospheric Physics》1992,47(2-4):259-265

Summary THETAPLOT is a diagram useful for the display and analysis of atmospheric thermodynamic soundings, particularly in relation to conditionally and convectively instable summertime weather situations. The basic coordinates of THETAPLOT are the equivalent potential temperature and the negative logarithm of pressure. The body of the diagram contains families of curves of constant potential temperature, mixing ratio and temperature. From any given sounding, three curves are plotted on the diagram: 1) Theta-ed, the equivalent potential temperature of air saturated at its dew point temperature; 2) Theta-e, equivalent potential temperature; and 3) Theta-es, the saturated equivalent potential temperature. The winds are plotted along the margin of the diagram.With 5 Figures  相似文献   

ON ICE FORMING NUCLEI          下载免费PDF全文

J.Rosinski  P.L.Haagenson  C.T.Nngamoto  G.Morgan 《Acta Meteorologica Sinica》1991,(4)

Cloud condensation nuclei(CCN)constitute a reservoir of latent ice-forming nuclei(IFN)active by condensation-followed-by-freezing and by sorption.Two classes of aerosol particles active as IFN by sorption werefound.The first produces IFN concentrations which are dependent on temperature only.The IFN concen-tration consecutively increases with lowering of temperature and does not respond to the increasing partialwater vapor pressure.The second produces IFN concentrations which are dependent on partial water vaporpressure only,The IFN concentration consecutively decreases with decreasing of the partial water vapor pres-sure that takes place with the lowering temperature.Sulfates(mostly ammonium sulfate)constitute an integral part of IFN active by condensation-followed-by-freezing and by sorption.Backward isentropic air parcel trajectories linked polluted air rich in sulfates andclean air with high and low concentrations of IFN active by condensation-followed-by-freezing at-19.7℃ andS_w=0.1%.The experiments were performed in a dynamic filter processing chamber with aerosol particles collectedon membrane filters.  相似文献   

The Geopolitics of Deep Oceans John Hannigan. Polity,Cambridge, 2016, pp. xi + 185 (ISBN 978‐0‐7456‐8018‐7) (hbk) (ISBN 978‐0‐7456‐8019‐4) (pbk).          下载免费PDF全文

Rachael Squire 《Singapore journal of tropical geography》2016,37(2):273-275

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Cosmic ray exposure ages of features and events at the apollo landing sites     

R. Arvidson  G. Crozaz  R. J. Drozd  C. M. Hohenberg  C. J. Morgan 《Earth, Moon, and Planets》1975,13(1-3):259-276

Cosmic ray exposure ages of lunar samples have been used to date surface features related to impact cratering and downslope movement of material. Only when multiple samples related to a feature have the same rare gas exposure age, or when a single sample has the same⁸¹Kr-Kr and track exposure age can a feature be considered reliably dated. Because any single lunar sample is likely to have had a complex exposure history, assignment of ages to features based upon only one determination by any method should be avoided. Based on the above criteria, there are only five well-dated lunar features: Cone Crater (Apollo 14) 26 m.y., North Ray Crater (Apollo 16) 50 m.y., South Ray Crater (Apollo 16) 2 m.y., the emplacement of the Station 6 boulders (Apollo 17) 22 m.y., and the emplacement of the Station 7 boulder (Apollo 17) 28 m.y. Other features are tentatively dated or have limits set on their ages: Bench Crater (Apollo 12) ?99 m.y., Baby Ray Crater (Apollo 16) ?2 m.y., Shorty Crater (Apollo 17) ≈ 30 m.y., Camelot Crater (Apollo 17) ?140 m.y., the emplacement of the Station 2 boulder 1 (Apollo 17) 45–55 m.y., and the slide which generated the light mantle (Apollo 17) ?50 m.y.  相似文献   

The life history and sexual biology of Pseudunciola obliquua (crustacea: amphipoda) in the New York Bight     

M. A. Morgan  P. M. J. Woodhead 《Estuarine, Coastal and Shelf Science》1984,18(6):639-650

Pseudunciola obliquua is the most abundant subtidal amphipod of the near-shore macrobenthos in the New York Bight south of Fire Island. It has an annual life-cycle. Breeding occurs in March and April, and a single brood of between 8 and 20 eggs per female is produced. Fecundity is linearly proportional to maternal length. The eggs take about two months to develop; the juveniles emerge in June and July. Initial recruitment in the study area was estimated to be 2980 and 5850 per m² for the 1979–1980 and 1980–1981 year classes, respectively. Of the initial recruits only about 10% survive to form the reproductive stock of the following spring.Females and males grow at similar rates and are equally abundant as juveniles and initially as adults, until they reach sexual maturity. After breeding, the abundance of males decreases rapidly due to post-reproductive death. Females continue to live, carrying the developing eggs in their brood pouches. Mean female growth increases throughout the brooding period until the young are released, shortly after which adult females also die. The entire generation of reproductive adults has died by September.  相似文献   

Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks     

Morgan  M. Joanne; Brattey  John 《ICES Journal of Marine Science》2005,62(1):65-74

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Variation in the frequency of skipped spawning in Atlantic cod (Gadus morhua) off Newfoundland and Labrador     

Rideout  R.M.; Morgan  M.J.; Lilly  G.R. 《ICES Journal of Marine Science》2006,63(6):1101-1110

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