@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix gsp: <http://www.opengis.net/ont/geosparql#> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/18fd5a55-bc2a-4b02-bb36-d6f700cf12d0> a dcat:Dataset ;
    dct:description "The data set describes post thinning stand conditions of western Oregon Douglas-fir/western hemlock forests ranging in age from 40-70 years old at the time of thinning. Stand characteristics monitored included overstory stand structure and species composition, natural conifer and hardwood tree regeneration and development, species composition and percent cover of understory vascular plants, and the status and recruitment of large and small logs (woody debris) and snags. The Density Management Study was designed to investigate whether thinning to various densities can accelerate development of late-successional characteristics in young, managed Douglas-fir (Pseudotsuga menziesii) forests (40-70 yrs) while producing wood for the regional economy. The DMS consists of two components: initial thinning treatments (7 sites) and re-thinning treatments (4 sites). These 12 DMS sites are located in the Coast Range and Cascade Foothills of western Oregon. The re-thinning study was installed in 60 to 70-year old stands that were commercially thinned previously. Treatments included a control (once thinned) and a re-thinning treatment to 12-24 trees per hectare (or 30-60 trees per acre), allowing for a clumped distribution. Four treatments implemented at each initial thinning site include an uncut control and units containing one of three levels of residual tree density (high, moderate, and variable density) with circular patch cuts and leave islands of three sizes (0.1, 0.2 and 0.4 hectares or 0.25, 0.5 and 1 acres). The patch cuts and leave islands represent a relatively small proportion of the overall treatment at each site (10% of the treated stand is patch cuts and 10% is leave islands). The initial thinning and rethinning treatments were implemented by thinning from below and by retaining hardwood tree species and minority conifer species. We investigate responses of understory and overstory vegetation to treatments initially after harvest and through time at five year increments following harvests. In addition, we evaluate the relative influence of patch cuts and leave islands on understory vegetation response within initial thinning treatments." ;
    dct:identifier "18fd5a55-bc2a-4b02-bb36-d6f700cf12d0" ;
    dct:issued "2025-11-20T05:29:19.599803"^^xsd:dateTime ;
    dct:modified "2025-11-20T05:29:19.599807"^^xsd:dateTime ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:spatial [ a dct:Location ;
            locn:geometry "POLYGON ((-124.6000 42.0000, -121.5000 42.0000, -121.5000 46.2500, -124.6000 46.2500, -124.6000 42.0000))"^^gsp:wktLiteral ] ;
    dct:title "OS - Vegetation data for the Density Management study of western Oregon-new" ;
    dcat:keyword "adaptive-management",
        "amerigeo",
        "amerigeoss",
        "bureau-of-land-management",
        "cascade-mountains",
        "ckan",
        "coast-range",
        "density-management",
        "femat",
        "geo",
        "geoss",
        "late-successional-habitat",
        "leave-islands",
        "national",
        "none",
        "north-america",
        "oregon",
        "overstory",
        "patch-cuts",
        "public-lands",
        "thinning",
        "understory-vegetation",
        "united-states",
        "western-oregon" .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .