AbSTRAcT:The study is a follow-up of the production potential of Douglas fir in mesotrophic sites of the Křtiny Training Forest Enterprise (TFE) (Journal of Forest Science, No. 7, 2008). Production parameters (height, dbh, volume) of Douglas fir are also evaluated, but in acid sites of the Hůrky Training Forest District, Secondary Forestry School in Písek in mature stands. In total, 17 mixed stands with the proportion of Douglas fir aged 88 to 121 years were assessed. Comparing 10 Douglas fir trees with 10 Norway spruce, Scots pine or European larch trees of the largest volume, higher and generally markedly higher production potential of the introduced Douglas fir was always found in all assessed stands. Groups where the volume of Douglas fir trees was two to three times higher than the volume of spruce, pine or larch were not an exception. For example, in stand 22B10, the mean volume of the 10 largest Douglas fir trees was 6.30 m 3 but the volume of spruce trees was only 1.93 m 3 and the volume of larch trees 2.25 m 3 . Differences between the mensurational parameters of Douglas fir and spruce (or larch) assessed by the ANOVA test were statistically highly significant. At present (based on annual ring analyses), the volume increment of particular Douglas fir trees ranges at level of 0.06 to 0.10 m 3 /year (i.e. about 0.6 m 3 to 1.0 m 3 per 10 years) in mature stands.

The aim of this study was to compare the degree of root rot damage in two large complexes of Norway spruce stands established on former agricultural land at fertile sites. The root rot infection was observed on the stump cutting area on both intended and salvage clear fellings. Stands in Kružberk area in the Nízký Jeseník Mts. established on arable land showed very poor stability and large root rot damage at the age of 40–50 years. In contrast, stands in Lužná area in the Javorníky Mts., founded on former sheep pastures, were markedly much less damaged at the age of 90–110 years and proved to be able to provide quality timber, although they were damaged by the root rot as well.

Ryan Cumbow). A "blue" Snow Goose was observed several times in the SW portion of the checklist area (for example at Booth Dam) in June 2010 or 201 1 (Ryan Cumbow pers. comm.). Alan Van Norman reported a Snow Goose in the Lyman County portion of the Fort Pierre National Grassland on 5 January 2013 (eBird database). ROSS'S GOOSE (Chen rossii) Status: Fairly common but irregular spring and fall migrant. Distribution: The distribution of the Ross's Goose is the same as the Snow Goose. High Counts: Approximately 40 Ross's Geese were with the hundreds of Snow Geese passing over the Cookstove Shelterbelt on 10 November 2014 (DNS). Remarks: Look for this species in large Bocks of Snow Geese. Peak migration periods for Ross's Geese are April and October/November. 17 CACKLING GOOSE (Brcinta hutchinsii) Status: Common but irregular spring and fall migrant, uncommon but irregular winter visitor. Distribution: Cackling Geese use cropland and wetland habitats. Remarks: Watch for this species in flocks of Canada Geese. Cackling Goose (Figure 16) migration peaks in April and October/November. Carey Cooper reported a relatively late Cackling Goose on 17 May 2014 in the Stanley County portion of the Fort Pierre National Grassland (eBird database). CANADA GOOSE (Brcinta canadensis) Status: Abundant spring and fall migrant, fairly common summer resident, abundant but irregular winter visitor. Distribution: Canada Geese use both cropland and wetlands. Nesting Records: Nests and broods are found annually within the checklist area. For example, a brood with 6 goslings was at South Lake Flat Dam on 12 July 2014 (DNS). Remarks: Local numbers swell with migrants from mid-March to late April, and again from October to early November. Early April to mid-August is the peak of breeding. Wintering flocks centered in Pierre are occasionally seen flying over or feeding in the checklist area. TRUMPTER SWAN (Cygnus buccinator) Status: Accidental fall migrant. Distribution: Trumpeter Swans use large reservoirs. Remarks: The only local record for this species pertains to two birds seen at Nels North Pasture on 16 October 2014 (Ryan Cumbow pers. comm.). TUNDRA SWAN (Cygnus columbianus) Status: Accidental fall migrant. Distribution: Trumpeter Swans use large reservoirs. Remarks: The only local record for this species pertains to a bird verified by Doug Backlund in County Line #14 on