1. |
|
|
2. |
|
|
3. |
|
|
4. |
|
|
5. |
|
|
6. |
|
|
7. |
- Sahlander, Gisela
(author)
-
Ny E4 Enånger- Hudiksvall Naturinventering : Biologisk konskvensbeskrivning
- 1994
-
Reports (other academic/artistic)abstract
- Detta arbete är en naturinventering av planerade sträckningen av den planerade sträckningen av ny E4 mellan Enånger och Hudiksvall och kommer att ingå som en del av en miljökonsekvensbeskrivning (MKB) av området. Jag har av vägverket fått i uppdrag at undersöka tre alternativ för vägens sträckning: A, B och D. Denna undersökning har tre syften: TT bedöma de tänkta vägsträckningarnas inverkan på naturen i området, att visa Vägverket vilket alternativ som till sist kommer till utförande.Generellt bedömer jag att den landskapstyp som de föreslagna vägsträckningarna berör är vanligt förekommande i trakten. Alternativ B har jag förkastat då det skulle medföra att en biologisk intressant gransumpskog skulle ödeläggas. De två övriga alternativ är lika varandra vid första påseendet. Längs båda sträckningarna finns det värdefulla naturtyper. Vid en granskning fann jag dock att det längs vägsträcka A finns fler ”fasta” naturtyper, såsom bäckraviner, myrmarker, åkanter och hällmarker, d.v.s bestående strukturer i naturen. Dessa ” fasta” naturtyper skulle komma att förstöras av en ny väg. Slutsatsen blir att jag förordar alternativ D som ny E4 mellan Enånger och Hudiksvall. När det gäller valet av vägtyp tror jag att det inte har någon större betydelse för naturen vare sig det blir en motorväg eller en motortrafikled.
|
|
8. |
|
|
9. |
- Kruys, Nicolas, et al.
(author)
-
Fine woody debris is important for species richness on logs in managed boreal spruce forests of northern Sweden
- 1999
-
In: Canadian Journal of Forest Research. - 0045-5067 .- 1208-6037. ; 29:8, s. 1295-1299
-
Journal article (peer-reviewed)abstract
- Species richness of wood-inhabiting cryptogams was compared on fine woody debris (FWD; diameter 5-9 cm) and coarse woody debris (CWD; diameter 10 cm) logs of Picea abies (L.) Karst. Data were collected from managed boreal forests of northern Sweden. Species richness was higher on CWD than FWD when equal numbers of logs were compared. When equal surface areas were compared, species richness on FWD and CWD did not differ. When equal volumes of CWD and FWD were compared, FWD had more species. This was an effect of surface area and log quantity, as a certain volume of FWD was composed of more logs and had greater surface area than the same volume of CWD. We varied woody debris volume and proportion of FWD in a simulation model of species richness on logs. At low volumes of woody debris, species richness increased with the proportion of FWD. At higher log volumes, species richness increased with the proportion of CWD. In managed forests where there are small amounts of woody debris, FWD is important for the total species richness on logs and should not be neglected despite the fact that species richness is generally positively correlated with log diameter.
|
|
10. |
- Kruys, Nicholas, et al.
(author)
-
Wood-inhabiting cryptogams on dead Norway spruce (Picea abies) trees in managed Swedish boreal forests
- 1999
-
In: Canadian Journal of Forest Research. - 0045-5067. ; 29:2, s. 178-186
-
Journal article (peer-reviewed)abstract
- We surveyed the quantity and quality of dead Norway spruce (Picea abies (L.) Karst.) trees and wood-inhabiting cryptogams in a managed boreal forest landscape in northern Sweden. Size and decay of dead trees was related to substrate utilization by wood-inhabiting species. Coarse woody debris (CWD) was surveyed along 34 strip transects. CWD and wood-inhabiting cryptogams were surveyed in eight circular plots at each site. A total of 6195 spruce CWD units occurred along strip transects and 809 spruce CWD units in circular plots. On average 2.2 m3/ha spruce CWD was found on the plots. The majority (63%) of the transect CWD units were <10 cm diameter and in early to intermediate decay stages. Sixty-eight wood-specific species of fungi, lichens, mosses, and hepatics occurred on the plots. Of these, 13 occurred on 5% of the 809 CWD units surveyed for wood-inhabiting species. Eight species occur on the Swedish red lists, indicating that such species are indeed uncommon in managed forests. Red-listed species showed strong preferences for large diameter CWD and CWD in late decay stages, i.e., substrates that are poorly represented in managed forests. Frequently occurring species, however, showed utilization patterns that correspond with the distribution of the substrate types.
|
|