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The role of Mycorrhiza in the effects of warming on ecosystem carbon storage
Nordic natural heathlands are typically dominated by ericaceous dwarf shrubs, including the evergreen shrub crowberry (Empetrum hermaphroditum). The ecosystems dominated by Empetrum may be altered due to changes in environmental condition, such as global warming. It is to be hypothesized that the symbiosis between Empetrum and associated ericoid mycorrhizal fungi plays a key role in the competitiveness of this evergreen shrub during warming. Therefore, the overarching aim of this study is to examine the exchange of carbon and nutrients in plant-mycorrhizal networks under changing temperature.
Skogskompetens Syd
PI: Martin Ahlström
Skogskompetens Syd — samverkan mellan forskning och praktik i det sydsvenska skogsbruket. Syftet är samordning och kunskapsförmedling av fortbildningsaktiviteter inom skogsskötselområdet mellan SLU, skogsföretag, skogsstyrelsen, skogsentreprenörer, skogsbruksskolor och stift i södra Sverige.
Carbon balance of managed and unmanaged boreal forest
PI: Jenny Dahl
The aim of this project is to investigate harvesting effects on soil carbon stock in old-growth boreal forests in north-west Sweden. Soil carbon stock is quantified in the humus layer and down to 50 cm in the mineral soil at 23 sites of adjacent old-growth and younger stands in northern Sweden. Carbon stock in above ground biomass is also quantified. Other components measured or assessed are site index, bulk density and stoniness.
Carbon balanceold-growth forestharvesting effectssoil carbon
Ozonmätning Asa
PI: Mikael Andersson
Mätningarna i Asa ingår i Naturvårdsverkets nationella övervakning av luftkvaliten.
Experimental channels
PI: Lenka Kuglerova
In August 2020 a set of 12 artificial streams was built at Svartberget. The channels are 15 m long and 20 cm wide and are fed with water from the near-by C8 stream. The water is pumped into a 3000 l collection tank to sustain a constant flow (can vary between 0 and 1 l/s in each channel) by using an electric pump. The channels are designed in four triplets, each triplet is fed from a 1000 l manipulation tank and thus 4 levels of water treatments with 3 replicates each can be achieved. The slope of the channels can vary between 0 and 1.5 degrees and temperature can be manipulated due to a local electricity source. The bottom of the channels is covered by gravel and pebbles but can be manipulated (e.g., sand or organic layer aditions). The channels spills out to a forest floor, ensuring filtering water before reaching the C8 stream again. The channels are constructed to last at least 10 years, possibly longer.
Partiklar i bakgrundsluft i Asa (F465)
PI: Mikael Andersson
Mätningar av partikelhalter (PM10 och PM2,5) i regional bakgrund.
Krondroppsnätet Jönköpingss län (F450 LUFS)
PI: Mikael Andersson
Insamling av krondropps och markvatten från 4 lokaler.
Krondroppsnätet Kronobergs län (F450 LUFS)
PI: Mikael Andersson
Insamling av krondroppsvatten och markvatten från fyra lokaler.
10426 Rievikkövaara, 10428 and 10429 Huhtakusivaara
PI: Ulla Nylander
Data from tree measurements v. 38 2003. Fertilisation experiment with 3 blocks (thinned pine, mixed forest stand, contorta). Collaboration SLU-Sveaskog.
1532-1537 Inverted soil scarification experiment
PI: Ulla Nylander
Data from tree measurements 2011 from inverted soil scarification experiment. 1532-1537 are 6 blocks of 12 located nationwide in Sweden. Measurements for Professor Urban Nilsson, SLU Alnarp.
Method development for d18O analysis of phloem content.
The isotope ratio of the sugars in the phloem sap of a tree directly represent the fractionation during photosynthesis (Anet) and stomatal conductance (gs) and integrate the signal from the whole canopy. d13C of phloem content has been repeatedly used to estimate canopy water-use efficiency, i.e. Anet/gs. The simultaneous analysis of d18O and d13C would enable us to evaluate if differences in d13C are due to changes in photosynthetic capacity or in stomatal conductance (gs). This method has the potential to be used as an indicator of growth and survival under various environmental conditions, for example in response to changes in ambient temperature and water availability. Such a diagnostic tool could be useful in predictions of forest growth, changes in species composition under future climates or to screen for more resilient genotypes in forestry species. However, the analysis of d18O in phloem sugars is problematic. If sucrose breaks down during the extraction, the molecules exchange oxygen with the extraction medium, altering so the d18O of the sugars. In this project I propose to develop an optimised method for sampling and extraction of phloem content for oxygen isotope analysis, considering a set of extraction conditions, extraction time, sample preparation methods and sampling position along the stem. I will use phloem samples from mature Scots pine trees during the optimisation of the extraction method and finally compare Scots pine, Norway spruce and Silver birch when assessing the importance of the vertical sampling position along the stem. The method development will be executed in close collaboration with Jonas Lundholm at the SLU Stable Isotope Laboratory, who is an expert in analytical chemistry and oxygen isotope analysis. The field work will be done with the assistance from the staff at the Svartberget field station.