Search results for "picea abies"
showing 10 items of 97 documents
A Specific Radioimmunoassay for the Determination of Low Quantities of Indole-3-acetic Acid in Spruce Needles of Healthy and Damaged Trees
1988
Summary The aim of the present investigation was to develop a radioimmunoassay for the quantification of indole-3-acetic acid in needles of Picea abies in damaged and phenotypically healthy trees. Phenols, lipophilic substances or compounds with cross-reactivity had to be separated from the extracts in several purification steps. Measurements were carried out between May and October 1986 on trees from two spruce plantations. Marked differences were found in IAA content in needles of healthy and damaged trees. In most cases the needles of the damaged trees contain lower endogenous IAA levels. The auxin levels also depended on the age of the tree, the year of needle formation, and the vegetat…
Preparation of extracts from mature spruce needles for enzymatic analyses
1987
It was possible to extract simultaneously several active enzymes involved in the carbohydrate or the amino acid metabolism from spruce needles [Picea abies (L.) Karst.] when a) a 100 mM Na-Pi buffer of pH 7.5 containing 5% PVPP and 0.5% Triton X-100 was used and when b) the resulting crude extracts were freed from lowmolecular-weight compounds by gel-chromatography using the separation medium Fractogel TSK HW-40. Besides Triton X-100, Triton X-305, Myrij-52 and Brij-35 were tested, but 0.5% Triton X-100 brought about the most active enzyme extracts. In crude extracts prepared from spruce needles during the early summer a high increase in absorbance at 334 nm was observed when the co-substra…
Studies on the Content of Free Amino Acids in Needles of Undamaged and Damaged Spruce Trees at a Natural Habitat
1990
Summary Measurements of the amino acids in needles of undamaged and damaged 90-year-old spruce trees ( Picea abies ) showed different patterns. During the summer months a reduction in total amino acid content of about 60 % was found. In autumn the content of total amino acids rose again. The courses of the single amino acids behave similarly to that of the total amino acids. Quantitatively, the main amino acids were GLU, ASP and GLN with about 37 %, 21 % and 10 %, respectively, followed by PRO, ALA and SER with about 3–4 % each. In the needles of healthy trees large variations in ARG content could be observed. These variations correlate neither with the damage degree of the trees nor with t…
Studies on the diurnal courses of the contents of abscisic acid, 1-aminocyclopropane carboxylic acid and its malonyl conjugate in needles of damaged …
1993
Summary The diurnal courses of the contents of 1-aminocyclopropane carboxylic acid (ACC), its malonyl conjugate (MACC) and abscisic acid (ABA) in the two-year-old needles of damaged and undamaged spruce trees (Picea abies L.) were investigated. The contents of ACC and MACC were significantly higher in the needles of the damaged trees as compared with the undamaged ones. In the needles of the damaged spruce trees, the ACC and MACC contents, and ABA contents as well, fluctuated to a greater extent than those in the undamaged spruce trees during the day. The relationships between ACC-ABA and MACC-ACC contents as well are also discussed.
Diagnosis of Damage to Norway Spruce (Picea Abies) through Ethylene and Other Biochemical Criteria
1998
Forest damage normally is characterized by loss and yellowing of leaves or needles. The results of this ocular damage diagnosis can be confirmed and stated more precisely through biochemical criteria, e.g. the plant hormone ethylene, the activity of the enzyme phosphoenolpyruvate-carboxylase (PEP-C), the content of chlorophyll and other biochemical parameters. Therefore we investigated the interrelation between visible damage and 13 biochemical parameters in six trees each from eleven permanent observed sites in the south-west of Germany. The results indicate that damaged trees can be separated clearly from undamaged trees by these biochemical criteria. Furthermore, statistical evaluation o…
Phenolic Compounds in Needles of Norway Spruce Trees in Relation to Novel Forest Decline. II. Studies on Trees from Two Sites in Middle Western Germa…
1994
Abstract The content of several phenolic compounds in needles of 20- to 30-year-old Norway spruce trees (Picea abies) was measured using HPLC. The results of two forestry sites in middle western Germany are reported in this paper. They are part of a research programme on novel forest decline which was carried out in various regions of Germany. Distinct amounts of picein, catechin, piceatannol glucoside, and other phenolic compounds were detected in the studied spruce needles. Additionally, their contents changed in relation to damage. Some compounds, especially catechin, showed increased levels in the needles of the damaged trees compared to the undamaged ones. Here, the values for the unda…
Created substrates do not fully mimic natural substrates in restoration: the occurrence of polypores on spruce logs
2014
Many protected areas have been under intensive forest management prior to protection and thus lack natural ecosystem structures and dynamics. Dead wood is a key structure in forests harboring hundreds of threatened species. We investigated the ecological success of dead wood creation as a boreal forest restoration measure. We analysed whether the polypore communities of chain-saw felled and girdled (subsequently fallen) Norway spruce ( (L.) H. Karst.) logs differ from naturally formed spruce logs of similar decay stage and size. The study was conducted in Leivonmäki National Park in central Finland 8 years after the restoration measures. The average number of polypore species was highest o…
Mežsaimniecības atkritumprodukta – skuju ekstraktvielas un to izmantošanas potenciāls bioekonomika
2021
Bakalaura darbā ”Mežsaimniecības atkritumprodukta- skuju ekstraktvielas un to izmantošanas potenciāls bioekonomikā” ietvaros tika apstrādāti 30 paraugi no parasto priežu (Pinus sylvestris L.) un parasto egļu ((Picea abies) skujām, ekstrahējot tos Soksletā dažādos šķīdinātājos, lai iegūtu ekstraktus, kurus turpmāk izmantoja bakalaura darba izstrādē. Darba teorētiskajā daļā tika apkopota zinātniska literatūra par priežu un egļu skujām un ķīmisko sastāvu, tā izmantošanas iespējām Latvijas tirgū un izmantošanu potenciālu bioekonomikas attīstībai. Pētījumā tika izmantota Folina-Šikoltē (Folin- Ciocalteu) un DPPH metode, lai noteiktu polifenolus un antiradikālo aktivitāti. Ekstraktu ķīmiskā sastā…
Klimata ietekmes uz gadskārtu blīvumu un platumu salīdzinājums parastajai eglei Picea abies (L.) Karst. un āra bērzam Betula pendula Roth
2017
Maģistra darbs „Klimata ietekmes uz gadskārtu blīvumu un platumu salīdzinājums parastajai eglei (Picea abies (L.) Karst.) un āra bērzam (Betula pendula Roth )” izstrādāts Latvijas Universitātes Ekoloģijas un Botānikas katedrā laika posmā no 2016. – 2017. gadam. Darba mērķis ir noskaidrot, vai gadskārtas blīvums precīzāk raksturos klimata saistību ar koka augšanu nekā gadskārtas platums. Pētījumā apskatīts parastās egles un āra bērza gadskārtas platuma un blīvuma saistība ar klimatiskajiem faktoriem. Gadskārtu paraugi ņemti no septiņiem parauglaukumiem, kas izkārtoti transektē pāri Latvijas teritorijai. Klimata dati iegūti no CRU TS 3.23 klimatisko datu kopu sistēmas. Gadskārtas platuma un b…
Macro Element Content in Fertilized Forest Soils in Spruce (Picea Abies (L.) H. Karst.) Stands in Latvia
2012
The present paper provides an overview of analysis conducted with soil samples from depths up to 80 cm, obtained in the Klive area from a spruce stand owned by JSC “Latvijas Valsts meži”. Also test fertilization attempts were made with the use of ash- and potassium-based artificial fertilizers (K2SO4). The content of macro elements (K, Ca, N, and C) was determined in the soil samples in the course of the analysis. The obtained results indicate that the content of K and Ca decreases at greater horizontal depths of the soil. Nutrients are subsequently being leached away from the soil. A higher C/N ratio at the horizontal depth of up to 10 cm in the soil means a higher content of organic subst…