Dendroecology - Science topic

Hello everyone,

while studding the dendroclimatological relationship between annual rings and precipitation. I need to standardize the annual rings using a computer program. what are the programs you suggest, and if possible been easy to practice or the program had been explained on some internet platform (Youtube, website, blogger, ..... etc).

best regards,

Hello together!

I have some time-series for tree-rings from dating from 1850-2016 and diameter at breast height (DBH) from 1996-2022 for the same plot, however the sampled trees for tree-rings and DBH do not overlap. I want to build 1 time-series (in basal area increments e.g.) for the whole plot, so at stand level, covering the complete time-span from 1850-2022. Is this possible to do, did anyone of you do this before?

Best

Alexander

We are measuring growth rings in softwoods and we would like to know how to evaluate the false growth rings

I am looking for some kind of standarisation for determining ring curvature radius for archaeological deciduous Quercus (cf cerris). I have used the the "trigonometry in an isosceles triangle" after Paradis (2007) and Paradis et al. (2011) to calculate the radius of curvature but this results in literally thousands of unique measurements. I was wondering if there is a standard for grouping radius curvature dimensions together (into bins) for statistical comparison. For example: fragments with a radius of 0-50 mm are considered strongly curved and those with a radius between 50.1-100 mm are moderately curved etc. Given that Quercus cerris grows to a diameter of up to 2 m what is considered weakly curved? This may well be available in the French literature but as I cannot translate from French to English any assistance would be appreciated. 

I am interested in the characteristics of Pinus (especially nigra and sylvestris but not limited) as related to behavioral ecology. The characteristics that I am looking for include calorific value, volume (density-dependent), weight (density-independent), durability, and if possible the brightness of the burn.

These data will be used in human behavioral ecology models to see if they explain why Pinus was used as a fuel (cooking, heating, and lighting) in Bronze and Iron Age Anatolia. If anyone can provide any direction or references I would be most grateful.

Dear all,

I want to identify tree water sources in selected trees over an entire growing season, preferably monitoring the same trees. As I will not have access to suberized branches in most cases, I'm considering to take multiple cores from a single trunk (up to 5 times). Unfortunately, this method is rather intrusive, and hence I'd like to use the smallest borer diameter possible to allow extraction (via cryogenic vacuum distillation) of an adequate amount of sap water, while keeping damage at a minimum.

I'd appreciate any comments on or experience with repeated trunk sampling (effects on sap flow, mortality) and which borer and coring depths can lead to adequate results.

Thanks in advance.

Kindest regards,

Alex

Is there someone that have used Tetraclinis articulata in dendrochronological analysis?

I have some samples from Morocco

For some species like Fagus orientalis or Quercus spp, is it very easy to spot the borders of sapwood and do the measurements. But for some species, the sapwood area is not visually recognizable. Do you have any suggestion for measuring the sapwood area of Carpinus betulus using the standard instruments? I should mention that we don't have high tech instruments like x-ray or tomography.

I'm working on cores from Juglans regia (common walnut) and sometimes I see very narrow rings (ex: 0,3 mm against normal mean of 4-5 mm). My cores looks as semi-ring-porous or diffuse porous. Is there someone that have more experience on this kind of wood and that could suggest me some key to detect possible false (double) rings?

I would like to calculate the annual carbon fixed in a forest from my tree-rings measurements. But I don't know how close is the correlation between the radial growth and height growth. Can the allometric models calculate it?

My idea is to know how much carbon can be stored year per year in a tropical forest in different tree species. With the ring-with data I can calculate how the basal area is increasing year per year. But to calculate the volume I need the annual heigh too, since it is changing with the tree age. It is to understand the carbon storage over the history of a forest ecosystem, considering the differences between tree species.

I will be very grateful with some clue or idea to continue with this research.

Thanks

I am working with estimating tree size (dbh) and density from small sample plots using photos. I was hoping to get some feedback on sampling design and the number of plots I need to do within a given stand of trees. Namely the type of survey (clustered or probability proportional to size) and whether I should be focused on sampling a certain amount of area, or a certain number of trees. Density estimates are the primary information I require but if I could get good data on the varying size classes of trees, that would be good too. Should I set thresholds in the photo set to only measure trees within a certain distance from the camera (so that my sample size is fixed) or count and measure a certain number of trees in the sample irrespective of distance from the camera (irregular plot size, but still able to be calculated)? Once this is defined, how many samples should I do per hectare? In my test samples I get 15-20 trees per sample but am willing to amend the way the photo sets are taken to get fixed areas, or varying numbers of trees.

Ultimately I would like to compare these measurements to other contemporary methods of measurement but realise this would require a different statistical approach.

I am weak in stats so very simple explanations or references with examples would be preferred.

Sal mortality is occurring in central Indian forest with die back and complete death of sal trees in patches. We surveyed the mortality area and from pathological point of view no any particular pathogen was uniformly associated with dead trees. Only in some moist forest areas fruit bodies of Polyporus (Innotus) shoreae was found attached with roots of top dying trees. Two species of Hypoxylon were also recorded from dead and partially dead trees 

Does anybody have any idea for the cause of sal mortality?

In tehran we have different varities of shrubs and trees, among them I would like to know which of them is the faster growing in equal situations?