Tree Core Sampling Techniques

The video tutorial explains the process of collecting tree cores for isotope sampling, emphasizing the need to sample at least six trees per species per location. It discusses sampling strategies across different landscape features and provides detailed instructions on the coring process, including the importance of coring at a tangent angle to avoid the heartwood. The tutorial also covers the quick processing of samples to minimize evaporative losses and improve water extraction.

Why is it important to sample at least six trees per species per location?

• To increase the chances of finding rare species

• To ensure a diverse genetic pool

• To reduce the cost of sampling

• To obtain a representative sample of the environment

What is one of the suggested sampling strategies mentioned in the video?

• Sampling only during the rainy season

• Sampling across a topographic transect

• Sampling trees in urban areas

• Sampling only at the valley bottom

Why should tree cores be sampled at or close to midday?

• Because the trees are less likely to be disturbed

• Because the trees are actively transpiring

• Because the sunlight is optimal for visibility

• Because the temperature is cooler

What is the reason for coring trees at a tangent angle?

• To avoid damaging the tree

• To ensure the core is straight

• To avoid coring into the heartwood

• To make the process faster

What should be done immediately after extracting the core?

• Store it in a cool place

• Process it quickly to minimize evaporative losses

• Measure its length and diameter

• Label it with the date and time

Why is it important to process the sample in an area protected by the wind?

• To reduce evaporative losses

• To prevent contamination from dust

• To keep the sample at a constant temperature

• To avoid disturbing wildlife

What tool is recommended for trimming the core into small discs?

• A chainsaw

• A handheld trimmer

• A scalpel

• A pair of scissors

What is the benefit of trimming the core into small discs?

• It increases the surface area for better water extraction

• It allows for easier identification of tree species

• It makes the sample easier to store

• It reduces the weight of the sample

What should be done immediately after trimming the core into small discs?

• Cap the sample and seal it with parafilm

• Leave them to dry in the sun

• Weigh them for accurate measurement

• Mix them with other samples

What is the purpose of sealing the sample vial with parafilm?

• To ensure no water is lost

• To make it easier to transport

• To prevent contamination

• To label the sample correctly