Abstract
Biomass dynamics were studied in isolated relict stands of Scots pine (Pinus sylvestris L.) on the dry steppe of Kazakhstan (53–54° N), where potential evaporation is 500–600 mm yr−1 and the rainfall is 250–260 mm yr−1. Samples were taken from seven plots in natural stands on sandy forest soils (aged 13–110 yrs) and ten plots in plantations on dark‐chestnut‐coloured soils (aged 5–50 yrs). Nine or ten sample trees were taken from each plot, giving a total of 68 and 96 sample trees in natural and plantation stands respectively. Root systems were excavated and fractionated in 11 plots. Analyses indicated that the stability of these stands becomes critical at 10–20 yrs, when foliage biomass reaches its maximum (7–13 t ha−1 dry weight), both in plantations and natural stands. Self‐regulating mechanisms in natural stands provide stability that may not develop in some plantations. Natural stands may show an abrupt decrease in foliage biomass at the time of canopy closure, but it increases again by age 40–50 yrs. In plantations this critical period may cause die‐back and may trigger stand collapse before maturity. Stem and root biomass increases monotonically and does not depend upon stand origin. The total biomass production is influenced by ground water level and the presence of and depth to the clay layer underlying the sandy sediments.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Pine stand stability became critical at 10–20 years as foliage biomass peaked.
PinusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stability of these stands becomes critical at 10–20 yrs, when foliage biomass reaches its maximum (7–13 t ha−1 dry weight), both in plantations and natural stands.”
t0“pine plantations”
Claim · model-written summary
Foliage biomass peaked at 7–13 t ha−1 dry weight.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliage biomass reaches its maximum (7–13 t ha−1 dry weight), both in plantations and natural stands.”
t0“pine plantations”
Claim · model-written summary
Natural stands may abruptly lose foliage biomass at canopy closure.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Natural stands may show an abrupt decrease in foliage biomass at the time of canopy closure”
t0“pine plantations”
Claim · model-written summary
Natural stand foliage biomass increases again by age 40–50 years.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but it increases again by age 40–50 yrs.”
t0“pine plantations”
Claim · model-written summary
Plantations may undergo die-back and collapse before maturity in the critical period.
- Outcome
- die‐back and may trigger stand collapse before maturitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plantations this critical period may cause die‐back and may trigger stand collapse before maturity.”
t0“pine plantations”
Claim · model-written summary
Stem biomass increases monotonically independent of stand origin.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem and root biomass increases monotonically and does not depend upon stand origin.”
t0“pine plantations”
Claim · model-written summary
Root biomass increases monotonically independent of stand origin.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem and root biomass increases monotonically and does not depend upon stand origin.”
t0“pine plantations”
Claim · model-written summary
Ground water level influences total biomass production.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total biomass production is influenced by ground water level and the presence of and depth to the clay layer underlying the sandy sediments.”
t0“pine plantations”
Claim · model-written summary
Clay-layer presence and depth influence total biomass production.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total biomass production is influenced by ground water level and the presence of and depth to the clay layer underlying the sandy sediments.”
t0“pine plantations”