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Articles containing the keyword 'ravinnekierto'.

Category: Article

article id 4988, category Article
Irja Lehtonen. (1978). Ravinteiden kierto eräässä männikössä. Silva Fennica vol. 12 no. 1 article id 4988. https://doi.org/10.14214/sf.a14842
English title: Nutrient cycle in a Scots pine stand: IV The amount of phytomass and nutrients.

The distribution of the dry matter and nutrients in Scots pine (Pinus sylvestris L.) tree stock growing on a Vaccinium type site, ground vegetation, and humus were determined in the study. The greatest part of the dry matter in the tree was found in the stemwood. The living branches, roots, bark, needles and dead branches decreasing order of magnitude made up the rest of the biomass. The trees contained over 90%, the field layer vegetation 3% and the bottom layer vegetation 2% of the dry matter in the tree stand. The tree stock contained 86–95% of the total amount nutrients in the stand. The field layer vegetation contained less nutrients than the bottom layer vegetation. Nitrogen, however, was an exception, the amount being approximately the same in both vegetation layers. 

The PDF includes a summary in English.

  • Lehtonen, ORCID ID:E-mail:
article id 4975, category Article
Irja Lehtonen. (1977). Ravinteiden kierto eräässä männikössä. Silva Fennica vol. 11 no. 3 article id 4975. https://doi.org/10.14214/sf.a14826
English title: Nutrient cycle in a Scots pine stand. III Variation in nutrient content of soil, vegetation and precipitation.

The study is part of a project designed to elucidate the nutrient budget of a Scots pine (Pinus sylvestris L.) stand. Results of variation in the nutrient contents were compared with those obtained for the previous growing season.

The potassium and calcium contents varied the greatest in the humus layer. However, in the bottom and field layer vegetation and needles the variation in the nitrogen content was the greatest. The nutrient contents of the needles were affected by the physiological stage of development, needle age and the position in the crown of the tree. The nutrient content of the rainfall increased in the order: free rainfall, throughfall, and stem flow.

The PDF includes a summary in Finnish.

  • Lehtonen, ORCID ID:E-mail:
article id 4952, category Article
Irja Lehtonen, Seppo Kellomäki, Carl Johan Westman. (1976). Ravinteiden kierto eräässä männikössä. Silva Fennica vol. 10 no. 4 article id 4952. https://doi.org/10.14214/sf.a14798
English title: Nutrient cycle in a Scots pine stand. II. Amount and quality of precipitation in a Scots pine stand at the pole stage.

This study forms part of a project designed to elucidate the total nutrient budget of a Scots pine (Pinus sylvestris L.) stand in Central Finland during the 1974 growing period. Precipitation has been divided up into precipitation, throughfall and stemflow.

The acidity of the rainwater was found to increase in the order – Precipitation, throughfall and stemflow. The electrolyte content of the rain water from throughfall and stemflow was higher than that of precipitation. The nutrient contents of precipitation were rather low. Throughfall and stemflow were found to leach some nutrient from the trees. This was most clear in the case of potassium. The total amounts of nutrients reaching the ground in throughfall were found to be smaller than those in precipitation. On the other hand, the amounts of potassium, calcium and magnesium in stemflow were clearly greater than those in precipitation.

The PDF includes a summary in English.

  • Lehtonen, ORCID ID:E-mail:
  • Kellomäki, ORCID ID:E-mail:
  • Westman, ORCID ID:E-mail:
article id 4946, category Article
I. Lehtonen, S. Kellomäki, C. J. Westman. (1976). Ravinteiden kierto eräässä männikössä. Silva Fennica vol. 10 no. 3 article id 4946. https://doi.org/10.14214/sf.a14792
English title: Nutrient cycle in a Scots pine stand I. Seasonal variation in nutrient content of vegetation and soil.

The paper deals with variation in the nitrogen, phosphorus, potassium, calcium and magnesium content of vegetation and soil of young Scots pine (Pinus sylvestris L.) stand of Vaccinium site type situated in Central Finland. The material consists of sequential samples representing soil, ground vegetation and trees taken during summer 1974.

The amount of soluble nutrients in the humus layer decreased in June when maximum growth of trees and dwarf shrubs occurred. The nutrient content of this layer subsequently began to increase towards the end of the growing period.

The variation in the nutrient content of the bottom and ground layers followed a similar pattern. Nitrogen content increases at the beginning of the summer. After this phase it started to decrease and reached its lowest values by the end of growing period. Phosphorus and potassium content increased throughout the growing period.

The nutrient content of the needles and wood were positively correlated with tree height and negatively with the age of material. The highest values for the nutrient content were for new cells.

The PDF includes a summary in English.

  • Lehtonen, ORCID ID:E-mail:
  • Kellomäki, ORCID ID:E-mail:
  • Westman, ORCID ID:E-mail:

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