Item request has been placed! ×
Item request cannot be made. ×
loading  Processing Request

Puistute kõrguskasvu muutuse hindamine. (Estonian)

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
Read Online Read More Add to Saved list
  • Additional Information
    • Alternate Title:
      Estimation of change in forest height growth. (English)
    • Abstract:
      Forest height increment rate is related to the forest growth conditions. Data bases of previous forest inventories contain information about forest heightage relationship on large number of forest stands while repeated measurements of permanent sample plots provide an excellent reference for comparison. Repeated airborne laser scanning of forest stands is an additional source for the estimation of change in forest structure. In this study, height growth of middle-aged and older forest stands for about 10 year period was compared to an algebraic difference model on permanent sample plots (66) and for a sample of forest stands with repeated airborne laser scanning data (61). The model was based on a large dataset of forest inventory records from the period of 1984-1993. Statistically significant increased forest height growth was found in permanent sample plots based on tree height measurements (9 cm yr-1) as well in stands with repeated laser scanning data (4.5 cm yr-1) in South- East Estonia compared to the algebraic difference model. The difference between the two data sets was explained by their mean age and site class, but the increased forest height growth compared to the old forest inventory data indicates improved growth conditions of forests in the test area. The results hint also that empirical data-based forest growth models need to be updated to avoid biased growth estimates. [ABSTRACT FROM AUTHOR]
    • Abstract:
      Copyright of Forestry Studies / Metsanduslikud Uurimused is the property of Sciendo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)