Does individual-tree biomass growth increase continuously with tree size?
نویسندگان
چکیده
Relationships between tree size and growth are sometimes assumed to show increasing with only until intermediate sizes reached, followed by a phase where rates decline further increases in size. However, this “rise-and-fall” pattern has been challenged studies suggesting continuously This study examined relationships diameter above-ground biomass (AGB) how such can differ depending on whether they represent an individual through time (longitudinal analyses) or the relationship was fit many trees within stand at single point (cross-sectional analyses). Using 949 long-term plots Switzerland (measured 1888 2014) including several species, sites management regimes, segmented regressions were used describe longitudinal cross-sectional stem AGB growth. The slopes of last segments analyses indicated that generally increased diameter. last-segment showed 12% had actually declined for decades. number 44%, when considering periods each tree, corresponding about 16 years contrast patterns results because declines occur different times individuals analyses), but is averaged out rarely evident from unless similar sizes. positively correlated light absorption light-use efficiency (AGB/light absorption). Interestingly, not absorption, change absorption. reiterates potential thinning delay onset declines. When all data combined (e.g. aggregated analysis), most strongly influenced diameter, relative height, neighbourhood basal area, climatic conditions, silviculture, lastly, species diversity. Cross-sectional often firstly, across may secondly, one time. doesn’t always increase highlights importance carefully which type analysis longitudinal) appropriate question being addressed.
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ژورنال
عنوان ژورنال: Forest Ecology and Management
سال: 2021
ISSN: ['0378-1127', '1872-7042']
DOI: https://doi.org/10.1016/j.foreco.2020.118717