MANUAL Part II Visual Assessment of Crown Condition - ICP Forests

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24 II. CROWN CONDITION ASSESSMENTS 0 5 10 40 30 20 50 60 70 99 90 80 Figure A1-2: Guide to estimating transparency (derived from Tallent-Halsell 1994). updated 06/2006
II. CROWN CONDITION ASSESSMENTS 25 Figure A1-3: Crown outline to be taken into account when estimating foliage transparency. Note the areas to be excluded from the estimates. This is a free standing tree, therefore the assessable crown covers a rather large area (derived from Tallent-Hassel 1994). A1.20 Flowering (optional Level II) Definition This score is defined as the estimation of (current) flowering in the crown. Flowering is important for two reasons. Firstly, it can affect the defoliation score in the assessable part of the crown, both in the year of flowering and subsequently. Secondly, flowering in the whole crown is of interest because of the effects that it has on the carbon balance of the tree – energy used for flowering cannot be used for increment. Methods Two assessments are made: of the assessable part of the crown and of the whole crown. Scoring is: 1 Absent or scarce. The flowers are not seen in a cursory examination. 2 Common. Flowering effect is clearly visible. 3 Abundant. Flowering dominates the appearance of the tree. Hint: in some species, such as Pinus and Larix, the flowers will probably have been dropped by the time of assessment. Scoring is based on the gaps along the shoots where the flowers formerly were. updated 06/2006
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MANUAL Part II Visual Assessment of Crown Condition - ICP Forests

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