Abstract
Replicated plots in a 15-year-old plantation of radiata pine (Pinus radiata D. Don) of basal area approximately 40 m 2 /ha were thinned from below to approximately 11, 18, 23, and 28 m'-/ha respectively. The plots were re-thinned periodically thereafter to these same basal areas; one replicate of plots was retained relatively unthinned. Regression equations relating needle dry weight to branch cross-sectional area were developed and used to examine the distribu tion of foliage of various ages within the crowns. In the upper crown (70-80% height decile and above), the percentage of 1-year foliage increased acropetally from 52 to 75% whereas that of 2-year and 3-year and older foliage decreased slightly (28 to 22%) and markedly (20 to 3%) respectively. In the middle and lower crown, i.e., all deciles below the 70-80% decile, the distribution of foliage across age classes was approximately constant at 37% (1-year), 28% (2-year), and 36% (3-year and older). The combined biomass of 1- and 2-year leaves within the whole crown averaged 73% of total leaf biomass under all thinning regimes. Though stand density had little effect on proportionate distribution of foliage by position in the crown or leaf age, the total amounts of foliage varied greatly. Total foliage biomass ranged from 4.9 to 11.3 tonnes/ha and annual foliage production from 2.4 to 4.3 tonnes/ha in stands of mean stand density ranging from 15m 2 /ha (biomass) or 21 m 2 /ha (annual production) to 46 m 2 /ha.
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Claims 8
Claim · model-written summary
In the upper crown, one-year foliage increased acropetally from 52 to 75%.
Verbatim
e0“the percentage of 1-year foliage increased acropetally from 52 to 75%”
t0“RADIATA PINE”
Claim · model-written summary
Upper-crown two-year foliage decreased slightly from 28 to 22%.
Verbatim
e0“that of 2-year and 3-year and older foliage decreased slightly (28 to 22%) and markedly (20 to 3%) respectively”
t0“RADIATA PINE”
Claim · model-written summary
Upper-crown three-year-and-older foliage decreased markedly from 20 to 3%.
Verbatim
e0“that of 2-year and 3-year and older foliage decreased slightly (28 to 22%) and markedly (20 to 3%) respectively”
t0“RADIATA PINE”
Claim · model-written summary
Middle and lower crown foliage proportions were about 37%, 28% and 36% for one-, two- and older leaves.
Verbatim
e0“the distribution of foliage across age classes was approximately constant at 37% (1-year), 28% (2-year), and 36% (3-year and older)”
t0“RADIATA PINE”
Claim · model-written summary
One- and two-year leaves averaged 73% of total crown leaf biomass across thinning regimes.
Verbatim
e0“The combined biomass of 1- and 2-year leaves within the whole crown averaged 73% of total leaf biomass under all thinning regimes”
t0“RADIATA PINE”
Claim · model-written summary
Stand density had little effect on foliage proportion by crown position or age.
- Taxon
- radiata pinet0
- Treatment
- stand densitye0
- Outcome
- proportionate distribution of foliage by position in the crown or leaf agee0
- Direction
- little effecte0
Not reportedComparator
Verbatim
e0“stand density had little effect on proportionate distribution of foliage by position in the crown or leaf age”
t0“RADIATA PINE”
Claim · model-written summary
Foliage biomass ranged from 4.9 to 11.3 tonnes/ha over the observed stand densities.
Verbatim
e0“Total foliage biomass ranged from 4.9 to 11.3 tonnes/ha”
t0“RADIATA PINE”
Claim · model-written summary
Annual foliage production ranged from 2.4 to 4.3 tonnes/ha.
Verbatim
e0“annual foliage production from 2.4 to 4.3 tonnes/ha”
t0“RADIATA PINE”