Báo cáo lâm nghiệp:"High-grading effects on Scots pine volume and basal area in pure stands in northern Spain" pot
Báo cáo lâm nghiệp:"High-grading effects on Scots pine volume and basal area in pure stands in northern Spain" pot
... 11–18
© INRA, EDP Sciences, 2003
DOI: 10.1051/forest: 2002069
Original article
High-grading effects on Scots pine volume and basal area
in pure stands in northern Spain
Felipe Bravo
a
* and Gregorio ... Total and standing volume in a medium productivity (site index 20 m at 100 years), high-graded and non high-graded Scots pine
stands in northern S...
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...
in
relation
to
the
whole
plant
CO
2
exchange
and
ii)
the
relationships
between
alterations
in
carbon
allocation
and
in
osmoregulation
were
investigated.
MATERIALS
AND
METHODS
Plant ...
concentrations.
However,
elevated
CO
2
concentrations
often
lead
to
reduced
total
mineral
ion
concentrations
in
the
plant
tissues
(Conroy,
1992;
Overdieck,
1993)....
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for carbon assimilation in Scots pine.
5. CONCLUSIONS
Whereas temporal variation in needle
d
13
C depends on the
environmental changes during ... 71–78.
[20] Livingston N.J., Spittlehouse D.L., Carbon isotope fractionation in
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... alni subsp.
alni in the flooding and non-flooding condition was
Table 1. e effect of long-term flooding and Phytophthora alni infection on the development of black alder saplings
Treatment
per ... height (covariate), flooding,
P. alni and flooding × P. alni interaction on depend-
ing variables (increase in stem length, length of
leaves and biomass of leaves, roots and actin...
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... carbon isotope composition.
1. INTRODUCTION
Application of fertiliser often increases the growth of Pinus
pinaster Ait. and other conifers [24, 38]. The mass and area of
foliage increases following ... against any lasting role of A
max
in the growth
response. Concentrations of N, P, and K were maintained
within a relatively small range, and there was no correlation
between A
max...
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s
) and mesophyll conductance (G
m
),
and an increase in the proportion of electrons consumed in non-photosynthetic ... limited
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be inhibited due to the increased participation of competing
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... Eric-
sson and Ingestad [17] in birch seedlings. Conversely, under
low light, RGR was independent of plant P concentration
(Fig. 3). RGR did not increase with increasing plant P and no
relationship ... con-
ditions where the nutrient addition rate is controlled accurately.
2. MATERIALS AND METHODS
2.1. Plant material and growth conditions
Seeds of maritime pine (Pinus pinaster Aï...
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... crown dimensions, vertical and horizontal differentiation and foliage height diversity. Moderate
and heavy thinning have similar effects on stand structure, but the effects of light thinning are quite ... during
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... concentration neither in seedlings
nor in their components. Time or lifting effects on C:N in the
different seedling components were inversely related to those
in N concentration.
Total carbon ... mechanical handling disrupt the
functional continuity between soil and roots, and cause root
injuries with loss of fine roots, resulting in reduced water and
nutrient absorption...
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