Báo cáo lâm nghiệp: " Variation of the photosynthetic capaci

Báo cáo lâm nghiệp: " Variation of the photosynthetic capacity across a chronosequence of maritime pine correlates with needle phosphorus concentration" pptx

... explained by the higher values of photosynthetic capacity and intermediate level of stomatal conductance meas- ured in the trees of this stand. Leaf nitrogen concentration on an area basis appeared ... likely the main cause of the changes in photosynthetic capacity observed among maritime pine stands. Having acknowledged that the differential fertilisation of...

Ngày tải lên : 08/08/2014, 00:22

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Báo cáo lâm nghiệp: "Variation in the composition and content of ellagitannins in the heartwood of European oaks (Quercus robur and Q petraea). A comparison of two French forests and variation with heartwood age" ppt

... apparent and the data were log-transformed, resulting in more ho- mogeneous variances. A balanced, nested analysis of variance was used to compare the variation between and within ... Viriot et al (1994) calculated the concentration of ellagic acid at the sapwood/heartwood boundary as representing 10% of the total ellagitannins, with 1 %...

Ngày tải lên : 08/08/2014, 18:21

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Báo cáo lâm nghiệp:" Variation in the decay resistance and its relationship with other wood characteristics in old Scots pines" ppsx

... and within the radial sections. However, this small degree of variation explained to some extent the large variation in the heartwood mass loss. The uptake of water at the start of the malt agar ... between the inner and outer heartwood. The variation in the concentration of resin acids among the samples was large but, according to the regression analysis,...

Ngày tải lên : 08/08/2014, 01:21

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Báo cáo lâm nghiệp: "Variation in wood volatile compounds in a mixed oak stand: strong species and spatial diﬀerentiation in whisky-lactone content" pptx

... investigate relations between variables, Spearman rank-order correlation coeﬃcients, which are based on the ranks of the data rather than on the actual values, were used. 2.3.3. Spatial analysis We ... three ecological zones: a small valley, a plateau and a regular intermediate slope. The plateau is covered by a well drained soil and composed of sand and slit. The small...

Ngày tải lên : 07/08/2014, 16:20

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Báo cáo lâm nghiệp: "Variation of the tree form factor and taper in European larch of Polish provenances tested under conditions of the Beskid Sądecki mountain range (southern Poland)" docx

... purpose of this study was to estimate the provenance variation of the tree form factor and taper of European larch on the basis of empirical data acquired by measurements of dendrometric characteristics ... factors of various provenances became the basis of the estimation of provenance diversiﬁcation in respect of the stem form factor. e estimation...

Ngày tải lên : 07/08/2014, 10:22

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Báo cáo lâm nghiệp: "Variation of stomatal resistance with leaf age in Quercus petraea: effect on the soil-water balance of an oak forest" pot

... shows the strong decrease in stomatal resistance with leaf age, expressed as the ratio of actual leaf area to its maxi- mal area. All these values were obtained at high ... & Saugier B. (1989b) A model of transpiration and soil-water balance for a ma- ture oak forest. Agric. For. Meteorol. in press

Ngày tải lên : 09/08/2014, 04:20

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Báo cáo lâm nghiệp: "Changes in the mycorrhizal status of some mountain spruce forests" potx

... eliminated. Density of active mycorrhizae (AM, calculated as average values of spring – autumn) varied from 0.55 (Růžová hora 2006) to 1.39 (Růžová hora, Sněžka 2005), with the average of 1.0. 0.0 0.5 1.0 1.5 2.0 2.5 Rþžová horaȱ1994 Rþžová horaȱ2004 Rþžová horaȱ2005 Rþžová horaȱ2006 Sn»žka 1994 Sn»žka 2004 Sn»žka 2005 Sn»žka 2006 AMȱdensity spring ... irregularly in the soil a...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "Contribution to the knowledge of Clethrionomys glareolus populations in forests of managed landscape in Southern Moravia (Czech Republic)" pot

... oak and black locust (HA), and the third was a pheasantry with a variable mixture of forest stands of various woody species and age with a permanent supply of food for pheasants and roe deer ... is the most variable area of the three locations. It includes a number of miscellaneous woody species of various age categories as well as small open areas, such as...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "Contribution to the knowledge of Apodemus sylvaticus populations in forests of the managed landscape of southern Moravia (Czech Republic)" potx

... 370–376 responded by an increase in relative abundance in the next years 2004 and 2007. e peak of the popu- lation abundance was reached at the HA locality in 2002, which can be explained by the crop of seeds ... acerosum. e annual mean air temperature in the study area was 9.5°C; the total annual precipitation was 545 mm. In each locality under study, immediate mast sup...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "Changes in the abundance of Melolontha hippocastani" ppsx

... and 2007 imply that the swarming of M. hippocastani Fabr. adults began in the pe- riod when the average daily temperatures reached 12–13°C and that swarming culminated when the average daily ... and 100% of them were males. In the years of heavy swarming (2005 and 2008) we saw a diﬀerence between males and females in the time of swarming; the swarming of female...

Ngày tải lên : 07/08/2014, 10:21

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