Báo cáo lâm nghiệp: "Response of shoot growth and gas exchange of Picea abies clones to rain acidity and the addition of ions" ppt

... 728-733 Response of shoot growth and gas exchange of Picea abies clones to rain acidity and the addition of ions P. Van Elsacker I. Impens Department of Biology, University of Antwerp ... was to examine the effect of aci- dic wet deposition on C0 2 exchange, needle conductance and shoot growth of Norway spruce, particular...

Ngày tải lên: 09/08/2014, 04:20

... correlated, indicates that the growth conditions were similar throughout the branch life time, and supports the calculation of the bifurcation ratio as the slope of the shoot number vs. shoot age relationship ... demonstrating that the length of mother shoots controlled the branching less in the infertile site. The ratio of current needle to shoot axis...

Ngày tải lên: 08/08/2014, 01:21

... divided into three stages according to the grade of embryo differentiation: induction of embryogenesis, proliferation and maturation of so- matic embryos, and conversion of mature embryos into complete ... development. Despite of the successful protocol for the establishment of Norway spruce somatic embryogenesis technique, there is a lack of data concerning the...

Ngày tải lên: 07/08/2014, 10:21

... soil and the lowest (39 kg/ha) at the soil depth of 25–35 cm. Also in the beech stand, the maximum and minimum mortality was observed in the top 5 cm (254 kg/ha) and at the soil depth of 25 to ... 36.5 cm, age of about 80 years. Stocking of the stand was 0.8. Mean tree height of beech in the main canopy was ca 27.5 m, mean dbh 33.0 cm, age of nearly 90 y...

Ngày tải lên: 07/08/2014, 10:22

... stress was too large and possibly exceeded the capacity for detoxification and repair of the neoformed flush. The de- fensive capacity of these neoformed flush seems to collapse at the end of the season. ... from photorespiration or protein degra- dation constitutes the major source of N in the plant [27]. The high level of NR activity on days 31 and 57, togethe...

Ngày tải lên: 08/08/2014, 00:22

... causes of the decline of spruce stands in five selected regions of the Czech Republic – from FAVZ 2 to FAVZ 5 in nutrient-rich and acidic sites. With respect to the size of the pa- per and to the ... Radiměř), the second figure in the code (numeral) expresses the height of the aboveground part of the analyzed trees, the third figure in the code...

Ngày tải lên: 07/08/2014, 03:22

... defoliation of birch and the summer 17.8–12.6% loss of assimila- tory area (K, P 2007). Stands of birch differed under the effect of liming in the total loss of assimilatory area in the particular ... corresponded to changes in the fluctuation of species of e.g. the genus Phyllobius. Deviations in the extent of feeding in stands with the applica...

Ngày tải lên: 07/08/2014, 10:22

... from the canopy and by acceler- ated addition of relatively high-quality litter to the forest floor. Quantification of these fluxes should therefore lead to a better understanding of tree and stand ... measurements A series of permanent plots was used in this study to scale tree leaf area to the stand-level and to relate stand attributes to LAI and foliage lit...

Ngày tải lên: 07/08/2014, 16:20

... between the time of inventory and the starting year of calculations. Therefore, the general objective of this study is to test the predictive capacity of the historical records of defoliation to explain ... the number of years of moderate to severe defoliation, and b 1 to b i are the parameters to estimate. The names of the other variables ref...

Ngày tải lên: 08/08/2014, 00:21

... and (iii) the response to browsing of Q. ilex and Q. cerrioides will differ depending on the season of the year when browsing occurs. To test the first hypothesis, we undertook the monitoring of ... mortality of either Quercus species. None of the factors or their interactions affected the number of resprouts per stool (Tab. II). There was a significant effect of...

Ngày tải lên: 08/08/2014, 00:22