Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx

... 14-04-1999. The vertical and horizontal lines in the graph represent the threshold values for the accumulation of the indicated secondary vascular cell types. For periclinal divisions in the cambium, and ... estimated in the two direc- tions. In the first case, fusiform cells were counted along the radial files in the xylem portion of the cambiu...

Ngày tải lên: 08/08/2014, 00:22

... height of insert point of the highest branch and the height of insert point of the branch of interest). In every annual shoot of the stem, the branches were ordered from the top to the base according ... hr is the calculated height of insert point of the branch to the pith, hm is the measured height of insert point of the branch to the trunk,...

Ngày tải lên: 07/08/2014, 16:21

... within the shaded area (Jianghua Sun, 2004, unpublished data). 126 A.J. Carnegie et al. There are large areas of forests of P. massoniana in the south-east of China and of Larix gmelinii in the ... plantations in these regions is inev- itable. The continued use of the Sirex Management Strategy [16] will reduce the economic impact of this pest in these coun- t...

Ngày tải lên: 08/08/2014, 00:22

... different thermal chocks and control situation. Control 50ºC 75ºC 100ºC 125ºC 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min Halimium ... from the boreal region in northern and eastern areas to the Mediterranean mountains in the south- ern part of the continent. An accurate assessment of the regen- eration process...

Ngày tải lên: 08/08/2014, 01:21

... disease of unknown cause in the recent past, and phenotypic characteristics such as stem form and branching habit are often inferior in plantations. The origin of D. sissoo plantations in Nepal ... described by Weising and Gardner [14] using their universal primers ccmp-6, ccmp-7, and ccmp-10. The preparation of the PCR-mix and the sepa- ration and visualizat...

Ngày tải lên: 08/08/2014, 01:22

... Concerning thinning characteristics, the time since last thin- ning τ and the thinning intensity I were retained for this study. Thin- ning intensity I is defined in terms of basal area, being ... since thinning increased (data not shown). Thus the influences of stand age, time since last thinning and intensity of last thinning on extinction coefficient b (relation- ship...

Ngày tải lên: 08/08/2014, 01:22

... end of April to the end of October and emptied in two-week or one month intervals during the period 2001–2006. e sawflies were determined according to the key of V (2002) and the ... liv- ing on spruce in mountainous regions and (ii) to compare species composition and abundances of these species in cultural and near-natural spruce forests. MATERIA...

Ngày tải lên: 07/08/2014, 03:22

... well known as a means of increasing the precision of estimates in unstratified sampling by incorporating additional information about strata weights in the final estimator. In gen- eral, stratification ... stratification, the variance of the poststratification estimator is increased by the randomness of the sample size in each stratum. If poststratification is combi...

Ngày tải lên: 07/08/2014, 03:22

... in an initial stage and the soil structure is still instable. Furthermore, there is no groundwater in uence due to the lower- ing of the groundwater level because of the ongoing mining activities. ... Supported by the Federal Ministry of Food, Agriculture and Consumer Protection and by the Vattenfall Europe Min- ing AG. Assessing the short rotation woody biomas...

Ngày tải lên: 07/08/2014, 10:21

... for the estimated age. The distribution of the age of the dominant strata and the site index within the for- est area can be seen in Figure 4. The classification of the forest area in function of ... samplesu a and u a + d. The experimental variogram and fitted model for the site index and age of the stand are shown in Figure 3. The ordinary...

Ngày tải lên: 07/08/2014, 16:20