Báo cáo lâm nghiệp: "Modelling the demographic sustainability of pure beech plenter forests in Eastern Germany" pot

... view of practitioners in the beech plenter forest in Thuringia [9, 12–15]. They all considered a standing volume of about 250 m 3 /ha to be the upper limit to maintain the plenter system in these ... much higher in beech forests than in conifer-dominated ones. It also explains why there has been little or no success in the past when applying the principles...

Ngày tải lên: 08/08/2014, 00:22

... according to the following algorithm: from the begin- ning of tree growth, we have in the law (4) for every GU, i.e. the stem cannot react; during cycles of growth, if the leaning angle of one ... direction of the bearing element. The secondary straightening up is induced by a differential of mat- uration strains in the plane of flexion which is due to the pr...

Ngày tải lên: 08/08/2014, 01:22

... radiata pine plantations 613 identical for all the measurements belonging to the same unthinned growth period within a single plot, hereafter the individual being in- vestigated. During the fitting ... for Pinus pinaster stands in Galicia. In summary, taking into account the adequate graphs pro- vided by model BA2 (Fig. 1) as well as the values of the goodness -of- fit sta...

Ngày tải lên: 07/08/2014, 16:21

... at the beginning of the win- ter. Then, it estimates the influence of frost on the survival of the pathogen present in those lesions. For this, the model estimates the ... during winter and recolonisation of the lower trunk during the growing sea- son. During the period 1985-1987, the model predicted a lower survival of P cin-...

Ngày tải lên: 08/08/2014, 18:21

... growing evidence about the influence of water deficits on the develop- ment of insect or pathogen problems that eventually result in a general decline of these forests. Therefore, ... leaves were generally inclined towards the ground, whereas in the coppice they were pointing upwards. The information about canopy structure and the response...

Ngày tải lên: 09/08/2014, 04:20

... (without the ending and often extended hairs), metatarsal length (LTp) from the calcaneal joint to the tip of the hoof, ear length (LA) from the root of the ear to the tip, and height at the withers ... suggest the opinion, that in Doupov region can absent the dominate female. But on the other side, many of sudies describe the absence of adult male as m...

Ngày tải lên: 07/08/2014, 10:21

... 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 ... calculate the insert height of the branches to the pith level. hr is the calculated insert position of the branches to the pith level: hm is the...

Ngày tải lên: 07/08/2014, 16:21

... any of the soil chemical properties in- vestigated in the organic layer or the mineral soil (Tabs. IV and V). The accumulation of N in the organic layer was highly dependent on Al ex in the mineral ... saturation in the mineral soil are key factors for the accumulation of C and N in the organic layer. The total pool of phosphorus was particularly large...

Ngày tải lên: 08/08/2014, 00:22

... slow increase from the beginning of the 20th century. Between 1910 and 2001, ring-width has increased of about 50%. The growth pattern of the sampled trees was in agreement with the stand growing ... variability of the estimates. The subsampling is done by random extraction with replacement from the initial data set. The size of each subsample is the same as th...

Ngày tải lên: 08/08/2014, 01:21

... demonstrated that flooding greatly increased the production of 1-amino-cyclopropane-1-carboxylic acid (ACC) in the roots and ethylene in the shoots of Pinus halepensis. In a recent experiment ... question of improper timing, since treating Norway spruce with ethrel alone doubled the number of female cones (Remrod, 1976). Timing of flower in...

Ngày tải lên: 09/08/2014, 04:20