Báo cáo lâm nghiệp: "Ecological light measurement in forests using the light degradation effect in hydrogenated amorphous silicon(a-Si:H)" pot

... culmination (increased discharge); they in- vestigated watersheds which were not artificially drained in the whole area (within the UDL study area – approximately 1/6 of the area is drained). ... Final unit hydrographs show changes of hy- drological conditions (runoff) affected by drainage treatment including the in uence of forest stand in the watershed. Both factors acting...

Ngày tải lên: 07/08/2014, 10:21

... article Ecological light measurement in forests using the light degradation effect in hydrogenated amorphous silicon (a-Si:H) C Ammer G Krötz 2 1 Lehrstuhl für Waldbau und Forsteinrichtung der ... since the first light measurements were performed in forests, it has always been pointed out that the measuring system must record not only...

Ngày tải lên: 08/08/2014, 18:21

... were sampled in closed spruce forests in the age classes 0–2 (clear- ings-samplings), 3–5 (plantations), 8–12 (thinnings), 26–41 (thickets) and 85–105 (mature forests) years in five independent ... of stand stages (clearings-samplings, plantations, thinnings, thickets, and mature forests) of spruce forests were examined at the foothills of the Jizerské hory Mts. in summer...

Ngày tải lên: 07/08/2014, 10:21

... Understory light in an Holm oak woodland 753 Figure 2. Map of the canopy height (m) of the studied Holm oak woodland. The map was based on 900 sampling points interpolated by Krigging using the exponential ... being always higher in the tree- dominated than in the shrub dominated zone, and at the shrub than at herb layer (Tab. V). The usage of 4 m 2 sampling points i...

Ngày tải lên: 07/08/2014, 16:20

... cy- cle the first moulting takes place as soon as in the year of hatching and already in the advanced sec- ond stage the larvae winter. In the 4-year develop- mental cycle the first moulting of ... weeds. Using the other method, i.e. ploughing, the stumps remained on the forested area and furrows were ploughed across the area, 1.4 m spacing. e plants of the wo...

Ngày tải lên: 07/08/2014, 03:22

... transported into the needles in excess of the physi- ological needs becomes immediately precipitated as inactive oxalate, thereby maintaining a constant free Ca pool. is also means that the synthesis ... Differences in the properties of the particular sampling points and the fact that the in uence of soil heterogeneity on the specificity of forest stand cannot be ful...

Ngày tải lên: 07/08/2014, 03:22

... with increasing depth (Figs. 2 and 3) in all stands and the lowest values were determined in the H layer. e lowest values in forest floor in the H horizon (3.5 and 3.7) as well as in the organomineral ... al. 2000). In forest soils of Europe, the C/N ratio ranges between 10 and 100 in the organic horizon the major- ity of the C/N ratio values occurring withi...

Ngày tải lên: 07/08/2014, 03:22

... budbreak and the beginning of foliage became evident in all monitored species most mark- edly. Because of a rapid increase in temperatures in May 2006, the duration of the stage of the beginning of ... weather the particular stages can be shifted and thus the further development of plants disturbed. Depending on changes in weather in the given climatic conditions...

Ngày tải lên: 07/08/2014, 03:22

... as a shade-tolerating species. With the increasing light intensity the diameter and height growth of oak seedlings increases proportionally, being the highest at 100% light intensity. However, ... 359–368 365 ameter and height increment increase with the in- creasing degree of light intensity (Fig. 5). At the beginning of the monitored period (2008 to 2010), the diame...

Ngày tải lên: 07/08/2014, 10:21

... (2006): Modelling the structure and development of forest stands using the growth simulator SIBYLA. In: V S. (ed.): Increasing the Ratio of Close-to-Nature Structures of Forests with Special ... ratio of silver fi r in the forest stand.  e complex diversity of the stand was in the fi rst year of measurement very high, but shows slight de- crease during following...

Ngày tải lên: 07/08/2014, 10:21