Báo cáo lâm nghiệp: "Ecological requirements of some ant species of the genus Formica (Hymenoptera, Formicidae) in spruce forests" pps

... activity of the F. sanguinea ants depending on the quantity of light incident upon the soil surface Fig. 14. GLM of the occurrence of the F. sanguinea ants depend- ing on the quantity of undergrowth ... activity of the F. pratensis ants depending on the quantity of light incident upon the soil surface Fig. 10. GLM of the occurrence of the F. pratensis...

Ngày tải lên: 07/08/2014, 10:21

... ploughing, repair planting), presence of broadleaved species in the neighbour- hood, degree of weed infestation at the time of swarming and the final extent of plant losses after the end of white grub ... i.e. in the more northern regions. In the 3-year developmental cy- cle the first moulting takes place as soon as in the year of hatching and already...

Ngày tải lên: 07/08/2014, 03:22

... However, this opinion concerning the significance of the individual species is in contradic- tion with the information the foresters provided on the distribution of damage which is the greatest ... environment, their feeding behaviour and the damage they cause. At the beginning of the research, we conducted a survey among foresters in the form of a question...

Ngày tải lên: 07/08/2014, 03:22

... mounds Sycamore maple is one of the noble broadleaved species. Its representation in the existing species composition of forest stands being rather low, the study of the species and mainly of its root system ... growing roots. Nor can we corroborate the statements of the authors according to whom the sycamore maple mainly roots into a depth during the ini...

Ngày tải lên: 07/08/2014, 04:20

... bicarinatus oviposit into the larvae of C. lariciphila when borrowing in soil in the late May. The infestation of Cephalcia prepupae is not high and varied within the range of 3.5–6.1% during ... 2004–2005). Measuring of the size of adults (length of body – form head to end of metasoma, length of the fore wing) was carried out using a stereomicroscope with...

Ngày tải lên: 07/08/2014, 10:21

... uncertainty of tree growth in changing climate are the main sources of the final error. In addition, the low presence of some tree species in the source data set negatively in uenced the accuracy ... questions the rank- ing of Scotch pine among economic tree species, at least in the examined territory. e low accuracy of determination of the mean...

Ngày tải lên: 07/08/2014, 10:21

... ranking the highest in adults and the lowest in the overwintering larvae. The SCP has proved to be a reliable index to estimate the cold hardiness of the beetle M. alternatus. The mean SCP of the ... factor in determining the northern limit of the insect distribution. In our study, we observed that the lowest SCP for the overwintering larvae was –24 ◦ C,...

Ngày tải lên: 07/08/2014, 16:20

... significantly lower in the herbicide-treated plants compared to the plants growing in the other treatments. Leaf-mass area was lower in trees growing in the H and LH treatments (only significant in ... application of the treatments, no difference in inter-row weed biomass was found between the mowed plots (M) and the control (V) (Tab. I). The applica- tion of herb...

Ngày tải lên: 07/08/2014, 16:20

... approximately in the same distance (about 1 m) from the stem of five selected trees. e cylinder of the soil probe used for this purpose had the inner diameter of 6 cm and the height (depth of space ... created in the pro- gramme Microsoft Excel. For further processing of data, various modules of Statistica 6.0 (StatSoft Inc.) were used. e correlation was teste...

Ngày tải lên: 07/08/2014, 03:22

... increments), mean coefficient of growth, etc. Mean coefficient of growth (k) is in principle constructed as the n – 1 root of the series marginal links, or of the trend (marginal links of fitted time series ... conversion into money show an evident in uence of the development of prices culminating before 2,000 and significantly falling since that year with a correspond...

Ngày tải lên: 07/08/2014, 03:22