Báo cáo lâm nghiệp: "Evaluation of twenty-years-old pedunculate and sessile oak provenance tria" doc

... prov- enances of sessile oak: 11 Křivoklát (6.36 m) and 31 Bučovice (6.62 m) and of pedunculate oak: 12 Křivoklát (6.72 m) and 45 Strážnice (6.76 m).  e type of branching of sessile oak is character- ized ... stem shape evaluation document that fi ve provenances of sessile oak and four prov- enances of pedunculate oak had the highest propor- tion of...

Ngày tải lên: 07/08/2014, 10:21

... differences). RESULTS Comparison of the growth of parent trees and clones of the 1 st and 2 nd generation Research plots were evaluated in the intervals of several years. So data acquired in plantations of dif- ferent ... Journal of Forest Research, 22: 335–361. J B. (1999): Stand establishment and early growth of planted Pinus sylvestris and Picea abies related...

Ngày tải lên: 07/08/2014, 03:22

... on the pro- cesses and trends of squared timber and log pro- duction and the relations between them in the Hyr- canian Forests of Iran during the last 20 years. MATERIALS AND METHODS Areas under ... wood and charcoal (Table 2). Fig. 1. Study site location Supported by the Ministry of Education, Youth and Sport of the Czech Republic, Project No. MSM 6215648902, and by...

Ngày tải lên: 07/08/2014, 10:21

... properties of a landscape. Any changes in the landscape structure (in space and time) change the course of energy-material flows in the landscape, affect the permeability and habitability of the land- scape, ... the existence of diverse landscapes? Fenina, 178: 55–80. W T. (1998): Landscape structure as indicators for sustainable land use? A case study in alpine and lowla...

Ngày tải lên: 07/08/2014, 10:21

... spruce trees. The results document good preconditions for the establishment of vital and stable stands when the entire growth spectrum of planting stock and particularly of plants produced from ... traits of young spruces with known growth rate in a nursery and after outplanting are carried out in the framework of the grant project “Conservation of the stability and b...

Ngày tải lên: 07/08/2014, 10:21

... the smallest possible diameter in the stand and thus it should be between 0 and the mini- Table 1. Descriptive statistics of stand and tree variables Stand variable (86 plots) Tree variable (n ... Weibull distribution and compar- ing their performances with the MLE and MOM. The objective of this research is to assess and compare the accuracy of the above three estimators...

Ngày tải lên: 07/08/2014, 10:22

... of fine * Corresponding author: cha@lwf.uni-muenchen.de roots is a key component of understanding the productivity and functioning of forest and woodland ecosystems. Traditionally, estimates of ... improve terrestrial ecosystem models and their estimates of carbon cycling [11]. Thus, the objective of this work was to evaluate the suitability of the model of Ammer and Wa...

Ngày tải lên: 07/08/2014, 16:20

... growth of a subject tree of a given species is assumed to vary as a power function of the size of the neighbour, and as an inverse power func- tion of the distance to the neighbour. The net effect of ... distance-independent (basal area of competitors) and the best distance-dependent (CRWD) index are provided in Tables IV and V and Figures 3 and 4. The combination of...

Ngày tải lên: 07/08/2014, 16:21

... preservation of biodiversity and the landscape, etc., are the lengthening of the rotation, retention of part of the trees in final cutting and, to a lesser extent, the thin- ning regime and the level of ... retention of a portion of the stand in the final cutting, and the extension of rotation to fulfill these non-timber producing objectives in the other case. The resul...

Ngày tải lên: 08/08/2014, 01:22

... (%) Species Ratio of the number of dead trees to the number of living trees Ratio of the volume of dead trees to the volume of living trees Ratio of the number of recruited trees to the number of trees ... direction of changes taking place in biomass of the ecosystem in the layer of trees, and this is why it is taken into account in determination of stages a...

Ngày tải lên: 07/08/2014, 03:22