Báo cáo lâm nghiệp:" Structure, spatial distribution and competition in mixed jack pine (Pinus banksiana) stands on clay soils of eastern Canada" pps

... growth of jack pine in pure jack pine stands and stands mixed with aspen or birch. They found no difference in the effect of intraspecific compe- tition from jack pine and interspecific competition ... skewness in basal area distribution of jack pine between pure jack pine stands and stands composed of a mixture of jack pine and ei...

Ngày tải lên: 08/08/2014, 01:21

... production / modèles mixtes / simulation / Pinus sylvestris L. 1. INTRODUCTION Scots pine (Pinus sylvestris L.) forms large forests in most of the mountainous areas of Spain, occupying an area of 1 ... require any information on the spatial distribution of the trees. Distance-dependent (spa- tial) tree-level models, on the other hand, include a spatial competition...

Ngày tải lên: 08/08/2014, 01:21

... original (mean logging intensity = 6 trees ha –1 ). Plots belonging to G2, had a remaining basal area varying between 70 and 79% of the original one (mean logging intensity = 8 trees ha –1 ). Finally, ... resulting from harvesting operations [41]. Only longer term monitoring would provide a correct estimation of the lifespan of this group of species and allow for a more accurate d...

Ngày tải lên: 08/08/2014, 01:21

... dynamics of beech, mixed (fi r beech and spruce beech stands) and spruce stands, relict pine woods and stands in the ecotone of the upper forest limit in diff erent site, stand, air-pollution and ... growth and production is reached in the conditions of the 5 th and 6 th forest vegetation zone. Development and dynamics of natural spruce stands are hi...

Ngày tải lên: 07/08/2014, 10:21

... function of elevation angle in (A) aspen, Jack pine and spruce stands and (B) red alder and Douglas-fir stands. Angular distribution of diffuse PAR 49 RLR sensor beneath aspen and Jack pine stands ... conditions and periods of the day. Results of this study are useful for refining PAR models and determining the potential impact of the different angular...

Ngày tải lên: 08/08/2014, 00:22

... economical conifers) following forest land clear-cutting, slash burning, and soil preparation. Yield decline and land deterioration have become noticeable during this conversion, and how to mainte- nance of soil ... none of the four plantations had their fine root biomass up to 70% of those in the NF after 33 years of for- est conversion. The reduction in fine root occupancy...

Ngày tải lên: 08/08/2014, 01:22

... that the spatial distribution of P. glauca seedlings was mainly random in 5, 16, 76, 77 y stands. In a 16 y stand, seedlings were clumped at distances of 2.5–3 m. Spatial distribution was significantly ... to thank the staff of the Prince Albert National Park for providing information on locations, origin and management his- tory for stands in the Prince Albert Mode...

Ngày tải lên: 08/08/2014, 01:22

... as linear trends, cubic smoothing splines, row and column contrasts and covariates. Second, extraneous variation is a consequence of experimental opera- tions and may be modelled with random ... components in the context of mixed linear models. It is a useful tool for analyzing field variety trials as it allows for the fitting of spatial variability within field trials in...

Ngày tải lên: 07/08/2014, 03:22

... region of Bohemian-Moravian Upland or in a mu- tual comparison between the two regions (see stand situation 5, mutual comparison of stand situation 2 and 3, mutual comparison of stand situation ... maple development, health condition and growth in forest altitudinal vegetation zones (FAVZ) 6 and 7 occurring in pollution damage zones A and B in the air-polluted region...

Ngày tải lên: 07/08/2014, 04:20

... the main reason why the knowledge of the production of mixed stands was insufficient and why it was not proved to satisfaction if tree species grew better in mixed stands or in pure stands. ... accordance of real development and production of Norway spruce, European larch, Eastern white pine, Scotch pine and silver birch in mixed stand in comparison wi...

Ngày tải lên: 07/08/2014, 10:21