Báo cáo lâm nghiệp: "Canopy structure and spatial heterogeneity of understory light in an abandoned Holm oak woodland" pps

... effect of land use change on the canopy structure and the understory light of a Holm oak woodland in central Spain. The woodland studied had two dis- tinct zones, one where the original woodland structure ... mean height of individual Holm Tab le I. Mean and standard deviation (SD) of canopy height, number of stems and basal area for the 900 1-m 2 sampling point...

Ngày tải lên: 07/08/2014, 16:20

... formation of mineral inclusions is induced or increases when the main functions of the woody tissues shift from transport and storage of water, minerals and assimilates, as in sapwood and earlywood, ... pixels and minimum, maximum and average surface proportion (in %) of such pixels in the X-rays of 0.7 mm and 2 mm strips of trees I, II and IV (60 rings analysed...

Ngày tải lên: 07/08/2014, 16:20

... destruens and T. piniperda in Italian transition areas between continental and Mediterranean pine forests. 2. MATERIALS AND METHODS 2.1. Sample collection and DNA isolation Adults of Tomicus were ... role in the decline of many pine forests growing in both Europe and Mediterranean countries, inclu- ding Northern Africa. Among the six species belonging to the genus Tomicus,...

Ngày tải lên: 08/08/2014, 00:22

... 2.14344 deviation from 3 significant insignificant insignificant insignificant insignificant significant insignificant insignificant insignificant insignificant insignificant insignificant half-sum 8.85 7.15 9.73 ... 0.15 deviation from 0 significant insignificant significant significant insignificant significant insignificant insignificant insignificant insignificant insignificant insignificant acuteness (kurtosis)...

Ngày tải lên: 07/08/2014, 03:22

... spruce and beech stand and mixed stands in car- bon reserves and between beech stand and both mixed stands in nitrogen reserves only. – e C/N ratio of the spruce stand was 23.5 (± 1.8), which of ... beech and larch with beech) aged 25 years with a pure beech stand (aged 40 years) and pure spruce stand (aged 30 years) in the Drahanská vrchovina Upland. MATERIAL AN...

Ngày tải lên: 07/08/2014, 03:22

... 149 derplantings increases with a decreasing content of these nutrients in needles. An opposite correlation was determined for aluminium: with an increasing proportion of this element in nutrition ... limit of the lower optimum of 130 mg·kg –1 . In the subsequent organomineral horizon (Ae/Ep) the values of Ca indicate the lower optimum reserves in the range of 80...

Ngày tải lên: 07/08/2014, 10:21

... similarity in frost resistance of expanding current-year needles of the Canary Island pine and subalpine evergreen timberline conifers of continental Europe suggest that frost hardening during sprouting ... resistance of needles in seedlings of P. canariensis in different stages of development: currently expanding, fully expanded, and 1 year old needles. Some seeds of P...

Ngày tải lên: 07/08/2014, 16:20

... and SG-ratio tested depending on thinning intensities for radiata pine and maritime pine. Pinus radiata Pinus pinaster Intensity of First thinning Second thinning First thinning Second thinning thinning ... removals and nutrient returns to soil as logging residues due to thinnings and clear-cutting as a function of thinning intensity and site quality for maritime pine stands, i...

Ngày tải lên: 07/08/2014, 16:21

... ageing of cork oak stands, loss of cork quality [41], intense pruning [8] and increased cork oak decline (“seca”) [27]. Cork oak stands in Spain can be differentiated into open cork oak woodlands ... Mean, standard deviation and range of the main characteristics of the sample trees subjected to stem analysis in the two studied areas (CAT and PNLA). Area n Variable Mi...

Ngày tải lên: 08/08/2014, 00:22

... overestimated and might in fact be rather low. This effect is linked to a far larger decrease of the standing volume of trees (and thus carbon) in the forests and of soil carbon because of the harvesting, ... practice guidance and other information on land use, land-use change and forestry; implications of harvested wood products accounting; sub- mission from Parties,...

Ngày tải lên: 08/08/2014, 00:22