Báo cáo lâm nghiệp: "Distribution, historical development and ecophysiological attributes of oak species in the eastern United States " pdf

... even in the absence of fire. ECOPHYSIOLOGICAL ATTRIBUTES OF EASTERN OAK SPECIES The studies reviewed in the previous sec- tions indicate that eastern oak species have expanded ... on the gently rolling till plains of Ohio and Indi- ana, and with Tilia americana in south- western Wisconsin, northwestern Illinois, northeastern lowa...

Ngày tải lên: 08/08/2014, 18:21

... 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 i...

Ngày tải lên: 07/08/2014, 04:20

... traits of the stands. In particular the correlations pointed out the increase of LAI with the increase of DBH, BA, SHOd and DH, until a maximum value falling in turn in the range 10–17 years. The ... stands and significantly (P < 0.001) decreased in the following years, being 7% of the initial value at the end of the time-rotation (30 years). Shoot...

Ngày tải lên: 08/08/2014, 00:22

... efficiency of PSII in the light (∆F/Fm  ) and photochemical quenching (qP) were always lower in N. nitida and along with the photochemical efficiency in the dark (Fv/Fm) they declined in both species. ... drought intensity [6] the same PPFD became probably saturating at a Ψ m lower than −2.5 MPa, producing the increase of NPQ in N. dombeyi and the concomitant dec...

Ngày tải lên: 07/08/2014, 16:21

... and original (B) model. Managing diameter growth 173 activities are finished the volume of the knotty core remains constant and the wood outside this core increases in value as the diameter of ... base is defined as the height of the first living branch of the tree above ground. The fourth working step is closely related to the third because we think that the...

Ngày tải lên: 08/08/2014, 00:21

... Moreover, browsing matched the two species in most of the size variables considered, cancelling the advantage in height and crown projection of the deciduous oak at the beginning of the resprouting process. ... 3), with individuals of both species browsed at the begin- ning of winter reaching lower crown projection at the end of the study. This negati...

Ngày tải lên: 08/08/2014, 00:22

... essential for the success of this species, especially for providing the basal area and the recruitment of the second wave of seedlings or advanced regeneration associated with the opening of the canopy. Logs ... the total basal area in a 16 y stand and remained the dom- inant tree species until 93 y. Picea glauca dominated the tree canopy between 93 and 17...

Ngày tải lên: 08/08/2014, 01:22

... and model were observed in the morning and in the evening, probably due to a dehydration in the morning of the water exchangeable tissues of the trees (Jarvis, 1975), followed ... 35-year-old sessile oak stand (Quercus petraea) regenerated from seed. Other species growing in the understorey were removed (mainly Tilia and Carpinus)...

Ngày tải lên: 08/08/2014, 18:21

... H the height (mm) and TSL the terminal shoot length in 2002 (mm) of the seedlings. We did not use biomass gain as a target parameter since no data on the basal diameter at the beginning of the ... sunflecks occurred mainly early in the morning or late in the evening. In contrast, in the treatments ‘noon’ and ‘control’ the input of unplanned direct energ...

Ngày tải lên: 08/08/2014, 00:22

... transplanting the number of root tips was 433 ± 18 as a mean of all treatments, and from transplanting until the first sampling in June this increased in all three treatments (Fig. 1b). In July, the ... is indicated by different let- ters. The development in root DW remained low in the period from transplanting to the first sampling in June (Fig. 2a). From June to...

Ngày tải lên: 07/08/2014, 16:20