Báo cáo lâm nghiệp: "Geographic variation and bud dormancy in seedlings (Fagus sylvatica L)" potx

... sprouting in F sylvatica seedlings in spring also depended upon prior chilling received. Fa- lusi and Calamassi (1990), also working with seedlings, found that chilling was in fact ... LD also played a role in removing dormancy and/ or initiating growth. The findings of experiment 3 supported this hypothesis. In the Casentino seedlings a LD...

Ngày tải lên: 08/08/2014, 18:21

... were sam- pled in the vicinity of these plots, during autumn 1999. During 2000, seeds germinated and young seedlings grew in 400-cm 3 pots contain- ing a mixture of peat and pine bark, under ... (in per cent of global irradiance in southern France, Avignon) for the potted saplings in north-eastern France (plots and linear regression) and in southern France (mean, standar...

Ngày tải lên: 08/08/2014, 00:22

... active radiation for a dominant tree and an intermediate one. Data were collected in the upper level of the canopy (dotted line) and in the lowest level (plain line) and restricted after full-leaf ... converted in carbon mass for each sample tree during the growing season 1997 (from DOY 150 to 266). Carbon balance and tree growth in a beech stand 53 A n to have increased linea...

Ngày tải lên: 08/08/2014, 14:21

... vector of random-effects parameters including general com- bining ability (GCA) for female and male, specific combining ability (SCA), GCA by site interaction, SCA by site interaction, and plot- to-plot ... genetic variation in certain wood properties in loblolly pine. Considerable genetic vari- ation in α-cellulose content, average fiber length, and lignin content have also been r...

Ngày tải lên: 07/08/2014, 16:20

... is now increasingly planted in Europe, both in afforestation of abandoned farmland and enrichment of forests [26]. In Gali- cia (NW Spain) a long term breeding program for this species was started in ... 0.05. and without the covariate indicates that 17.7–65.0% in Areas and 55.5% in Sergude of the explainable variation in clone mean leaf spot susceptibility is explained b...

Ngày tải lên: 07/08/2014, 16:20

... factors, including size, age and tree density [24]. In one strategy, seeds germinate from non-serotinous cones un- der warm and dry weather conditions, and in the other, they develop from serotinous ... differences depending on whether seeds are from serotinous or non-serotinous cones. Pine prove- nance must also be regarded as an important factor in deter- mining germination [9]....

Ngày tải lên: 07/08/2014, 16:21

... the cytokinin content in the shoot. In discussing the elevated content of cytokinin ribosides in shoots of seedlings grown on STRESS-AlCl 3 – and STRESS- NAA-medium, we assume that the increased ... cytokinin levels in shoots of stressed seedlings could in addition to the increased number of root meristems result from metabolic fine tuning processes caused by the activity of...

Ngày tải lên: 08/08/2014, 00:22

... important handicap for including the pine weevil resistance as a selection criteria in the breeding pro- gram. Selections for growth would result in increased suscep- tibility, whereas including the ... all seedlings (94%) showed some pine weevil damage. Severe attacks led to stem girdling (42% of seedlings) and consequently leader loss, causing important growth losses and stem def...

Ngày tải lên: 08/08/2014, 00:22

... biomass and chemical analysis At the beginning of October, in the dormancy of seedlings, 35 seedlings of each pot were randomly harvested for plant analy- sis. About 15 seedlings were left in the ... mg). Seedlings growing in decayed dead wood had the highest root weight within all three tested soil substrates and significantly higher values of needle and shoot weights tha...

Ngày tải lên: 08/08/2014, 00:22

... was thinned during winter 1994/1995 and during winter 1998/1999 as shown by huge changes in leaf area index (Tab. I). Trees were about 30 year-old at the beginning of the measurements in 1996. ... increased rooting space, will stim- ulate coarse root branching and elongation of the remaining trees, and fine root proliferation. Indeed, reduced competition for water after thinning inc...

Ngày tải lên: 08/08/2014, 01:22