Báo cáo lâm nghiệp:"Influence of cotyledon removal on early seedling growth in Quercus robur L " doc

... after. Finally, the effect of cotyledon removal on seedling growth was tested at different stages of plant development. Cotyledon excision was made at shoot emergence in one set of plants and ... controls. Interestingly, cotyledon removal reduced growth to a larger extent in the light than under shade. The time course of the impact of cotyledon severing after...

Ngày tải lên: 08/08/2014, 01:21

... SE. ψ L ψ L ψ L ψ L Influence of herbaceous competitors 783 At the end of each growing season, the root collar diameter of each living seedling in the experiment was measured. In addition, one ... proba- bly affect the growth of seedlings in the second year. Secondly, mowing was not effective as a tool for vegetation control since competition did not occur for light,...

Ngày tải lên: 08/08/2014, 01:22

... the inner xylem of beech and provides adequate information for fitting of the Weibull response curve. Table II. Mean of SFD day for each sensor insertion depth on typical environmental condition. ... Mean annual air temperature was 9.3 °C at study sites in 1999. Snow remained until the beginning of May, and beech leaves begin to flush in late April or early May, while autumn...

Ngày tải lên: 08/08/2014, 00:21

... chemicals in plant cuticles. Rev Environ Contam Toxicol 108, 1-70 Original article Influence of marine salts on the localization and accumulation of surfactant in the needles of ... sulfonate could accumulate in the leaf cuticle of P halepensis Mill after a 2 min immersion of the foliage in a saline solution of LABS simulating a storm....

Ngày tải lên: 08/08/2014, 18:21

... were not observed in leaves harvested in mid- August. Chlorophyll content The chlorophyll content of early leaves was also influenced by the light conditions of year n (Fig. ... were less noticeable in early leaves harvested later, and were no longer significant in late leaves. Discussion All analyzed characteristics (structure, anatomy and ch...

Ngày tải lên: 09/08/2014, 04:20

... aggregation of regeneration on PRP 37. CONCLUSIONS e presented results confirm high potential of natural regeneration on permanent research plots. On the majority of plots in lower elevations (to ... biological crown cover reached the value 0.78. e natural regeneration of beech occurs mainly in small groups located in small gaps. Spruce regeneration forms clumped st...

Ngày tải lên: 07/08/2014, 10:21

... Actas del II Congreso Forestal Español, Tomo III, 1997, pp. 627–632. [56] Thompson L. E., Seedling morphological evaluation. What you can tell by looking, in: Duryea M .L. (Ed.), Evaluating seedling ... Effects of shelters tubes on Juniperus thurifera L. seedlings 719 2.2. Laboratory analysis of plant quality The laboratory analysis was carried out on a set of 25 of this se...

Ngày tải lên: 08/08/2014, 00:22

... respec- tively) such as Atractylis humilis L. , Chondrilla juncea L. , Helichrysum stoechas (L. ) Moench., Leontodon taraxacoides (Vill.) Mérat and Phagnalon saxatile (L. ). Cass. Leguminosae was also well ... whereas that of T ts was significantly lower in Calasparra. These results agree with those of vegetation cover obtained in this locality, thus indicating that elimination of...

Ngày tải lên: 08/08/2014, 01:22

... cross-validation results occurred by including more variables. In addition to the two compulsory predictors, all rel- evant combinations of x-variables included x4 (= ln(h/[h - ... 9, 10 in equation [A2b]. Defining a1 -a10 as

Ngày tải lên: 08/08/2014, 18:21

... les échantillons ayant été ramassés au sol, il fallait être sûr de leur provenance. Ces conditions définissent en fait un échantillonnage stratifié selon le milieu et l appartenance ... d’échantillons (ce qui minimise la perte d’information). L analyse factorielle des correspondances se rapporte donc à la matrice Sur chaque feuille, on mesure l a...

Ngày tải lên: 09/08/2014, 06:21