Báo cáo lâm nghiệp: "Hourly and daily variations of xylem sapflow in sweet chestnut coppices using a thermal measurement method" ppsx

... 744 J-cm- 2 -d- 1 and sapflow = 0.8 mm ’ d- 1 (Fig. 2). Both Figs. 1 and 2 show an influence of net radiation on sapflow variations. With a daily time step, transpiration T is about equal ... and plotted against the vapor pressure deficit (VPD) (Fig. 3). The relationship is quite good and reveals an apparent limit to forest transpirati...

Ngày tải lên: 09/08/2014, 04:20

... 2002070 Original article Intra- and interspecific variations of polycyclism in young trees of Cedrus atlantica (Endl.) Manetti ex. Carrière and Cedrus libani A. Rich (Pinaceae) Sylvie Sabatier*, ... populations of C. atlantica and C. libani. Thus, an archi- tectural analysis [7, 28] of these two species was undertaken in order to evaluate the phenotypic variations withi...

Ngày tải lên: 08/08/2014, 01:21

... seasonal and annual time paces. The modifications of transpiration were successively analysed as a consequence of i) seasonal and annual variations in leaf area index and ii) ... both a daily and annual basis. Leaf area index (LAI, the ratio of leaf area per unit ground area) was often found to be a powerful parameter for the a...

Ngày tải lên: 08/08/2014, 18:21

... susceptibility to damage Table III. Average values and standard deviations of the Fv/Fm para- meter in response to freezing temperatures in sun and shade leaves of Myrica faya during warm and cold seasons. M. ... Fv/Fm para- meter in response to freezing temperatures in sun and shade leaves of Laurus azorica during warm and cold seasons. L. azorica Temperature (°C) Sun...

Ngày tải lên: 08/08/2014, 00:22

... Original article Latitudinal and altitudinal variation of bud burst in western populations of sessile oak (Quercus petraea (Matt) Liebl) A Ducousso 1 JP Guyon A Krémer 1 1 Laboratoire ... authors obtained large variations between populations and these variations are linked to altitude, latitude and spring frost tolerance. The northern popul...

Ngày tải lên: 08/08/2014, 18:21

... (2003): Growth and biomass partitioning of Fagus sylvatica L. and Quercus robur L. seedlings in response to shading and small changes in the R/FR-ratio of radiation. Annals of Forest Science, ... Standard Methods. In partial samples assimilatory organs (number of leaves, their area and dry mat- ter) were evaluated in detail in relation to the other parts of s...

Ngày tải lên: 07/08/2014, 10:21

... undressed individual, (ii) the weight of a dressed in- dividual including head and legs, or (iii) the weight of a dressed individual without head and legs. Age was determined in all animals. In indi- viduals ... that in case there is an abundance of food available during the preceding autumn and favourable environmental factors, the time of farrowing comes earli...

Ngày tải lên: 07/08/2014, 10:21

... parameters in the planting variants and blocks were tested using t-test, confidence intervals, and two-factor analysis of variance ANOVA (M, M 2002). RESULTS AND DISCUSSION Average ... beginning of autumn. e height growth was evalu- ated according to the parameters of all living fir indi- viduals in 2007 and according to 20% of the highest individuals to avo...

Ngày tải lên: 07/08/2014, 10:22

... for all stands and dates together, and bacterial diversity after 2 years are given. Variability explained by the 1st axis of indirect analyses (mostly PCA), all canonical axes (mostly RDA) and ... and selected environmental factors. An initial DCA analysis was used to assess the trend of the data along the gradient. Because the structure was mostly linear, PCA and RDA were calcu...

Ngày tải lên: 07/08/2014, 16:20

... Ager- atina adenophora: Ageraden; Agrostis castellana: Agrocast; Aira caryophyllea: Airacary; Anagallis arvensis: Anagarve; Aphanes micro- carpa: Aphamicr; Arrhenatherum elatium: Arrhelat; Asplenium ... 25 YAH) are discriminated from one another along Axis 1 on the basis of increasing basal area and aerial biomass and decreasing values of all other structural measures. The DCA ordinat...

Ngày tải lên: 07/08/2014, 16:20