Báo cáo lâm nghiệp: "Effect of single Quercus ilex trees upon spatial and seasonal changes in soil water content in dehesas of central western Spain" potx

... 355 c  INRA, EDP Sciences, 2007 DOI: 10.1051/forest:2007012 Original article Effect of single Quercus ilex trees upon spatial and seasonal changes in soil water content in dehesas of central western ... spring rainfall decreased soil water content quickly until June or July. Soil water content remained nearly constant during the rest of the...

Ngày tải lên: 07/08/2014, 16:21

... distribution of rust infection re- mained stable in the tested set of clones during the trial.  e intensity of infection during the growing sea- son in 2005 and 2007 was evaluated in the same ... t-test Table 5. Increments of stem diameter and plant height from the beginning of vegetation to the fi rst rust incidence (beginning of July 2007) and their percent proport...

Ngày tải lên: 07/08/2014, 10:21

... (Eq. (8)) are shown in Table III. The slope γ ij decreased with increasing stand density and increasing admixture of beech. The slope increased with increasing site index. Stand age had no signif- icant ... from thinning in absolute terms than did thinner trees. Continually, the presence of beech in mixtures affects the basal area increment of oak, such that beech admixture ch...

Ngày tải lên: 07/08/2014, 16:20

... was performed in 1984. Values (stem number and basal area just before and after thinning and thinning ratio) are shown for 1984 and 1995. Plot Before thinning After thinning Thinning ratio 1995 Stem ... was also in the order UT > LT > HT (Fig. 2b). Yang [41] and Strong and Erdmann [33] also reported higher mortality in un- thinned stands than in thinned stands. In...

Ngày tải lên: 07/08/2014, 16:20

... explained 60% and 19% of total variance. The F1 axis was determined on one hand, by the nitrate and water- extractable Ca, Mg, and Mn contents, and on the other hand, by the water- extractable Fe and ... emission of compounds inhibiting nitrogen mineralization (i.e. 20000-fold less in clear-cut plot than in the forest). Net nitrification was mainly the highest in soils o...

Ngày tải lên: 07/08/2014, 16:20

... fungi: 80 mL of a solution containing 20 g of glucose, 1.5 g of peptone, 7.5 g of malt extract and 1 000 mL of distilled water. After inoculating glass jars with fungal cultures and waiting 10 days, ... retention efficiency of such combinations is around 15 to 50% of initial boron retained [16, 17,20]. We observe since a few years an increasing interest in the wood treatme...

Ngày tải lên: 07/08/2014, 16:21

... determinant of soil water content than water reten- tion capacity resulting from the soil texture and structure on this trial plot.  e temperature and moisture pattern is refl ected in the ... interaction effect indicating the heterogeneity of blocks. Analysis of covariance using single- tree kriging estimates of environmental variables as covariates showed that i...

Ngày tải lên: 07/08/2014, 10:21

... the context of this exceptional event. Observations of changes in population levels of the main European forest insect pests during and after the drought are presented and discussed in the light of current ... understanding of the dynamics of forest insect populations. It is often difficult to disentangle density dependent and density independent pro- cesses involved in...

Ngày tải lên: 07/08/2014, 16:20

... rotation age for MFA and MOE and at least 80% effective for wood density. 5. Thinning of trials increased ring width and MFA, reduced ring wood density and MOE of remaining trees in the first two or ... Aus- tralia. King and Burdon [24] studied the time trend in inher- itance and projected efficiencies of early selection in a large 17-year-old progeny test in New Zeala...

Ngày tải lên: 07/08/2014, 16:20

... number of crop (selected) trees in the first thinning and thinning intensities, taking account of economical factors [46, 51]. In Slovenia, selective thinning is the main type of thin- ning [34]. ... again during the last thinning. In the T2, 258 crop trees were chosen in the first thinning, and only 62% of these trees were chosen again during the last thinning. Only c...

Ngày tải lên: 07/08/2014, 16:20