Báo cáo lâm nghiệp: "Seasonal and intraspecific variation of frost tolerance in leaves of three Canarian laurel forest tree species" doc

... assessment of frost damage in upper crown leaves (sun leaves) and inner crown leaves (shade leaves) during warm and cold seasons in Laurus azorica, Persea indica and Myrica faya. Tem- perature of incipient ... freezing temperatures showed an intraspecific variation between leaves exposed in the upper crown (sun leaves) and in the lower and inner parts (sha...

Ngày tải lên: 08/08/2014, 00:22

... negative in uence on the pulping quality increas- ing chemical consumption in pulping and bleaching, decreas- ing pulp yield and pulp brightness, and increasing process costs [20]. For the pulp and ... within and between- tree variability of sapwood and heartwood in four commercial plantations of E. globulus at the time of harvest for pulp pro- duction, and analyse...

Ngày tải lên: 07/08/2014, 16:21

... would increase the exposure of seedlings to the rigors of spring frost and possibly to insect damage since the forest managers do not have a method for pre- venting frost ... sub- ject of numerous studies in forestry and arboriculture. This character is of primary importance since it is linked to frost resis- tance and avoidance of...

Ngày tải lên: 08/08/2014, 18:21

... survival by reducing the risk of intracellu- lar freezing, owing to the lowering of the cytoplasm freezing point, and by maintaining cell turgor [11]. These strategies contribute to increasing the resistance ... used in the nurseries during the growing phase of the plants [28]. It was taken as a reference for calculating the dosage of nutrients applied in the other treatments. T...

Ngày tải lên: 07/08/2014, 16:21

... averages of GE and GC were expressed in absolute values (in %) and also by means of seasonal indexes (Š 1998), which standard- ise their course and eliminate the differences in the level of ... testing times T1 and T2 on the level of 59.1% with standard deviation of ± 17.3% and variation coefficient of 29.3%. e shape of values distribution indicates (accor...

Ngày tải lên: 07/08/2014, 10:21

... 5.5, and 4.3 in rainwa- ter, 6.0, 6.6, 6.2, and 4.3 in throughfall and 7.0, 6.9, 6.1, and 4.7 in sub-throughfall in spring, summer, autumn, and winter, respectively. Ion exchange in canopies and ... pH of rainwater in summer (4.3) and winter (4.3) was very low, being a little bit higher in spring (4.7). As said, rain quantity in spring and summer accounted fo...

Ngày tải lên: 07/08/2014, 16:20

... vapour of infested seedlings was reduced with respect to controls, both in mined and in still green portions of attacked leaves. In July and August, the hydraulic resistance of infested seedlings ... leaves and in green and mined portions of infested leaves, respectively (Fig. 3). In September, g L decreased to about 60 mmol m –2 s –1 both in control leaves...

Ngày tải lên: 08/08/2014, 00:21

... that in RSA N resulting in a significant decrease in the ratio of the two. 3.4. Seasonal changes in content and partitioning of winter C and N in plants Winter C and N represent the amount of ... only one study investigated mechanisms of N stor- age and remobilisation in cork oak during winter and following spring [1] and none considered together dynamics of...

Ngày tải lên: 08/08/2014, 01:22

... observed in F v /F m was due to a decrease in F m with no increase of F o , which may be interpreted as indicating a reversible increase of thermal dissipation in PS II [2, 7]. The increase of F o ... steep increase of F o (Fig. 1), [4]. 2.3. Seasonal time course of thermostability of photochemistry During 2000, T c was recorded four times (beginning of April, beginni...

Ngày tải lên: 08/08/2014, 01:22

... the stem and on fine days during the growing season. On cloudy and rainy days, the depression Diurnal and seasonal fluctuations in the bark respiration of standing Quercus ... respiration rate during the dor- mant season and its increase during the growing season have been observed in many forest tree species. The increase of respiratio...

Ngày tải lên: 09/08/2014, 04:20