Báo cáo lâm nghiệp: "Cavitation in trees and the stems hydraulic sufficiency of woody" doc

... Tyree and Sperry (1988) attempted to answer these questions by measuring and calculating what might be called the hydraulic sufficiency of trees. In valuing hydraulic sufficiency, ... review of the conclusions of the steady-state model and the data used will aid in the under- standing of the more advanced model pre- sented here....

Ngày tải lên: 09/08/2014, 04:20

... if the research focus over the last years was mainly on the role of forests in the global carbon balance. During the last decade, the importance of the inter- specific diversity of the coupling ... Spring 2004 was af- fected by the premature drought-induced leaf fall during Sum- mer 2003 and by the starch content of trees at the end of the growing season...

Ngày tải lên: 07/08/2014, 16:20

... been inoculated. After verification of the normality of Figure 1. Map of the forest of Orléans, with limits of the state forests, the 4 massifs and the zones of pine forests. The numbers of the ... each inoculation point of the top ring and length of the reaction zone was measured on the external sur- face of the phloem. The reaction zone in...

Ngày tải lên: 08/08/2014, 01:22

... differences between provenances in the production of hairs on the collar of ger- minating seedlings (Fig. 1 which bind the III seedling firmly to the soil and assist early water ... differed in stress-induced changes in the partitioning of dry matter into roots, stems and leaves (Fig. 5). Stressed Tennant Creek seedlings allo- cated...

Ngày tải lên: 09/08/2014, 04:20

... France Introduction Our research investigates the relations between the frost-crack occurrence in oaks and some physical and anatomical parameters of solid wood. The starting point ... from the 16th ring up to the sapwood-heartwood limit) and sapwood from both the northern and southern sides of the bole. Each piece was immediately weighe...

Ngày tải lên: 09/08/2014, 04:20

... mounds Sycamore maple is one of the noble broadleaved species. Its representation in the existing species composition of forest stands being rather low, the study of the species and mainly of its root system ... growing roots. Nor can we corroborate the statements of the authors according to whom the sycamore maple mainly roots into a depth during the initi...

Ngày tải lên: 07/08/2014, 04:20

... contains more isorhapontin than astringin (Fig. 3). e rapid decline of the levels of glycosides was described in in vitro maintained excised bark discs of Sitka spruce following the fungal challenge ... of SG was still at its 8-h level, but levels of the other forms of phenolic acids increased; levels of F by 70% and levels of CWE by 25% (Fig. 1). After 24 h...

Ngày tải lên: 07/08/2014, 10:21

... within the area of interest. e nutrient content in the soil was determined in the upper humus layer (FH) and in the mineral soil (B) to a depth of 30 cm. A part of the samples was taken by the ... sufficient, therefore just as in the case of phosphorus, there is a potential to increase it by weathering or by changes in chemical valence in the case of...

Ngày tải lên: 07/08/2014, 10:21

... soil and the lowest (39 kg/ha) at the soil depth of 25–35 cm. Also in the beech stand, the maximum and minimum mortality was observed in the top 5 cm (254 kg/ha) and at the soil depth of 25 ... together were 693 and 561 kg/ha in spruce and beech, respectively. In the spruce stand, the largest production (554 kg/ha) over the entire period was observe...

Ngày tải lên: 07/08/2014, 10:22

... transplanting the number of root tips was 433 ± 18 as a mean of all treatments, and from transplanting until the first sampling in June this increased in all three treatments (Fig. 1b). In July, the ... advantage in improving the suc- cess rate of transplanting also other conifer species in the for- est. Root growth studies are laborious and time consuming and a...

Ngày tải lên: 07/08/2014, 16:20