Báo cáo lâm nghiệp: "Water movement and its resistance in young trees of Cryptomeria japonica" pot

... Water movement and its resistance in young trees of Cryptomeria japonica H. Yahata Laboratory of Silviculture, Department of Forestry, Faculty of Agriculture, Kyushu ... University, Fukuoka, Japan Introduction Information about water flow resistance is essential to understanding and simulating water movement in trees (Yahata, 1987). There...

Ngày tải lên: 09/08/2014, 04:20

... with a maximum in autumn and a minimum in winter (between January and March). Winter temperatures often fall below 0 °C and in the coldest month (January) the mean of the daily minima is, on average, ... as of root and shoot hydraulic resistance in three field- growing species co-occurring in the same habitat i.e. Cotinus coggygria L. (Wig tree), Prunus mahaleb L. (Mah...

Ngày tải lên: 08/08/2014, 01:21

... coppicing of shade- intolerant broadleaves prevented them from competing with the silver fir and from reaching the dominant, codominant and intermediate layers, thus making it possible to maintain ... establishment of pioneer species and of early-seral shade-intolerant species, historical data of logging. The stands investigated are relatively young; in the past 70 years some...

Ngày tải lên: 08/08/2014, 01:21

... de- ciduous trees. H and V (2002) ob- served the peak of its activity in spruce forests of Paskovský les and Loucký les at the end of May in 1998. e delay of its flight activity in highlands, ... regularly occurring in coniferous trees. We recorded this species from the mid of May to the mid of August with the peak of its activ- ity at the begi...

Ngày tải lên: 07/08/2014, 03:22

... frost resistance of expanding current-year needles of the Canary Island pine and subalpine evergreen timberline conifers of continental Europe suggest that frost hardening during sprouting and ... formation and E2, released during intracellular freez- ing, were recorded on 1 year old needles of potted seedlings of P. c a - nariensis during controlled freezing treatments (coo...

Ngày tải lên: 07/08/2014, 16:20

... Spain (Fig. 1). Two of these fires occurred in the provinces of Barcelona and Tarragona (NE Spain), where 50 000 ha and 12 500 ha were burned, respectively, and the other two in the provinces of ... differences depending on whether seeds are from serotinous or non-serotinous cones. Pine prove- nance must also be regarded as an important factor in deter- mining germination [9]....

Ngày tải lên: 07/08/2014, 16:21

... cytokinin promoted effects could then cause an increased flux of auxin from the shoot to the root. As this hypothesis seems compatible with the finding of increased levels of cytokinins in needles ... the cytokinin content in the shoot. In discussing the elevated content of cytokinin ribosides in shoots of seedlings grown on STRESS-AlCl 3 – and STRESS- NAA-medium, we assu...

Ngày tải lên: 08/08/2014, 00:22

... LD also played a role in removing dormancy and/ or initiating growth. The findings of experiment 3 supported this hypothesis. In the Casentino seedlings a LD reduced the thermal ... seedlings had been transplanted at the beginning of autumn in the year of germination (1987) to pots (diameter 18 cm, depth 30 cm) containing 50% fir and ches...

Ngày tải lên: 08/08/2014, 18:21

... all chest- nut trees of the Mediterranean area. Dif- ferences in aboveground stand biomass resulted mainly from variations in stand density of individual trees and their reparti- tion ... Mediterranean. Biomass of individual trees, aboveground stand biomass, their yearly increments and nutrient contents were studied in coppices of Spain, Ita...

Ngày tải lên: 08/08/2014, 18:21

... level of spermidine (M et al. 1999). A high level of putrescine was determined in the pro-embryogenic tissue of Picea rubens, while spermidine was predominant during the stages of embryo ... ecotype of Norway spruce. Contents of free polyamines (putrescine, spermi- dine, and spermine) were determined in different developmental stages of Norway spruce somatic emb...

Ngày tải lên: 07/08/2014, 10:21