Báo cáo lâm nghiệp: " Zygotic embryogenesis and empty seed formation in European larch (Larix decidua Mill )" pptx

... November 2004) Abstract – Zygotic embryo development and its influence on empty seed formation of the European larch (Larix decidua Mill. ) was studied within a seed orchard in the Slovak Republic. ... studies of zygotic embryogenesis could contribute to understanding some mechanisms of unsound seed formation in European larch. 2. MATERIALS AND METHODS...

Ngày tải lên: 08/08/2014, 00:21

... area index (PAI, including leaf and skeleton indexes) by conventional gap fraction analy- sis of hemispherical photography and reported values of 34 and 63% of that determined destructively in ... stand LAI was about 0.96 when expressed per total orchard area. The same value of LAI was obtained when inte- grating “horizontally” individual trees or when integrating all canopy layers i...

Ngày tải lên: 07/08/2014, 16:21

... Throughfall and stemflow chemistry in a northern hardwood forest, J. Ecol. 61 (1973) 495– 508. [12] Edwards P.J., Studies of mineral cycling in a montane rain forest in New Guinea. Rates of cycling in ... Nakagawa Y., Rainfall and forest runoff chemistry: The 30-year change in the amount of dissolved elements in rainwater, input output budget of elements in rainfall and ru...

Ngày tải lên: 08/08/2014, 00:21

... and polished using sand-paper of progressively finer grain. Then, they were cross- dated using characteristic tree-rings, mainly narrow (e.g., 1965, 1986) and light rings (e.g. 1963, 1972). In ... occurred in codominant and dominant trees (Tab. IV). No brooms were observed in subdo- minant trees. All brooms in codominant trees were observed on the trunk, and 79% of the brooms...

Ngày tải lên: 08/08/2014, 00:22

... different thermal chocks and control situation. Control 50ºC 75ºC 100ºC 125ºC 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min Halimium alyssoides ... 2 Control 70 ºC 90 ºC 110 ºC 130 ºC 150 ºC 170 ºC 190 ºC 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min Pinus sylvestris 94 94 95 93 90 92 8 78 0 27...

Ngày tải lên: 08/08/2014, 01:21

... managed to increase seedling growth and reduce seedling damage during establishment. Inversion of the soil profile in patches and field vegetation control with herbicides did not increase seedling growth ... Two seedlings per treatment and block (in all 64 seedlings) were harvested during dormancy for three growing seasons and on two additional occasions during the first growing s...

Ngày tải lên: 08/08/2014, 01:21

... CO 2 concentration will induce higher photosyn- thetic rates in herbaceous C3 plants and also in trees (Ceulemans and Mousseau, 1994). However, initial increases in photo- synthesis ... 1991) and in Pinus taeda L (Teskey, 1995). These direct effects, reviewed by Amthor (1991), have been sug- gested to involve changes in the intercellu- lar p...

Ngày tải lên: 08/08/2014, 18:21

... fluid. The cross-pollinated seed lot was clear- ly the best for the variables: seed produc- tion/capsule, rate of germination and seedling survival, and the self-pollinated lot was ... This trend was also found in subsequent growth in the field. Frost tolerance These results suggest that hardening had no effect on frost resistance in the cross...

Ngày tải lên: 09/08/2014, 04:20

... of asparagine. Both glutamate and alanine increased as leaf NR activity increased. Rhodes et aL (1976) found that glutamate and alanine pools increased in Lemna minor as nitrate ... occurring in most species in spring, when the buds of deciduous species are beginning to break. Amino acid analyses show that glu- tamate and alanine concentrati...

Ngày tải lên: 09/08/2014, 04:20

... has the opposite pattern to non- leaf-mining species being scarce in spring and most numerous in autumn. FlF is the seasonal guild in which differences in individual tree phenology play an important ... leaves and the increasing accumulation of tannin as reported by F (1970) and also F et al. (2004). Because of a lack of information about the quality of food and...

Ngày tải lên: 07/08/2014, 10:21