Báo cáo lâm nghiệp: "Physiological aspects of seed conservation" pot

... Testing of tree seeds (Pol.) lnst. Pol. Rech. For. Ser. A45, 40-43 study the demands of seeds of each spe- cies separately. In the case of species with a large area of natural ... storage of non- dormant and/or deep-dormant seeds of woody plants, where the whole complex of problems concerning storage, breaking of dormancy, germination an...

Ngày tải lên: 09/08/2014, 04:20

... little effect on the localization of assimilation. However, studies of the distribution of nitrate reductase activity (NRA) between the roots and shoots of tropical and sub- tropical ... reduction is a characteristic of pioneer species both temperate and tropical. Many of the woody species, which in pot experiments exhibit a predominance of r...

Ngày tải lên: 09/08/2014, 04:20

... forest in light of the present atmosphere load of pol- lutants. Because of some of the attributes alrea- dy discussed, it is understandable that trees have not often been studied ... close as a result of the penetration of pollutants. Considering the complexity of stomatal function, it is hard to make general statements about the behavior...

Ngày tải lên: 09/08/2014, 04:20

... spatial hetero- geneity, which can implicate a violation of the assumption of residual independence of the analysis of variance. Residuals of each variable after subtracting the clone effects were ... included phe- notypic mass selection and the use of this material for seed production in clonal seed orchards. The natural infection by B. jaapii in two seed orchards gave us th...

Ngày tải lên: 07/08/2014, 16:20

... concentration of Table I. Morphological attributes (mean ± SD) of subsamples (n = 40) of dormant and growing seedlings at the beginning of the experi- ment (24 June). Attribute Dormant seedlings Growing seedlings Height ... growing seedlings, most of them in block 4. These seedlings were excluded from further measurements and analysis. Height growth of surviving seedlings was dete...

Ngày tải lên: 08/08/2014, 00:21

... number (+ 1 s.e.) of seeds per tree for potential (= (no. of filled seeds + no. of damaged seeds) × germination rate × no. of serotinous cones) and realised seed crop (= no. of filled seeds × ger- mination ... the impact of seed predators, the potential and realised seed crop were finally calculated according to the formulas: 1. potential seed crop = (no. of filled seeds...

Ngày tải lên: 08/08/2014, 01:21

... conductance below that of control seedlings by d3 of the treatment (fig 1). From d3 through termination of the experiment, stomatal conductance of stressed seedlings remained ... for seedlings established in hypoxic nutrient solution (table I). Total plant biomass of seedlings estab- lished in hypoxic nutrient solution was 40% less than that o...

Ngày tải lên: 08/08/2014, 18:21

... beginning of May and ended in mid-June with the peak at the end of May and beginning of June in 2005 (Fig. 2). In 2006, the flight activity started later in mid of May and lasted to the beginning of ... types of ecosystems (S 1996). Larvae live on branches under scales of co- chineals (Sternorrhyncha: Coccinea) of Coccidae (= Lecaniidae), adults can be found on bra...

Ngày tải lên: 07/08/2014, 03:22

... level of water stress mobilize the defence mechanism of stressed trees what subsequently leads to an increase of resin production. Simulation of such attack may lead to a decrease of frequency ... average depth of entry holes was bigger on trees which were less stressed by a lack of water. e exact mechanism of these relationships between the water stress and the increa...

Ngày tải lên: 07/08/2014, 03:22

... variability of trees, all logs were taken from one tree. Rearing was per- formed at a stable temperature of about 24°C and in the conditions of a long day (15 hours). Estimation of the effect of sub-sterilizing ... ȱ=ȱ5 a a a a a b a a a a b a a a a 0 10 20 30 40 50 60 70 80 Size of mating chamberȱ(mmȱ) Lenght of mother tunnelȱ(mm) Number of eggsȱper motherȱtunnel Number of larvae...

Ngày tải lên: 07/08/2014, 03:22