Báo cáo lâm nghiệp: "Occurrence of foliar nitrate reductase activity not induced by nitrate in symbiotic nitrogen-fed black alder (Alnus glutinosa)" ppt

... NR activity: one group having low enzyme activity (plants 1-3) and one having high enzyme activity (plants 9-12). Occurrence of foliar nitrate reductase activity not induced ... leaf NR activity measured in vivo in alder might be of microbial origin. This hypothesis was tested by using plants in axenic culture. Leaf NR activity o...

Ngày tải lên: 09/08/2014, 04:20

... detect- ed in various abundances on pines. Feeding outsets were found on the edge of pine branches; afterwards they were also found on living pine stems in different parishes where the pine predominated. ... densities. In the study area in the Czech Republic, spruces are declining because of drought and honey fungus attacks and 50–60% (n = 635) of them are consequently infes...

Ngày tải lên: 07/08/2014, 03:22

... a greater spread of the values obtained, with the differentia- tion of Pinus Pinaster once again standing out. 3.2. Swelling strain Tables III and IV give the swelling strains in radial and tan- gential ... capa- ble of retaining the water molecules sorbed in molecular form, which are capable of linking to each other by means of hydro- gen bonds. This stage is exothermic, sinc...

Ngày tải lên: 08/08/2014, 00:21

... study in two nurseries of SE Spain. Two types of inoculum (spore suspension and mycelium inoculum) were used on 3 700 pine seedlings. The aim of the study was to ascertain the influence of two ... number of seed- lings for each pine-inoculum combination. (2) Percentage of ectomy- corrhizas observed in each root system for each pine-inoculum combination. These values were group...

Ngày tải lên: 08/08/2014, 01:21

... age was estimated by coring the base of a tree with an increment borer. Health of stands (indications of decline) and sil- vicultural management (uneven-aged stand or recent thinnings) were recorded ... essence 1. INTRODUCTION The development of human societies often has caused an overexploitation of forests and a decrease in their area. In France, the minimum of forest cove...

Ngày tải lên: 08/08/2014, 01:21

... a method of weighted averaging of the observed val- ues of a variable z within a neighbourhood V containing n points. In case of ordinary kriging, i.e. when no long-range ... of 300 points, covering the territory of the Czech Republic, employing kriging as an optimum spatial interpolation method. Cluster analysis based on allelic profile...

Ngày tải lên: 09/08/2014, 04:20

... during 1,440 minutes) Males Females Period of feeding/period of breaks in feeding (min) 52/1,388 252/1,188 (%) 3.6/96.4 17.5/82.5 Number of feeding stages (= number of stages of break in feeding) ... 36 Period of one stage of feeding (min) 3.5 7 Period of one stage of break in feeding (min) 94 34 Number of migrations from leaves to glass 69 16 Ditto (during one stag...

Ngày tải lên: 07/08/2014, 03:22

... less afflicted by air pollution, has been exposed to emissions to a certain extent; this, in spite of the fact that this load is currently in the form of deposits and not in the form of a high ... especially in FTG 6B. In this rich, spruce-beech for- est site type in the 6 th altitudinal vegetation zone, higher contents of magnesium, calcium, and zinc in needles w...

Ngày tải lên: 07/08/2014, 10:21

... decrease in cytokinin synthesis resulting from a reduction in root tip biomass in flooded seedlings. In fact, Dickson [10] underlined the involve- ment of cytokinin in bud break initiation of Quercus ... the ability of flooded seedlings to maintain nitrate reductase activity in roots despite low nitrate content in soil. In some species, nitrate reductase act...

Ngày tải lên: 08/08/2014, 00:22

... proportion of air spaces was also observed in late leaf samples harvested in early July on seedlings of treatments 2 and 4, but these differences were not observed in leaves ... harvested in mid- August. Chlorophyll content The chlorophyll content of early leaves was also influenced by the light conditions of year n (Fig. 1 For the 1...

Ngày tải lên: 09/08/2014, 04:20