Báo cáo lâm nghiệp: "Experimental weathering of mica by mycorrhizal and non-mycorrhizal beech and pine" ppsx

... transfor- mations of phlogopite were observed in Experimental weathering of mica by mycorrhizal and non -mycorrhizal beech and pine C. Leyval J. Berthelin Centre de P6dologie Biologique ... amounts of Mg, Fe and Al mobilized were also larger in pine lysime- ters than in beech lysimeters. Mycorrhizal beeches mobilized greater amounts of...

Ngày tải lên: 09/08/2014, 04:20

... the hyphae of the Hartig net. Hence, the aisturbance of the symbiotic equilibrium induced by girdling of the host plant leads to a change in the structure of the mycorrhiza and ... 1964; Heath and Heath, 1971; Littlefield and Bracker, 1972; Hohl and Stossel, 1976; Higgins and Lazarovits, 1978; Beakes et al., 1982) and are considered to...

Ngày tải lên: 09/08/2014, 04:20

... 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 ... the first half of June in 2006. e size of males and females is very similar. In total, pronotum width of males varied between 0.85 mm and 2.40 mm, and females be...

Ngày tải lên: 07/08/2014, 03:22

... production and nitrogen use in Scots pine stands in Eastern Finland. Forest Ecology and Management, 165: 317–326. INGERSLEV M., 1998. Vitalization of mature Norway spruce stands by fertilization and ... pine nee- dle chemical composition and its contents in most cases. e application of wood ash slightly increased P by 5%, K by 5–10% and Ca by about 10–30% in both...

Ngày tải lên: 07/08/2014, 03:22

... and Quercus petraea) and beech (Fagus sylvatica)arethemain species [30]. Since the plantation work of the Austrian admin- istration at the end of the 18th century, it is now composed of 74% beech ... Soil and vegetation treatments Four beech stands sharing comparable silvicultural characteristics were selected (Tab. I). Each stand had a different type of understory vegetati...

Ngày tải lên: 07/08/2014, 16:20

... account the percentage of gravels. Finally, predawn and midday water potentials were measured in Q. ilex trees during the summer of 2002 and 2003 by means of the Scholander pressure chamber. ... distance, depth and period. Comparison of mean values of θ were conducted by means of three-ways ANCO- VAs, with distance, depth, and season as independent variables, θ as depe...

Ngày tải lên: 07/08/2014, 16:21

... stumps and roots of dying and dead coniferous trees [2]. The adult pine weevil feeds on the bark of young seed- lings shortly after they have been planted and may cause the death of up to 80% of ... denotes the number of living seedlings (or number of living seedlings with herbivory) at the end of the experiments, and n is the number of planted seedlings at the begin-...

Ngày tải lên: 08/08/2014, 00:21

... organized in an incomplete block design and consisted of 8 pairs of released plots and competition- free plots, and 9 pairs of plots with competition and competition-free plots. The 10 cm-depth ... domain [28]. A mature stand of balsam fir – black spruce was clearcut in the summer of 1992 and the site was prepared by disk trenching in the fall of 1992. The soil of t...

Ngày tải lên: 08/08/2014, 01:21

... ’conser- vation of adaptedness’ and the concept of ’conservation of adaptability’. From a genetic point of view, two major arguments are of importance: on the one hand, the introgres- sion ... on electrophoretic studies of protein gene loci. The problems of this approach of estimating genetic structures of a population by elec- trophoretic...

Ngày tải lên: 08/08/2014, 18:21

... showing that A (Stupendick and Shepherd, 1980), gs and WP (Sands, 1984; Aussenac and El Nour, 1986) are affected by transplanting stress. However, the decline of A due to trans- planting ... not a consequence of re- duced gs, but was primarily determined by alterations of mesophyll photosynthesis. This, plus the parallel time course of A...

Ngày tải lên: 09/08/2014, 04:20