Báo cáo lâm nghiệp:"Below-ground resources limit seedling growth in forest understories but do not alter biomass distribution" doc

... was used in part as liquid with sand (25 cm 3 sand + 20 ml solution), in part reinforced by heating 6g of agar in a 1 l medium. Cultures were incubated for 6 weeks with a daily lighting period ... substances. White silica sand marked PR 21 from the sandpit Provodín near Česká Lípa (http://www.pisky.cz) was used in laboratories of the North-Bohemian Museum in Libere...

Ngày tải lên: 07/08/2014, 03:22

... that the fine root ratio is stable at least in the first growing period of new plantation and the best growing plants have about the same fine root ratio as the poorly growing ones. Even the regression ... explaining 92% of the relationship. An adequate proportion of fine roots (thinner than 2 mm) in the root system is another important parameter of p...

Ngày tải lên: 07/08/2014, 03:22

... m 3 /ha (according to Report on the Condition of Forests and Forestry in the Czech Republic, 2004). Timber felling In the whole post-war period, annual timber fell- ing in the forestry of Czech Republic ... some dynamic series of forest production and trends of forest economics in the Czech Republic V. K Faculty of Forestry and Woo...

Ngày tải lên: 07/08/2014, 03:22

... (1 n/N) ì 2 /n, independently of the original dis- tribution of the variable of interest. Here, although the estimate of the true mean is unbiased and the variance of the mean decreases ... samples of size 100, 32 of size 110, and 4 of size 121. In sampling a nonrectangular area, variability of the sample size will further be increased depend- ing on the...

Ngày tải lên: 07/08/2014, 03:22

... the Ministry of Agriculture of the Czech Republic, Research Project No. QG 50105. Production and humus form development in forest stands established on agricultural lands – Kostelec nad Černými ... composition). e study was performed in the stands of four tree species on afforested agricul- tural lands, in a neighbouring forest stand on con- tinuo...

Ngày tải lên: 07/08/2014, 03:22

... main tree species, the input data being the tree diameter and height, quality of the bottom third of the stem (A, B, C), stem damage (yes, no), and in the case of the beech also the age and ... for assessing the forest state – survey of natural conditions and forest ecology, detection of forest stands condition for forest management needs, and...

Ngày tải lên: 07/08/2014, 04:20

... volume of the log in m 3 , h – length of the log in m, g 1/2 – cross-sectional area at ẵ length of the log in m 2 . Total volume of coarse woody debris was given as a sum of the volumes of standing ... 2010 (9): 397–405 Coarse woody debris carbon stocks in natural spruce forests of Babia hora K. M 1,2 , J. M 1,2 1 Department of Fo...

Ngày tải lên: 07/08/2014, 10:21

... e application of A. cilicica, A. alba and A. nordmanniana resulted in 14% of germi- nating seedlings at least. Utilizing A. concolor, A. grandis and A. pinsapo lowered the germination rate ... 2009. 2009 In spring 2009 (beginning May 1 st ) pollination took place in two out of the four seed orchards (1 and 4).  e pollen of Abies fraseri was obtained from North Carol...

Ngày tải lên: 07/08/2014, 10:21

... data ob- tained in the areas of the Morava River floodplain in the area of Vrapač suggest that the development of the present ecosystems in the area in question began in the period of large-scale ... anthropogenic in uences that have over centu- ries led to the present state of the geobiocoenoses. Historical development of floodplain forests in...

Ngày tải lên: 07/08/2014, 10:21

... cycling (R, P 1999; C et al. 2001; C, N 2002; Characteristics of coarse woody debris in successional stages of natural beech (Fagus orientalis) forests of Northern ... origins of deadwood mate- rial in Aspen-dominated boreal forests. Applied Ecology, 7: 691–701. M M M.R. (1976): Some qualitative character of...

Ngày tải lên: 07/08/2014, 10:21

... di- amine putrescine (Put), triamine spermidine (Spd) and tetramine spermine (Spm). ere are a number of reports indicating that PAs play a crucial role in somatic embryo development including ... hurst ecotype of Norway spruce. Contents of free polyamines (putrescine, spermi- dine, and spermine) were determined in different developmental stages of Norway spruce somatic...

Ngày tải lên: 07/08/2014, 10:21

... 2006. Changes of the mixed mountain virgin forest after 70 years on a permanent plot in the Ukrainian Carpathians J. V, J. Š, T. K Department of Forest Botany, Dendrology and Geobiocenology, ... beech rotate. In 1934 the stage of disintegration probably pre- dominated in the plot, because total timber volume was rather low and na...

Ngày tải lên: 07/08/2014, 10:22

... Ann. For. Sci. 64 (2007) 781–786 Available online at: c  INRA, EDP Sciences, 2007 www.afs-journal.org DOI: 10.1051 /forest: 2007058 Original article A trait database for Guianan rain fore st trees ... Écologie des For ts de Guyane, Kourou, France (Received 11 November 2006; accepted 13 March 2007) Abstract – We present a plant trait database covering autecology for rain...

Ngày tải lên: 07/08/2014, 16:21

... article Below-ground resources limit seedling growth in forest understories but do not alter biomass distribution José-Luis MACHADO a,b *, Michael B. WALTERS a,c and Peter B. REICH a a Department of Forest Resources, ... of seedlings of five conifer species varying widely in shade tolerance to an increase in soil resources in shaded forest understories...

Ngày tải lên: 08/08/2014, 01:21

... article Interaction of initial seedling diameter, fertilization and weed control on Douglas-fir growth over the first four years after planting Robin ROSE*, J. Scott KETCHUM Vegetation Management ... positive responses to fertilization in the presence of weed control. Their results closely mirrored those of White and Newton [44], with a negativ...

Ngày tải lên: 08/08/2014, 01:21